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  • Quip to Black: Castle, on a regular basis. Nobody else is amused. Beckett also gets to play sometimes. Played with in "Swan Song" where both Esposito and Castle attempt to set up these situations for the camera crew following them. Castle even provides sound effect and musical cues. Esposito probably would have too but that would have ruined the surprise in the denouement where Esposito sings for real.
  • Qurac: Played with in the second season finale. Beckett swallows the existence of a threat to the Banking Minister of the Republic of Luvania even though she had never heard of the country before, until Castle points out that it doesn't exist.

  • Rabid Cop: Beckett in "Kill Shot" when interrogating a suspected sniper. Understandable since this happened right after she was shot.
    • Beckett also turns nasty in "Always", emphatically provoking the wife of a murdered gang member in trying to go after the sniper who shot her.
    • In "Murder, He Wrote", Ryan with a suspect when he understands that Beckett and Castle are dating.
    • Played with in "Reality Star Struck", where Castle and Gates get Beckett to act this way while interrogating the husband of a reality TV star.
    • Played straight in "Hunt" where Beckett kicks the seat from under a very uncooperative woman she's interrogating and lashes out to get her to talk.
    Beckett: Now, you don't talk to cops? Well, I'm not a cop today, honey.
  • Race Against the Clock: As the title indicates this happens in "Countdown". Partially subverted since the clock actually reaches 0, but Castle still manages to prevent the bomb from blowing up.
  • Rage Against the Reflection: Ryan smashes a mirror while staring at his reflection after a VIP is shot and killed on his watch in "At Close Range".
  • Reality Ensues:
    • In "Always", Beckett faces the man who shot her in hand-to hand. Despite her best efforts, she can't put a scratch on him, and he just beats the crap out of her without remorse. Because this isn't the kind of show where a woman who is still recovering from injury note  can beat an experienced martial artist and hitman who does this sort of thing for a living. Ryan even warns her the guy might be too much to handle, and she still pursues him even after he stuns her and knocks out Esposito, who is former Special Forces and an even better fighter than she is.
    • In "Watershed", Castle begins to accept the fact that Alexis has to move on with her life without him, even in spite of having nearly lost her in Paris. As if that wasn't enough for him to deal with, Beckett is offered a very prestigious job in Washington DC, which forces him to reconsider the state of their relationship.
    Castle: There comes a point in our lives when we have to stop fooling ourselves into thinking life's gonna be what we want it to be.
    • In the Season 4 premiere, Castle is promptly kicked out of the police department after the new boss comes in because he is a civilian. It's justified seeing as Castle is a writer, he shouldn't be able to get neck deep into virtually ANY police case. Heck, it's amazing that the police department gives him half the information he knows on any case, let alone let him venture into various investigations, even if he does help solve cases.
    • After he's banned from the precinct due to an inappropriate relationship with a mob family, Castle gets a PI licence so he can keep working with the team (it doesn't really work). When he tries following someone, he gets choked and maced in short order. However, Season 8 expands on the PI license by giving Castle two extra investigators in Alexis and new character Haley.
    • In Eye of the Beholder, Castle breaks an art installation and reveals a key piece of evidence in solving the murder. The museum still sends him a fairly hefty bill or the art piece.
    • Beckett's new job as a federal agent doesn't last long for the simple fact that someone as headstrong and used to relying on her gut as Kate just isn't a good fit for the tougher and more rules-bound world of the FBI. That's proven when she's told she has to be quiet on a case for "the bigger picture" which means possibly letting a killer go free. Unable to take that, Beckett drops an anonymous tip to the press which helps the NYPD solve the case. When her supervisor comes by, Beckett expects a mild reprimand or let off with a warning but instead is informed the Feds can't take someone who breaks their rules so openly and fires her on the spot.
  • Real Life Writes the Plot: In Seamus Dever's Episode Commentary for "Wrapped Up In Death", he says he broke his ankle three weeks before taping, encouraging the viewer to see how well he hides his limp. In the climax, the perp runs right past Ryan and Esposito, but instead of chasing after him, they just wave at him (the better to hide Dever's injury).
  • Really Gets Around: In the pilot, when Castle's mother says that he "never had a father figure" as an excuse for his misbehavior, his reply is that he had dozens of them. Castle himself has a lot of female groupies. Lampshaded by Esposito in "Suicide Squeeze" when he jokingly comments on how active Martha probably was during the 1970's. Probably a mistake to say this directly to Castle, however, who is less than amused.
  • Real Men Wear Pink: Slade was a theater major.
  • "Rear Window" Homage: In "The Lives of Others", Castle is so bored while recovering from a snowboarding accident, he starts watching his neighbors with binoculars. He sees what he's convinced is a man murdering his girlfriend with a knife, but neither he nor Beckett can find any hard evidence, so everyone except Castle is convinced he's just going crazy with boredom. Beckett even refers to it specifically as a "rear window scenario". Turns out Beckett staged the whole thing as a birthday present to Castle, and everyone, including the "murderer" and "victim", were in on the prank.
  • Recap Episode: "Still" has Beckett accidentally step on a pressure plate for a bomb, and Castle decides to stay with her for moral support. During which they discuss (and have flashbacks to) the way Kate keeps flirting with him and touching him "inappropriately", his own off-color remarks, her sexy outfits she keeps finding excuses to wear, who fell for who first...
  • Recurring Extra: Westside Wally (he prefers just "Westside") was in "The Blue Butterfly" as a squatter. For some reason, he was popular enough for someone to bring him back in "47 Seconds" as a witness to the bombing.
  • Recycled In SPACE: Jessica Fletcher as a hot middle-aged guy! Alternatively, Murder, She Wrote meets Moonlighting and/or Remington Steele. Except that, unlike in Murder, She Wrote, Castle isn't the killer. Or The Thin Man, only they're not married (yet) and she's the detective.
    • Given a full episode lampshade in "Murder, He Wrote".
  • Red Herring: Lampshaded.
    • One of the biggest happens in "Pandora"/"Linchpin". It happens twice: the two times they think they have found The Mole, it turns out that they are Red Herrings laid out by the real mole, Sophia Turner.
    • In the two-parter "Target" and "Hunt": In "Target" the daughter of an Egyptian partisan is kidnapped and Alexis is also a victim of the kidnapping. In the second part "Hunt" it is revealed that Alexis was the real target and the other girl was a target of opportunity to raise the profile of the case. It was a trap for Castle's father, a CIA operative, all along.
  • Redemption Equals Death: As revealed in the season 3 finale, Montgomery was the officer with McCallister and Raglan at the initial incident that led to Beckett's mother's murder. He dies killing Lockwood and his cronies.
  • Redemption in the Rain: Part of Beckett's epiphany in "Always" involves her brooding in the rain while sitting on a swingset. Word of God confirms that it's the same swingset she and Castle earlier had a meaningful discussion at in "Rise" (and where Castle would later propose to her in "Watershed").
  • Red Oni, Blue Oni: Esposito as Red and Ryan as Blue. Discussed in "Swan Song" where Ryan points out that while Esposito may be the muscle, he's the "nerve center".
  • Relationship Upgrade: As of the season 4 finale "Always", Castle and Beckett.
  • Remonstrating with a Gun: Castle in the season 3 premiere.
  • Replacement Scrappy: In-Universe, early in the sixth season, the replacement for Detective Kate Beckett, Detective Sullivan. Castle in particular doesn't like him.
  • Retirony: At the end of "Pretty Dead", Captain Montgomery's anniversary gift to his wife is his intention to retire from the force. Although it's waved off as typical Montgomery talk ("He retires every six months", Beckett says), he's dead by the end of the next episode, "Knockout".
  • The Reveal: Castle's birth name is finally dropped in "He's Dead, She's Dead". It's Richard Alexander Rodgers, which is incredibly amusing considering the daughter of a murdered psychic told Beckett that a man named Alexander would be very important to her...
    • In "Hunt" we meet Castle's father and discover he is a CIA operative, which is why he was never around.
  • Revealing Cover-Up: The most common way Castle and Beckett figure out whodunit.
  • Revisiting the Cold Case:
    • The murder of Kate Beckett's mother was a cold case and trying to find the truth motivated Kate to become a police officer. When Castle finds out about it, he tries to re-investigate the case, which causes Kate to become very angry with him. She has tried to solve the case many times over the years and each failure left her extremely bitter and depressed. Castle investigates anyway and a forensic expert he hires finds evidence that sheds new light on the case. Over the subsequent seasons, Castle and Beckett find evidence of a criminal conspiracy that the murder was part of and try to bring everyone responsible to justice.
    • Episode "That '70s Show": During construction a body is discovered inside a support column of a building. It is revealed to be that of a prominent mobster who disappeared during The '70s. The police always suspected that he was murdered but without a body they had no evidence to go on. Castle and Beckett reopen the case but the investigation is hindered by the fact that the main witness in the case had a mental breakdown and believes that he is still living in the '70s.
  • Right Behind Me: In "Smells Like Teen Spirit", while waiting for the principal of the school the Victim Of The Week attended Castle takes the opportunity to vent some grievances about the principal when he attended the school:
    Beckett: I bet that principal must have hated you.
    Castle: I'm wonder if 'hate' is a strong enough word; Principal Dunham had to hire a crane to get that cow off the roof. But I'm sure that old battle-axe has long since retired. Put out to pasture, so to speak.
    Dunham: [From behind] Is that a bovine reference, Mr. Rodgers?
    [Castle jumps up, startled]
    Castle: Principal Dunham. You're, uh... still here.
    Dunham: And sadly, you have returned.
  • Ripped from the Headlines: A frequent trope for this show, though happily not usually very anvilicious.
    • The plot of "The Late Shaft" has a lot of similarities to the Jay Leno/Conan O'Brien The Tonight Show controversy, as well as elements of David Letterman's affair scandal.
    • More disturbingly, the two-parter "Setup"/"Countdown", where homeland security current events like high-pressure interrogations, weapons of mass destruction, and racial profiling make their appearance.
    • Then, in "47 Seconds", an Occupy Wall Street clone stages a bombing, just in time for a failed attempted bombing by the OWS leaders in Cleveland.
  • Romantic False Lead:
    • Two of them in "The Third Man", each a date brought by Castle and Beckett to the same restaurant unawares. It lasts for all of 30 seconds before they're both making excuses to conspire about the case. Also a case of Pair the Spares because Beckett's date starts talking to Castle's date as Beckett and Castle leave the restaurant.
    • Detective Tom Demming for Beckett in season 2. He certainly provided a rude awakening for the Genre Savvy shippers who noted his tendencies and pegged him as the killer because he was the first one not of the main cast to talk to one of the main cast, and because he had connections to the victim. He wasn't. At the beginning of "Overkill", Alexis does some Leaning on the Fourth Wall, when Castle asks her to critique a portion of his next Nikki Heat book.
    • In the third season, Gina and Josh take these roles for Castle and Beckett respectively, but were mostly The Faceless throughout the first half of the series. After "Poof! You're Dead", Gina is out of the picture. And by the first half of "Rise" (the fourth season opener), Josh is too.)
    • In "The Limey", Castle hooks up with a flight attendant some time after hearing Kate say that she remembers everything that happened after she was shot. Colin, the British policeman, becomes this for Kate.
    • Eric Vaughn in "The Squab and the Quail" is another one for Kate... possibly giving her the first niggling doubts about her (now no longer hidden) relationship with Castle.
  • Room Full of Crazy:
    • There's one in the pilot, full of pages from Castle's books, and child-like crayon illustrations of the murders from the novels.
    • Scott Dunn from the season 2 two-parter "Tick, Tick, Tick..."/"Boom!" also has one, filled with pages from Heat Wave, detailing his obsession with the character and its inspiration.
    • "Linchpin" features a room full of strings and newspaper clippings, some of which depict hypothetical future headlines. The many disparate strings are tied together by a picture hung on the ceiling: that of a Chinese girl, the eponymous linchpin whom a mathematician theorizes that, if she is murdered by rogue CIA agents, would instigate a world war resulting in millions of American casualties.
    • Lampshaded by Castle, when he sees that Beckett keeps a wall full of crazy with the details of her mom's murder. She'd never shown it to anyone, even her boyfriend.
  • Rule of Cool: In "The Final Frontier," the murder weapon is a real-life Ray Gun.
  • Rule of Funny: In "Heartbreak Hotel," Castle, Esposito, and Ryan get thrown out of an Atlantic City hotel because they're out of their jurisdiction. Do they call the Atlantic City PD for help? No, they sneak in by dressing up in Elvis costumes. And it's hilarious.
  • Running Gag:
    • Very frequently will someone catch Beckett and Castle in a highly UST-charged relationship moment or situation and/or will allude to them being in a relationship, prompting Beckett and Castle to respond simultaneously — with completely different responses (usually with Beckett hotly denying it and Castle cheerfully confirming it). Often something along these lines:
      Ryan: Are we interrupting something?
      Beckett: No!
      Castle: [At the same time] Yes!
      [Beckett Death Glares Castle]
      Ryan: ... Okay.
    • A variation pops up in season five after Castle and Beckett's Relationship Upgrade; Castle and Beckett will either be flirting when the name of Person X (usually Ryan or Esposito, although Alexis has had at least one turn as well) happens to come up or vehemently insisting how it is vital that Person X doesn't find out their secret when, almost like magic, Person X will pop up behind them and say:
      Ryan/Esposito: What [about/shouldn't you tell] me?
      Castle and Beckett: {A bit too quickly) Nothing/Don't worry about it.
    • In the first couple of seasons, whenever Castle mentioned who he was and his previous character, Derrick Storm (who was killed off in his most recent book before meeting Beckett), the person he's talking to would immediately enthuse "Derrick Storm? I love that guy! Why'd you kill him?"
    • Castle's Grammar Nazi tendencies and minor Berserk Button over people misusing Irony.
    • Castle and Beckett completing each other's sentences, usually leading to a breakthrough in the case.
      Ryan: Don't they know that they are finishing each other's sentences?
    • Castle's more offbeat theories about the case of the week will almost inevitably involve the CIA at some point.
    • Castle has a tendency to get weepily emotional at significant or sentimental moments, particularly those involving the realization that his daughter is growing up. He also has a tendency, when pressed on whether he's crying, to come up with some lame excuse to cover them ("No, it's the onions!").
    • Ever since 'Lucky Stiff', whenever Castle has a favor he needs from Ryan and / or Esposito their response will usually be to demand to borrow his Ferrari in return. Each time, the lengths of time they want get longer.
    • When Ryan and Esposito split up to interview witnesses Esposito always gets the cute, flirty girls while Ryan gets the various strange and/or aggressive witnesses.
      • Inverted in "The Mistress Always Spanks Twice", where Ryan and Esposito are interviewing a few dominatrixes at their workplace. Ryan is seen ending an interview with two of them and everything is nice, civilized, formal, and — despite the fact that the dominatrixes are in their "work outfits", which doesn't seem to bother Ryan at all — not awkward at all. In the meantime, the sole dominatrix Esposito is interviewing is ordering him to untie the laces of her knee-high boots (to which he complies, even going down on his knees), slaps him with her riding crop a couple of times and verbally degrades him a bit when he's struggling to untie the knot, upon which Esposito becomes visibly nervous and ultimately fails.
        Ryan: [to kneeling Esposito] I see Detective Esposito has brought crime to its knees.

  • Sadistic Choice: In "Knockout", Lockwood comes to Captain Montgomery and demands that he lure Beckett into a trap so they can kill her or else he'll kill Montgomery's family. Being a noble and great man, he Takes a Third Option, sacrificing himself to kill Lockwood and his crew.
  • Safe Word: Castle's is "apples", as he repeatedly mentions to Beckett.
  • Salt and Pepper: Ryan and Esposito. Beckett and Lanie.
  • Samus Is a Girl: In "Heroes and Villains", the (original) Lone Vengeance.
  • Save the Villain: Beckett risked her life to save Sen. William Bracken, and the one who had Beckett's mother killed from a bomb because in that moment, he was under her protection. Castle tells the man later he would have let the villain die.
  • Saying Too Much:
    • In the pilot, the brother of one of the victims, when questioned for an alibi, helpfully provides alibis for all three of the murders. While Castle is downhearted, Beckett immediately pegs that while it's plausible he'd know his alibi for his sister's murder, the fact that he was instantly prepared for one for all three murders is more than a wee bit suspicious. Yep, he did it.
    • A non-murder example appears in "Time Will Tell", when Esposito mocks Castle's credulous reaction to the murder suspect's claims that he's a time traveller with a sarcastic reference to "Doctor Who's sonic screwdriver". Castle immediately points out that Esposito's familiarity with the show suggests that he watches it. Esposito is left looking rather cornered.
  • Scary Black Man: In "Law and Murder", the accused in a high-profile trial, as well as his friend. It later turns out both are innocent of the murder of one of the jurors.
    • This happens again when Beckett is investigating her mom's murder. She immediately keys in on Vulcan Simmons, who is happy to taunt and provoke her. She snaps and assaults him, which with no evidence against him gives him the leverage he needs to walk. Which of course was his intent.
  • Scary Minority Suspect: Several. Usually Wrongly Accused.
    • Most prominent is drug lord Vulcan Simmons, who had absolutely nothing to do with Beckett's mother's murder. He does, however, return in "In the Belly of the Beast" as the purported "Lazarus", thus blowing Beckett's cover and subjecting her to torture.
  • Screams Like a Little Girl:
    • In "The Third Man", Castle does one when he opens a refrigerator and an unexpected body falls out. Surprisingly, no one calls him out on it.
    • Also he does a small one in "Tick, Tick, Tick...", when Beckett opens the door for him with a gun in her hand, thinking it's the killer.
    • Parodied in the outtakes when Stana opens the file of a plastic-surgery patient and Nathan glances over at the picture before letting out a high-pitched, girly scream that startles the woman standing next to him and causes the rest of the set to crack up.
    • Invoked in "Cuffed" when Castle and Beckett are hanging from a pipe with the tiger below them. The plan to escape becomes "scream like little girls"—which, incidentally, is what catches the attention of Ryan and Esposito, who just happen to be nearby.
  • Screw the Rules, I Have Connections!:
    • A non-villainous example would be Castle himself, who has the mayor on speed dial and can thus convince the NYPD to let him shadow Kate around indefinitely.
      • Captain Montgomery ultimately subverts this in the season 3 finale. He later reveals to Beckett that he could have gotten rid of Castle at any time ("The mayor doesn't run this place, I do"), but only kept him around because he thought it would be good for her.
      • Also subverted by the fact that the mayor is not merely doing Castle a favor, but is using his fame as a bestselling author to improve the police's reputation... as well as his chances to get reelected.
    • Castle does the same thing in the pilot when he learns that the fingerprints normally take a week to process and also later, in "Fool Me Once", to learn if a dead body is a CIA agent.
    • By the second season, the NYPD has basically said "screw the rules, you're actually incredibly helpful," and after resolving that rather uncomfortable tension with Beckett in "Deep In Death," the two are getting along fine, though they still exchange plenty of wit and snark. So now Castle just keeps helping with the cases, ostensibly still under the guise of novel research, but more because both he and the NYPD like having him around. As of the end of the season 2 episode "When the Bough Breaks", he's on contract to write three more Nikki Heat books, meaning he's still fulfilling his original purpose.
    • In "The Third Man", Beckett does this to get into a high-end New York restaurant, surprising Castle, who didn't expect she had those kinds of connections. (He, of course, has plenty.)
    • In "Den of Thieves", Montgomery pulls a few strings to expedite a police report that could reveal a mole in a mob investigation from another precinct (which Esposito used to cover.)
    • Also, in "Kill the Messenger", Montgomery pulls more strings to smoke out a corrupted prison guard. Later subverted when a rich suspect threatens to call the police commissioner, Montgomery replies "Tell him I said hi. And that I could use a raise."
    • In "Setup", Castle offhandedly mentions that he's friends with the state governor in order to prevent Agent Fallon from kicking him off the case. Later subverted; when Fallon eventually does kick Castle (and Beckett) off the case he comments that he's asked the governor about Castle — and the governor's never even heard of him.
    • In "Rise", Castle uses this again on Captain Gates, Montgomery's successor. Raising the question of whether Montgomery could indeed have gotten rid of Castle if he wanted to or not.
      • Though it could also be Gates would rather keep her position by kowtowing to the mayor than lose it by doing something technically within her power, but...
    • More villainous when done by Senator Bracken, the Big Bad. He continually does this to thwart attempts to investigate him.
    • Castle tries, and fails, to do this to save himself from 3XK. Despite the support of the department, and even Captain Gates, the DA refuses to even keep him in holding— she insists that he be transferred to prison.
      • So, pulling strings of a different sort, Castle stages an escape.
      • Then gets the charges dropped on the escape.
    • In "Number One Fan" the chief of detective's current no-hire policy is the only thing keeping Gates from rehiring Beckett. After they finish the case and reunite a rich business man with the daughter he gave up for adoption years ago (and whose son-in-law just tried to frame her for murder), the business man, who is golfing buddies with the Chief of D's, puts a word out to help Kate get her job back.
  • Screw the Rules, I Have Money!: Castle has used his own money a few times to get around bureaucratic red tape:
    • In "Sucker Punch", when the NYPD balks at paying Dick Coonan's hitman's $100,000 charge for a hit, Castle ponies up the money himself.
    • In "Like Father, Like Daughter", Castle uses the offer of a generous donation for a school to get new science books to convince a secretary to check the files of the ones they currently have that stretch back to a murder 15 years prior he and Alexis are investigating.
    • Also inverted. Castle spends an entire episode lusting after a rare bottle of whiskey, but is disappointed when they find a room filled with bottles of it, since they're now evidence and off limits. Montgomery, however, says that the DA has decided these bottles are property of the city as they were owned by the mayor during Prohibition. So if Castle wants one, Montgomery mentions that Castle might be able to get his hands on one if he makes a donation to the NYPD Widows and Orphans Fund.
  • Second Love: Beckett for Castle. His first real love was Kyra Blaine, introduced in "A Rose For Everafter." It's entirely possible there's some more out there, as we don't know who else he dedicated his books to (not to mention his two ex-wives).
    • He gets another before-Beckett love in Sophia Turner in "Pandora" and "Linchpin". Too bad she's never really left her First Love: The USSR.
    • In "The Wild Rover" it's confirmed Jenny is Kevin Ryan's second love... though his first love was obtained while he was under an assumed identity while he was infiltrating an Irish gang.
  • Secret Keeper: In "Cops and Robbers", a priest plays Secret Keeper to the exact location of an abused wife who faked her and her son's death to hide from the powerful, and connected husband. Thankfully, the priest was more than willing to tell Kate and Castle the location of the two when he learns the abusive father has learned of them.
    • As of "Murder, He Wrote", Ryan now knows what's really going on between Beckett and Castle, but chooses not to tell Esposito about it, despite the latter being desperately curious about Beckett's new boyfriend.
    • In "After the Storm" Captain Gates invokes this when she tells Beckett she knows Beckett is keeping some secret about the dead Captain Montgomery and guesses it could smear the name of an otherwise good man. She informs Beckett she won't press the matter as she doesn't want to do that anymore than Beckett does.
    • In "Probable Cause", Ryan decides to tell Esposito to emphasize how high the stakes really are with Castle being arrested for murder. Beckett also heads straight to Lanie after Castle's arrest.
  • Secret Secret-Keeper: It's revealed in "Still" that of course Captain Gates knows about Beckett and Castle. What is she, blind?
  • Secret Test of Character: In the season 7 finale, "Hollander's Woods", Inspector Keith Kaufmann has Beckett show up at One Police Plaza for a performance review following her taking the Captain's exam, and immediately attacks her methods, her marriage to Castle and her being the inspiration for Nikki Heat. After Beckett's impassioned defense of all of the above, Kaufmann announces that the "performance review" was really an audition; they want Becket to run for New York State Senate, and had set up the fake performance review to see how she would respond under pressure.
  • Self-Insert Fic: What Castle essentially turns his narration of the Blue Butterfly case into, as he visualizes what the detective wrote, but overwrote relevant persons with himself and his friends. He even tries to get Ryan to say "Boyo" a few times (Ryan plays the role of an Irish thug in the narration), and flubs his narration and accidentally says Kate's name in place of Vera's (the detective's Love Interest).
    • The Nikki Heat series of novels is basically this.
    • And, we later realize, the Derrick Storm novels as well.
  • Self-Punishment Over Failure: In one episode, Alexis Castle grounds herself for a week after she jumps a subway turnstile without paying.
  • Sending Stuff to Save the Show: "One Life to Lose" has an in-universe inversion; a group of fans arrange to mail in axes as part of a campaign to get a soap opera's head writer fired.
  • Serial Killings, Specific Target: In the pilot, the killer murders his sister for her money, then stages the murder to look like something out of one of Castle's books and commits two similar murders so it'll look like one of her clients — who's obsessed with the books — did it.
    • The plot is revisited when a crazy obsessive is arrested for plotting Senator Bracken's assassination. Castle uncharacteristically tells Beckett that it's open-and-shut and to let it go. Considering that Castle never thinks this way, the allusion is likely intentional and an indication that Castle was actually trying to let Bracken die— something he later admits to Bracken he would have done if he'd had the chance.
    • This trope is also followed in "Scared to Death".
  • Series Fauxnale: The Season 7 finale "Hollander's Woods" doesn't end on a Cliffhanger like most other season finales do. This is primarily because at the time of writing and filming, the show's possible Season 8 renewal was still up in the air. So, instead the episode ends with an And the Adventure Continues note (everyone leaves to investigate a new murder, after Castle receives a literature award). It's also interesting that the final scene is one of very few instances in which all the main cast members are present in the same scene (even Captain Gates is there!), as well as two supporting characters, Ryan's wife Jenny, and the tech cyber expert Tori. There was also some question as to if Stana Katic would return even if the show was renewed, thus the side plot of Kate questioning whether she should take an offer to become a state senator, which is clearly the writers setting up a Put on a Bus situation. Thankfully, Katic signed on for a Season 8, once the show was officially renewed.
    • Coincidentally, the Season 8 finale, had the show been renewed, would have ended on another Cliffhanger. When it got canceled (after an announcement that Stana Katic would not be back for Season 9 anyway), the producers tacked on a Babies Ever After ending.
  • Serious Business: In "A Deadly Affair" the entire precinct seems pissed off that Castle didn't call them at all during the summer off — Esposito said he should've let Ryan shoot him when they caught Castle in a murder victim's apartment or at least locked him up out of spite because of it. Montgomery offers to do just that.
    • It's less that he didn't call them and more that he didn't call Beckett, who was hurt by it and had just dumped her boyfriend to be with him (unbeknownst to Castle, though, who had finally given up).
    • In Law And Boarder Scrabble becomes Serious Business for Castle, especially after Beckett beat him. Before then Castle had been essentially undefeated in the game, prompting much teasing from Martha and Alexis.
      Castle: "Richard Castle. One Word Short." I cannot allow that to become my epitaph. (Beckett and Alexis fist-bump each other) I saw that.
  • Sex with the Ex: In "Always Buy Retail", Castle sleeps with his first ex-wife when she rolls into town for a short time. He compares it to the guilty pleasure of a "deep fried Twinkie". More seriously he re-kindles a romance with his second ex-wife in the season 2 finale when he thinks Beckett is serious with Demming.
  • Sexless Marriage: A profiler accuses Beckett of sleeping with Castle and they both deny it, Castle mentioning:
    Castle: No, she's right. Aside from my second wife, this is the most sexless relationship I've ever been in.
  • Sexy Soaked Shirt: In the season six episode "In the Belly of the Beast", Beckett is waterboarded by criminals after her cover is blown. The water makes her already tight, black sweater so clingy that she might as well be wearing body paint (though it stays opaque and she's wearing a bra underneath). Given the context, the scene is played not so much for Fanservice as to accentuate her vulnerability by, in effect, removing a layer of protection.
  • Sexy Surfacing Shot: "To Love and Die in L.A." has a scene with Kate emerging from the pool in Slow Motion to get the attention of the Villain of the Week, though the undercover Castle also gets Distracted by the Sexy.
  • Shameless Fanservice Guy: In "The Limey", Detective Colin Hunt isn't fazed when his Modesty Towel falls down in front of Beckett and Castle.
  • Shared Universe:
    • Richard Castle apparently exists in the universe for Missing, another ABC show.
      • Which is made odd by the episode "Hunt." When Alexis is kidnapped Esposito makes references to the movie Taken as well as the show Missing.
    • The show also mentions Hudson University, which links it to several shows from different networks.
    • As does the New York Ledger.
    • The show takes place at New York City's twelfth precinct.
  • Sharp-Dressed Man: Castle has some really nice suits. Ryan also has a penchant for wearing three-piece suits to work. This was lampshaded when Ryan went undercover in "The Wild Rover", as the three-piece suit was a sign he wasn't undercover anymore.
  • She Cleans Up Nicely: Beckett in several episodes ("Home Is Where The Heart Stops", "When The Bough Breaks", "The Third Man", "The Final Nail", "The Limey"). Said literally to her, too.
    • This trope also applies to Lanie in "The Double-Down", "Reality Star Struck", "The Blue Butterfly" and many other episodes. "Quit looking at the girls, Castle!"
  • Sheep in Sheep's Clothing: Detective Demming was introduced as a Nice Guy, then came under suspicion by the team that he was a Dirty Cop and the Killer of the Week. Turned out that not only did he have an alibi, it consisted of coaching an underprivileged youth basketball league.
  • She Is Back: in "Rise", after having suffered a Heroic BSoD when a suspect pointed a gun at her, Beckett has to face the actual killer, who is pointing a shotgun at her. She seems to be on the throes of a BSOD again, but Castle talks her down and she manages to pull through.
  • She Is Not My Girlfriend:
    • Brought to a head in "The Third Man" thanks to a newspaper article saying they're romantically involved.
    • "Kill the Messenger." Goes approximately like this:
      Beckett: No.
      Castle: [Simultaneously] Not yet.
      Beckett: *glare*
    • Comes up again in "Cops and Robbers," this time said word for word.
    • Later, in "Cloudy, With a Chance for Murder", they're denying a relationship that has finally been kindled, to avoid NYPD rules.
  • Sherlock Scan: Castle pulls this on Beckett in the pilot, as a sort of attempted Let's Get Dangerous! moment to prove that he can actually help. It's played with in that Castle realizes as he's doing it that he's hurting Beckett and digging up painful memories for her, and apologetically stops without taking any satisfaction in being correct.
  • Shipping: Beckett gives a dictionary definition In-Universe of this in "One Life to Lose" along with the Portmanteau Couple Name of "Fox Can." The first suspect was also suffering a bad case of Die for Our Ship for "Can Fonso."
    • In the same episode, Castle works out the Portmanteau Couple Name for Esposito and Lanie, "Esplanie". "Which is perfect, because they're always esplaining things!" Shippers for these two have used the term ever since.
    • They later use the Official Fandom term Caskett in the series to refer to themselves. This is after Castle made the suggestions "Ric-kate" and "Kate-ick", which Beckett rejected. (The last one is Stana Katic's surname).
    • Perlmutter/Lanie shippers, sadly, have yet to hear "Perlanie" used on screen, despite the fact that the two actually get along when they're both on together. *cry*
  • Ship Tease: The entire point of the scene where Castle and Beckett kiss in "Knockdown". Well, that and to have a guard let down his guard long enough for Beckett to pwn him.
    • Find an episode that doesn't tease Castle and Beckett. Go ahead. We'll wait.
    • The episode "Cuffed" is one big Ship Tease, from the first scene where Castle and Beckett wake up with their left hands cuffed together, to the last scene, where Beckett hints at wanting to be cuffed to Castle again.
    • Possibly the most blatant Ship Tease so far was Ryan's wedding in "Till Death Do Us Part", where the show closes with Castle and Beckett walking down the aisle, hand in hand.
    • "An Embarrassment Of Bitches" unexpectedly teases Esposito and Kay Cappuccio, but that never goes anywhere.
    • "The Blue Butterfly" requires clearance from the US Dept of Customs to watch, there's so much shipping going on there.
  • Shipper on Deck: Lanie is the most obvious, but close behind her are Ryan, Esposito, Alexis, Martha, Montgomery... hell, it'd be easier to list who doesn't ship Castle and Beckett during the course of the show. Such as Gates. Notably, however, Kyra Blaine, Castle's first love, is also this. She pretty much explicitly gives Beckett her permission-slash-blessing!
    • And then, when beta (or gamma) offscreen couple Esplanie is revealed, everyone else is fully in favor.
    • There are even hints that Gates, despite hating Castle and officially not knowing about the romance between the two, might be quietly looking the other way. This is explicitly confirmed in "Still", when Gates rather exasperatedly tells the just-saved-from-a-bomb Beckett to go ahead and kiss Castle, already.
  • Shoo the Dog: Beckett tries this with Castle to protect him from LocSat in Season 8. It doesn't work.
  • Shoulders-Up Nudity: "Murder, He Wrote": At the start of the episode, Beckett Dress Hits Floor when preparing for a Two-Person Pool Party with Castle. We only get a short of her bare shoulders up and of her bare legs, with a brief Toplessness from the Back shot.
  • Shout-Out: Has its own sub-page. See ShoutOut.Castle.
  • Show Within a Show:
    • "The Late Shaft" — Bobby Mann Live is a mashup of the Letterman/Leno/O'Brien/Fallon late night TV shows, where the host Bobby Mann (played by Tom Bergeron) is the Victim of the Week
    • "One Life to Lose" — Temptation Lane is a shoutout to daytime soaps.
    • "Nebula 9" — A Shout-Out to Firefly (due to its short life and cult following) as well as Star Trek and Battlestar Galactica (1978).
  • Shower Scene: Beckett gets one in "Tick, Tick, Tick". The scene has many variants of the trope; the shower silhouette, the in-shower cam, the leg washing, the stepping into a towel, etc. It gets hot.
  • Shown Their Work:
    • Castle researches the material in his books before he writes them so as to present an accurate depiction of the subject matter. However that doesn't stop him from taking Artistic License with certain subjects.
    • In "Always Buy Retail", Castle brings in an expert on Voodoo he'd used in his books. She explains that voodoo is a serious religion, and that Castle had sensationalized it with gratuitous sex imagery.
    • In one episode, a killer was said to have been synthesizing cyclonite (a.k.a. RDX) from formaldehyde. While formaldehyde is not directly used in the synthesis, it is used in the manufacture of the reagents used in the synthesis. A sort of pre-precursor if you will. It was pleasantly surprising that the writers bothered to give a plausible method.
    • In "Wrapped Up In Death", the producers used a bio lab tech to show that they know what Carbon-14 dating is (unlike some other shows), and why it would work on mummies...and why it wouldn't work with the mummy in question. It's only a 4-month-old mummy.
    • In "The Late Shaft," Lanie gets a chance to explain MAO Inhibitors, and that you shouldn't take anything fermented with it (especially not balsamic vinegar).
    • In the season 2 finale, a bullet fragment is said to have been fired through a polygonal rifled barrel, such as those found in Glocks. Not only would it actually be possible to discern that from a bullet fragment, Glocks actually are one of the most common handguns to use polygonal rifling.
    • In "Punked" the writers managed to accurately portray Steampunk, actually contracting many professional Steampunk costumers for the club scene and having Castle deliver a very accurate summation of the philosophy of the subculture. This was especially rewarding after the poorly researched equivalent in NCIS: Los Angeles.
    • "Last Call" gives us a pretty detailed history of New York during Prohibition, where there were a lot of speakeasies, supposedly because Mayor Jimmy Walker was an opponent of Prohibition.
    • Sadly, not used in "Undead Again", where the drug scopolamine's effects are totally mis-stated. It can be used by criminals asa date rape drug or to aid in robbery, but it doesn't turn you into a brainwashable zombie.
    • The fifth season episode, "The Fast and the Furriest" was right about chimps. Full grown chimps are stronger than world-class weightlifters and are territorial and aggressive.
  • Single Tear: Ryan is the only one crying when they meet in "Knockout", after Captain Montgomery's death. A perfect single tear rolls down his face.
  • Sleep Cute:
    • The episode "Close Encounters of the Murderous Kind" has Rick Castle and Detective Beckett wake up in her police car after they were taken, interrogated then drugged by mysterious government agents. Later they are asked "Are those hickeys?" "I wish... They're from the injectors" he answers.
    • At the very beginning of "Cuffed", before they realize that they were—yet again—kidnapped and drugged.
  • Sliding Scale of Idealism vs. Cynicism: Castle's generally a lighthearted optimist who's more willing to see the best in people, where Beckett's more of a hardened cynic who's more inclined to think the worst. Both have had their belief systems challenged, but the series seems to be leading to Beckett gradually warming to Castle's viewpoint of the world more than vice-versa.
    • As of the sixth season, the show seems to be leaning a bit toward cynicism, as Beckett begins to realize that her job usually involves a lot of morally grey areas, as opposed to her black-and-white world back when she was a detective.
  • Slut-Shaming: A rare male example. Beckett is happy to shame the show's resident slut, Castle, who shrugs it off with good grace. See also: Urban Legend Love Life.
    • In a fourth season episode, the victim is a pick-up artist. Although everyone attacks his and his friends' sleazy tactics, they also all insult the women who fall for them.
      Ryan: This impresses you? These women are pathetic for falling for this guy, and Bailey? Bailey was just a con man and a liar.
      Beckett: Thank you. At least there is one real man amongst us.
  • Smoke Out: In "Poof, You're Dead," a street magician (played by Chadwick Boseman) does this. Castle is amazed, while Beckett just rolls her eyes and pulls the magician out of the small stage he had ducked into.
    Beckett: Alakazam, jackass.
  • Smuggling with Dolls: The team realizes that their Body of the Week hid evidence inside a collectible doll they found when Castle bought the contents of her storage unit at auction and gifted to Captain Gates. Cue Castle bursting into Gates's office and smashing the doll... and finding nothing, because it was Gates's doll that she brought from home. So he smashes the other doll, too, and finds a USB drive.
  • Smug Snake:
    • The killer, Scott Dunn, in "Tick... Tick... Tick.../Boom!" — he clearly wants to be a Magnificent Bastard and spends most of the two-part episode one step ahead of the police and the FBI, but this is more than balanced out by his tendency towards Villainous Breakdowns whenever things go against him and his general slimy, arrogant know-it-all demeanour.
    • Simmons, the drug lord Beckett brings in to ask about her mother's murderer in "Knockdown". He actually gets her angry enough to throw him against the interrogation mirror and cracks the hell out of it, not to mention nearly goading Castle to a fistfight.
    • The little bastard from "Hedge Fund Homeboys". Both Castle and Beckett really, really want to take that punk down.
    • The prime suspect in "Undead Again" even wants to fill up a comment card for the level of service he received while being held inside the precinct.
  • Sniff Sniff Nom: In "Murder Most Fowl" Castle finds a feather in the victims pocket, sniffs it, licks it and then declares that it's from a bird of prey. He also concludes that therefore, the man must have been killed by the nefarious "Falcon Killer".
    Castle: Struck down by a killer with the speed and cunning of a bird of prey.
    Everyone else: [incredulous look]
    Beckett: Don't Ask.
  • Something Else Also Rises: In the beginning of "The Human Factor" Castle is using a camera on an RC tank toy to peep at Beckett while she's in her undies. He makes the tank's main cannon rise along with the camera.
  • Sorting Algorithm of Mortality: Lampshaded by Ryan to Esposito in "Under The Gun" who comments that because Esposito is snarky and Hispanic, he'll definitely die first. Castle tries to lampshade it but Beckett cuts him off.
  • Soundtrack Dissonance: In quite a few intros where the camera pans down to a corpse, relatively light music can be heard playing the background. Especially dissonant in the intro to "Home is Where the Heart Stops" with that cheery little pop playing as the camera slowly pans to the body.
  • Spanner in the Works: several times, of course, but Castle holds the record on this. Of note are the pilot (Beckett would have stopped researching if Castle had not insisted on several inaccuracies in the murder scenes) and "Cops and Robbers" (had Castle not been talking to Beckett when the hold-up started, the cops would have arrived too late to prevent the robbers and the man who hired him from finding what they wanted and escape).
    • Particularly important is the 3xK, who tells Castle at a later episode that the only reason he was not able to continue killing was that Castle managed to figure him out.
  • Special Edition Title: "Countdown"'s title sequence is simply the logo, unanimated and tinted blue, to prevent Mood Whiplash.
    • "Kick the Ballistics" has the logo in normal colors, but no cheery music, again to prevent whiplash.
    • "Demons" has a Halloween special version of the intro, with the piano music played via Ominous Pipe Organ and wolves howling.
    • "The Blue Butterfly" has the tune played in sax, jazz style.
    • "Always" has the logo in slightly greener tones, without cheery music.
    • "Swan Song" features a rock version of the theme tune.
    • "Secret Santa" gives us a Christmas-themed version, not unlike the Home Alone title music.
    • The title sequence in the 100th episode "The Lives of Others" has a few "100"s mixed in.
  • Special Guest:
    • Joe Torre, a baseball player and manager, who appears in "Suicide Squeeze". Castle is fairly nonchalant, having met Joe before and not being overly interested in the game anyway, but Beckett can barely keep from Squeeing and immediately rushes off to call her dad to gloat.
    • Chef Rocco Dispirito appeared in "Food to Die For" during Castle's date with Beckett's high school BFF.
    • Gene Simmons shows up in "To Love and Die in LA" as a friend of Mike Royce's.
    • Castle calls Wes Craven in "Scared to Death" for help on a scary case.
  • Spit Take: In Nikki Heat, Beckett sprays her coffee in reaction to Natalie's question "Is Castle gay?"
  • Spoiler Opening: Averted in "Probable Cause". Since most astute Castle viewers know that actor Michael Moseley plays Jerry Tyson, AKA 3XK, that particular credit is not in the normal opening guest credits.
    • The same can't be said for "In the Belly of the Beast", which has both Jonathan Adams (Vulcan Simmons) and Jack Coleman (Senator Bracken) in the opening credits. Subverted in Bracken's case, as other than a video of him announcing his presidential bid, he does not appear.
    • "Veritas" does a Previously On… that sets up that this is a Beckett's Mother arc episode, so the opening credits having both Adams and Coleman isn't a shock. What is a shock is one credit they purposely left out: Reuben Santiago-Hudson, who reprises Captain Montgomery in a flashback to when he and Beckett first met (as he alluded to in "Knockout").
  • Spoiler Title: The first season episode Hell Hath No Fury. While the wife was involved and the motive was the husband's affair, she is not the murderer herself.
  • Spousal Privilege: In "Den of Thieves", they interview the wife of Esposito's allegedly-Dead Partner, whom they suspect of the murder. She points out that either he's really dead, in which case he didn't do it, or he's not, in which case they're still married and she can't be compelled to testify against him.
  • Squee!: What Beckett tries (and partially succeeds) at holding in when she meets "Joe Frickin' Torre" in "Suicide Squeeze".
    Beckett: I gotta call my dad! [disappears offscreen]
  • Stable Time Loop: Implied in the episode, "Time Will Tell," an episode where a Simon Doyle claims to be from the future. A main piece of evidence has a coffee stain on it. An exact copy of that evidence also falls into police hands. At the end of the episode, Beckett spills coffee on the clean sheet. The coffee stain exactly matches the stain on the first sheet they found.
  • Stab the Scorpion: A double Stab the Scorpion. In "A Deadly Affair," Beckett and Castle are facing each other, both apparently pointing guns at the other. They fire simultaneously, and both hit a bad guy that was sneaking up to take the other unawares.
  • Stalker Shrine:
    • Castle's obsessive fan in "Flowers For Your Grave" possesses one of these, which goes a long way towards putting the nails in his coffin when it comes to his guilt. Subverted, in that he actually didn't do it.
    • Beckett Nikki Heat's obsessive fan in "Boom!" has one as well, complete with creepy Beckett Heat collage and manuscripts about killing Beckett Heat.
    • In "Inventing the Girl" the victim's stalker does not have one of those, since he was not an actual obsessive stalker, but just pretending, in order to scare the victim into dropping out of the competition.
    • Another stalker has one in "Limelight"...and he actually knew his charge well enough that he could tell her apart from her double. He didn't do anything to her, but was trying to warn her that her life might be in danger.
  • Starter Marriage: In an episode, this is the case for one of the suspects and his ex-wife, which he doesn't remember because he gained amnesia at the time of the murder. At the end of the story, they've decided to give it a second chance.
  • Start to Corpse:
    • Zero in season 1 (the first shot of each episode was the corpse); not too much longer after (with a Law & Order cold open to start each episode.)
    • Slightly extended in "Wrapped Up in Death," the first Castle episode to show the victim shortly before his murder actually being murdered by a sawed-off gargoyle head, then cut away to Castle's home antics, then back to the crime scene.
    • Extended a bit longer in "The Late Shaft", wherein the opening is Rick Castle going on a late night talk show, then the next morning finding out the host is dead. In fact, it's ruled natural causes at first, but the host told Castle that someone was trying to kill him the night before, so he insisted Lanie take a look at it.
    • Season 5 episodes have extended this, often showing the murder or the events leading up to the murder before the main characters make their appearance.
  • Status Quo Is God: Every so often, Captain Gates will start warming to Castle slightly, or they will discover some mutual interest or commonality. If this happens, expect something to happen in order to crush this budding friendship and leave Gates, if possible, hating Castle even more than she did previously.
    • The start of season six puts the divinity of status quo to the most strenuous test. Beckett and Castle are engaged and she just got a job with the US Attorney's office in Washington D.C. It takes three episodes for Beckett to lose that job, and one more before she gets her old one back. The engagement's still on, thank god.
  • Stealth Hi/Bye:
    • "Home is Where The Heart Stops" Powell pulls one while standing about a foot away from Castle. Spoilered not to ruin the awesome.
    • In "Fool Me Once", the scary CIA agent does the same.
    • In "Knockout", Castle does this to Beckett on request from Montgomery.
    • In "Scared to Death", a motel owner does this to Beckett and Esposito. Hilariously, Esposito is startled and backs against a wall.
  • Stealth Pun:
    • Castle's most popular character is Derrick Storm. As in Storming the Castle.
    • When investigating the bathroom of someone suspected of adultery, Castle comes across a package of "Cheetah Condoms".
  • Steampunk: Castle and Beckett visit a Steampunk club in Season 3's "Punked". And it's awesome.
  • Strange Minds Think Alike: In "At Close Range," Ryan texts Castle when he thinks the prime suspect isn't the killer, as Castle would be the best person to help him. The two are at the crime scene, setting up shooting targets and laser lights, when Beckett finds them.
    Castle: Ah, well, Ryan was working all night and he texted me.
    Beckett: You texted Castle and not me?
    Ryan: Well, when you have a crazy theory, you don't call the voice of reason.
  • "Strangers on a Train"-Plot Murder: "The Double Down." Both the movie and the original book are referenced. In this case, the strangers were on a boat.
  • Strictly Professional Relationship: This is one of the roadblocks to the romantic relationship of Detective Kate Beckett from New York Police Department and Rick Castle, a writer who is allowed to tag along in her investigations in order to gain inspiration for his new novels. Don't worry, they get their Office Romance and Relationship Upgrade.
  • Strip Poker: The 6th season episode "Law and Boarder" ends with Castle and Beckett playing strip poker. At the end, Becket is down to her bra and Castle is wearing a shirt which he says is the last thing he's got left to bet (we only see them from the waist up). Both players go all-in, but don't even bother seeing their cards or taking off their last garments - instead they start making out, and we cut to the end credits.
  • Superstition Episode: In the episode "Wrapped Up In Death", Castle becomes convinced he's been cursed by a Mayan mummy from a museum exhibit after he opens its sarcophagus and looks upon its face. The precinct razzes him about it (removing bolts from his chair so it collapses, then having the bomb squad rig the coffee maker to spew steam at him), but when the elevator stops working with Castle inside it, they tell him even they're not that cruel. He gets the curse lifted somehow by the end of the episode ... then cuts himself with a bread knife.
    Castle: What's the difference between "curse" and "clumsy"?
  • Supporting Protagonist: Despite being the eponymous character, Castle is clearly this to Beckett. Looking at the tropes, he is the zany sidekick and she is the hardboiled detective who'd be the star of any other show. And the Sherlock Holmes comparisons abound: Castle finds Beckett, realises that she's a brilliant detective, all but attaches himself to her hip and then writes about their adventures in crime-solving.
    • However, the show operates on two levels. In addition to crime-fighting, the relentless UST between Castle and Beckett also prompts major character development from Castle. Even as he's the plucky sidekick in the cases, he's the main character in his transformation from playboy to heroic figure.
  • Sure, Let's Go with That: Seemingly played straight in "A Rose For Everafter" where Beckett accuses Castle of messing with her chair while Castle thinks she's talking about him seeing the suspect behind her back. Castle thinks he's in the clear when Beckett shows that she knows about that too.
    • In "Swan Song", Gates calls Castle and Beckett into her office, where they think she's gonna tear them a new one about their relationship being caught on camera by the documentary crew that followed them around all episode. Turns out she's gonna tear them a new one for photobombing her very serious mug for the documentary camera.
    • Happens again in "Reality Star Struck" between Castle and Gates, when in an attempt to surprise Beckett with his Valentine's gift to her, he accidentally slips it into Gates's blazer instead. Thankfully for Castle, the note he leaves inside the gift box doesn't mention Kate by name, so Castle easily agrees with what Gates thinks is a practical joke at her expense.
  • Surgical Impersonation:
    • In "Disciple", a plastic surgeon makes random people become the spitting images of Lanie and Esposito (Lanie right down to her tattoo in an intimate place; Esposito's doppelganger also takes voice lessons to get him down pat) to facilitate the theft of all the files on 3XK. The plastic surgeon who did them up is 3XK's titular disciple.
    • Used in a (somewhat) less sinister way in another episode: the investigation reveals that their victim is not the party-girl heiress they thought, but rather an (almost) Identical Stranger the heiress had come across a few years earlier. The heiress payed for the surgeries that would make the stranger her exact double, then hired her to take care of things the heiress didn't want to do (like court-ordered community service). After the heiress died, the double took over her identity.
  • Suspiciously Clean Criminal Record: Shows up often on the show. One notable example is when investigating the torture and subsequent murder of a surgeon. Ryan and Esposito are discussing how unusual it is for that to happen, given that the surgeon had no criminal record and no connections to any mobs. Ryan goes so far as to mention, "The guy didn't even have any porn on his computer".
  • Switched at Birth: The ending to "When the Bough Breaks." And it's a Tear Jerker.

  • Tag Along Author:
    • The premise of the show, with Castle shadowing Beckett for research and inspiration for his Nikki Heat novels.
    • Also invoked in-universe with an actual actor when Natalie Rhodes spends a case shadowing Beckett in "Nikki Heat".
    • Invoked again, when writer Alex Conrad (Castle's protege) starts meeting with Beckett in "The Dead Pool".
    • And yet again, in "Heroes and Villains", when Paul Whittaker turns out to be a journalist shadowing costumed superhero Lone Vengeance. Except that he's also her lover.
    • Averted in "Ghosts". Ghostwriter Lee Wax tried to arrange an all-access pass with Castle. But when Castle figured out that Lee Wax had intentionally leaked the identity of the subject of her book, hoping that her arrest would be good PR for her book and give her artistic freedom to write it her way, her all-access pass was revoked. And to add insult to injury:
      Castle: Oh, and one more thing; one day, and one day not very far from now, I'm gonna use this in a book.
  • Tagalong Kid: Sometimes Alexis. She's smart and mature and all that, but still unquestionably a kid. And on those occasions when she shows up at the precinct, everyone's on their best behavior.
    • In the latter half of Season 4, starting with "Pandora", she interns for Lanie, and participates at times whenever the cops require Lanie's expertise.
  • Tagline: In-universe example in the episode "The Late Shaft", Castle decides he and Beckett need one. He first tries "She's armed, he's dangerous" without success, then...
    Castle: How about: "A whole new chapter in crime-solving". "Chapter", get it?
    Beckett: Ooh! ... No.
    • The second was the tagline on the Season 1 DVD set, while the first would become Season 2's DVD tagline.
  • Take a Third Option: A dog, of all things, gets to do this in "An Embarrassment of Bitches" when, given the choice of living with Castle or Beckett, who have been sharing responsibility of taking care of him, he instead chooses to live with Kay Capuccio, much to their mutual disappointment.
  • Take My Hand: In "Always": Ryan, with a bunch of police officers, rescues Beckett just as her hand slips from the roof of the building she was hanging off of... while a scowling Gates looks on, ready to rip Beckett a new one.
  • Take That!:
    • In "Little Girl Lost", we have this exchange between Beckett's ex-boyfriend and Castle.
      Sorenson: Why the sudden need to shadow a real detective ?
      Castle: Well the ones on TV seem mighty fixated on their sunglasses.
    • In the episode "Wrapped up in Death" an archaeologist at a museum is killed and an ancient Mayan mummy curse is blamed. Not much later this happens:
      Castle: This guy is like Indiana Jones but with space age technology. Oh, which would have been such a better movie than that last one.
    • In "Sucker Punch", Beckett mentions that the Captain's post-incident evaluation where they confront the guy who killed her mom has Castle come off like Steven Seagal.
      Castle: Should I be flattered or insulted?
      Beckett: [chuckle] Both.
    • From "Tick Tick Tick..." Beckett is upset while dealing with a killer who was inspired by Nikki Heat, and Castle consoles her:
      "A very wise woman once told me, 'You can't blame Jodie Foster for John Hinkley.' But you can blame her for Nim's Island."
    • From "Target":
      Beckett: Why would he shoot at the van?
      Castle: Maybe Jack Bauer was driving.
  • Taking You with Me: How Captain Montgomery ends season three.
  • Tampering with Food and Drink:
    • In "The Late Shaft", the Victim of the Week is killed when the murderer spikes his cranberry juice with balsamic vinegar, which has a fatal interaction with his medication.
    • In "The Squab and the Quail", the Victim of the Week is killed by poison sprayed upon an appetizer in an exclusive restaurant.
  • Tempting Fate: A hilarious one in the pilot, no less. Castle is talking to Alexis, telling her he wishes for someone to come to him and say something new. When Beckett appears and tells him she wants to question him about the killings by someone who is making his killings look like Castle's books, Alexis lampshades the whole thing.
  • 10-Minute Retirement: "Sucker Punch", of a sort; when Beckett discovers that the murderer of the week was the same person who killed her mother, pretty much her first impulse is to flee the station.
    • At the end of "After the Storm", Beckett is reinstated by Gates, but still has to serve her suspension along with Esposito.
  • Ten Paces and Turn: "Punked". This conveniently covers up the circumstances behind what really killed the episode's victim.
  • That Came Out Wrong:
    • In "One Man's Treasure:"
      Castle: (to Beckett after an interrogation) "It was pretty cool the way you filled in the story there. I think I must be rubbing off on you." (Beat) "That sounded dirtier than I meant it."
    • This brief pip from "The Final Nail":
      Castle: Do I see two men jumping on a hot workman-related lead? That sounded dirtier than I thought.
    • One slightly different instance in "Almost Famous". Castle talks about pumping Manschaft until he pops. There are very quick cuts showing reaction shots before the scene moves on. Though from Castle's tone, it's more a matter of Getting Crap Past the Radar.
    • From "Secret's Safe With Me", as Beckett, Ryan and Esposito confront a suspect cutting into a safe with a welding torch:
      Beckett: Take your hand off your tool, Marco!
      [Ryan and Esposito snigger immaturely]
      Beckett: ... Shut up.
    • In "Still" after Castle reviews a number of examples of Beckett's supposedly inappropriate comments in the work place:
      Beckett: That's not how I meant it. I can't help it if you get off sticking things in my mouth.
      Castle: See, like that. I can't even — I can't...
  • The Big Damn Kiss: At the end of "Always", Beckett and Castle finally have their long-awaited, well-deserved kiss.
  • The Killer Was Left-Handed: clues Castle in that the case isn't over.
  • The Tease: Beckett takes great amusement in leading on Castle's obvious attraction to her, only to bluntly shoot him down. Lampshaded in "The Mistress Always Spanks Twice":
    Castle: You should really moonlight [as a dominatrix]. Trust me — you would make a fortune. Come on, isn't there anything you would like to do with your handcuffs besides arresting criminals?
    Beckett: No...[seductively] but there is one hot, wild, kinky thing that I do like doing...
    [Castle's elbow slips off the table as he stares at her earnestly]
    Beckett: [Flatly] Putting killers behind bars.
    Castle: [Disappointed] See, you're already a tease — you're halfway there.
    • Turns against her in "47 Seconds" when Castle learns that Beckett remembers everything he said when she was shot, and comes to believe that it really is all just a joke to her. For the next few episodes, Castle distances himself from her, leaving her to wonder what she did to deserve his treatment of her.
  • Theme Tune Cameo:
    • In "Home is Where The Heart Stops", Castle is sitting alone in the car humming his own action-scene Leitmotif. When the bad guy shows up to hijack the car and drags Castle into a fistfight, he stops humming and the leitmotif starts playing over the scene. After the suspect is caught, he hums it again off-screen, only for Beckett to shut him up.
    • When Castle walks into the The Old Haunt in Last Call, the bar's piano player starts playing that leitmotif again. Castle even thanks the piano player for remembering and tips him.
    • This also comes up in one of the "musical stings" that Castle uses to end a scene in "Swan Song".
  • There Are Two Kinds of People in the World: Used in the Opening Narration for all of Season Two.
    Richard Castle: There are two kinds of folks who sit around thinking about how to kill people; psychopaths and mystery writers. I'm the kind that pays better.
  • They Fight Crime!: He's a lecherous mystery novel writer! She's an uptight police detective!
  • The Thing That Would Not Leave: Alexis' boyfriend Pi, in the first few episodes of season six, makes himself very comfortable in Castle's apartment and shows little evidence of intending to leave. In "Time Will Tell", Castle finally tells Alexis to make Pi move out, only for her to tell him they're moving in together.
  • This Bear Was Framed: In "The Fast and the Furriest", evidence at a crime scene suggests that a murderous Bigfoot is stalking the streets of New York City. Castle is only too willing to believe that a Bigfoot is the culprit, but Beckett, Ryan and Esposito are convinced the murderer is more mundane. They are, of course, correct.
  • This Is for Emphasis, Bitch!: In The Final Frontier, the washed up alcoholic captain from Nebula 9 gets held at (deadly) laser gunpoint by a former costar who betrayed and shot him in show, but elbows his captor, grabs and flips her forward, then grabs the gun and says:
    Gabriel: I've been waiting ten years to do that, bitch.
  • This Is Reality: Tried twice in the pilot and subverted both times:
    • First, when Castle gets irritated that, unlike in the TV shows, lab results could take weeks to get back, Castle just calls up his good friend the mayor to help speed things along; they get the results back before the end of the day.
    • Then, when the alleged suspect is apprehended midway through, Castle has the sneaking suspicion that it's not over, because (as his poker buddies tell him) "the reader would never buy it." At this, Beckett plainly says that life is not like "one of your books". Except, of course, he's right, and their suspect is a patsy.
  • Those Two Guys: NYPD detectives Javier Esposito and Kevin Ryan that Kate works with. It wasn't until "When the Bough Breaks" (the fifteenth episode) that we saw those two apart for even a moment.
    • Not quite true — since Ryan wasn't originally supposed to be a character, there are some moments in the pilot when Esposito is walking around with some other random detective. Ryan's absence is VERY noticeable when you re-watch it after a few other episodes.
    • In "The Blue Butterfly", they play a villainous duo in the flashbacks (Castle's imagination as he reads a diary from the 1940's).
  • Time Bomb: "Countdown" has a dirty bomb with a timer set to go off in New York. Castle and Beckett find the bomb with less than 2 minutes. They send a cell phone picture of the bomb to an expert, but he can't get the pictures in time on his cell. Castle and Beckett brace for the explosion, only for Castle to yank all the wires with the timer reaching 0. No boom.
    • In "Still", The pressure bomb Beckett steps on also turns out to be a time bomb, with a 5-letter password. The gang figures out that it's supposed to be the name of the killer's son, who was born while he was in prison. With 5 seconds left. No boom. She can leave.
  • Title Drop: Episode titles are dropped quite often, because they either would make great names for Castle novels, or already are great names for Castle novels.
  • Token Minority Couple: Lanie and Esposito as of "Poof! You're Dead." Except for an offhand lewd remark in one episode, there is no buildup to this which is lampshaded by several jokes in the vein of "Can you believe they still think we don't know?"
  • Token Black Friend: Medical examiner Lanie, Kate's first friend seen in the show, is a sassy black woman.
  • Tonight, Someone Dies: Promos for "Knockout" used a Castle line "One of them is gonna die." Though it's only a tangential line (Castle was actually referring to the possibility of Beckett and Lockwood having a confrontation), Captain Montgomery ends up going out in a blaze of glory.
  • Too Dumb to Live: The third hostage in Number One Fan who repeatedly tried to attack the captor. Unfortunately he ends up being to dumb for other people to live as not only did he almost get his fellow hostages killed he got Castle shoot point blank in the chest.
    • He also repeatedly antagonized the captor something he was repeatedly told was a stupid thing to do.
  • Toplessness from the Back:
    Castle: You forgot your swimsuit.
    Beckett: [grinning mischeviously] I know.
    • In "Clear & Present Danger", when Beckett tells Castle she's going to Slip into Something More Comfortable, she comes back wearing her birthday suit, which we only see with a shot of her bare back.
  • Torture Is Ineffective: In "Knockdown" Ryan and Esposito are captured by an ex-Special Forces Elite Mook and tortured by being ducked in ice-cold water. Ryan snarks to his torturer that he went to Catholic school and they used to do that to him for talking in class. Meanwhile, Esposito, himself a retired Green Beret, goes:
    "Listen to me. You're too late. The cops already know everything about... me and your mom." (he and Ryan bust out laughing)
  • Tragic Keepsake: "A Chill Goes Through Her Veins" reveals that Beckett wears her mother's wedding ring as a reminder of "the life I lost". Also inverted, in that she also wears her father's watch to remind her of 'the life I saved'; she helped him recover from alcoholism and grief after her mother's death broke him. Because the latter's more visible (and unusual), Castle mistakes it for the former.
    • Beckett shows Castle another one in "Secret's Safe With Me", a stick-figure doll that she and her father made out of odds and ends at the beach where they went for a walk during her mother's funeral.
    Castle: Does that day make it a bad memory or a good memory?
    Beckett: Both. It's a reminder that even on the worst days, there's a possibility for joy.
  • Tranquil Fury:
    • Beckett in "Probable Cause" in the final confrontation with Jerry Tyson a.k.a 3XK, after a brief gunfight, she ends up stalking towards his car firing shot after shot into it/him with a terrifyingly blank expression on her face, Terminator-style. Apparently she didn't appreciate the whole 'frame Castle for both cheating on her and murder' thing he was responsible for.
    • Castle in "Target", when facing down an accomplice to his daughter's kidnapping. He turns from helpless and worried to cold and vengeful literally in the blink of an eye.
  • Trauma Swing: In the season 4 finale "Always", Kate Beckett is seen sitting on a swing in the rain after surviving an attempt on her life, and being suspended/resigning from the force. Word of God says it's a Call-Back to when Castle and Beckett had a conversation in the same place back in the season premiere.
  • Treachery Cover Up: The team agrees to hide Captain Montgomery's shameful past after his death at the end of the third season.
  • The Triads and the Tongs: The team's investigation of 3XK in "Kick the Ballistics" leads them to a Tong. Beckett mentions that most Tongs are legitimate merchant organizations but a few are involved in criminal activity.
  • Triang Relations: It starts with a Type 5 in "Den of Thieves," Type 4 with Castle being A and Beckett and Demming taking up B and C at the end of "Overkill", and either Type 4 with Beckett being A, Castle being B and Gina being C or Type 10 with Gina being A, Castle being B, and Beckett being C at the end of the Season Two finale.
  • Trouser Space/Victoria's Secret Compartment: In "Home Is Where The Heart Stops", Beckett has to make an arrest while at a black-tie event, wearing a rather skimpy dress.
    Castle: Where was the badge?
    Beckett: Don't ask.
  • True Companions: Settled in the third season finale:
    Beckett: [to Ryan, Esposito, and Castle] No one — no one outside of this immediate family, ever needs to know about this.
  • Turn in Your Badge:
    • Though no actual badge-turning occurs, Montgomery sends Beckett home after she roughs up a witness in "Knockdown". Then he sends Castle home, too.
    • Fallon does something similar in "Setup."
    • In the episode "Always", Gates has Esposito and Beckett turn in their badges for withholding evidence and lying to her. Beckett tells her to keep it as she's resigning.
  • Twerp Sweating:
    • Averted in "A Death In The Family" — Castle wants to scare Alexis' date with a fake severed head, but she cuts him off at the pass. Lampshaded in the same episode when Castle and Ryan reminisce about the ways the fathers of their prom dates had done this, leaving the previously clueless Beckett to come to the dawning realisation that this was what her dad was doing when she was upstairs getting ready for her prom.
      Beckett: Now that you mention it, he looked terrified. And this whole time I thought he was scared of me.
    • Castle later pulls this off pretty well, mostly by accident, in "Punked." He storms in with an antique dueling pistol and demands to know who is sullying his honor. Unbeknownst to him, Alexis and her boyfriend are making out at the time.
    • A Deleted Scene from season 3 has Jim Beckett inadvertently do this to Castle. And it is magnificent.
    • Lampshaded in a conversation between Castle and Beckett at the beginning of "Recoil":
      Beckett: So what makes you so sure that Alexis isn't serious about this guy?
      Castle: Well, I haven't met him or approved of him yet, so I can't be certain. All suitors must be met and intimidated by me, personally, before they can be considered for official boyfriend status.
  • Twin Switch: A rather big key to the plot of "A Dance With Death". Difficulty: the women who switched weren't even related; a woman who worked as a stripper was given money by an heiress to get plastic surgery to appear at events as her double. Then the heiress is killed in a train accident, allowing the stripper to assume her identity full time, fooling everyone...except the heiress' manager and former boyfriend, who killed her for assuming the identity.
  • Twin Threesome Fantasy: An actress who has been studying Beckett in order to better portray Nikki Heat (in the episode of the same name) gets a delivery that's "supposed to help with [her] research," then goes to change. A couple of scenes later...
    Beckett: I contacted other precincts to find out who else is investigating her and for what.
    Rhodes: [walks into the room with Beckett-styled wig and pantsuit] Talk to enough people, something usually shakes out.
    Castle: [pencil falls out of hand, as Beckett stares at Rhodes] Just like I dreamed it...!
    Beckett: [GLARES at Castle]
    Castle: ...Did I say that out loud?
  • Twist Ending: "Watershed". The audience — and Beckett — are led to believe that Castle is about to break up with her over their argument about her potentially taking a job in Washington D.C. Pretty much everything is framed and builds up to this inevitable conclusion... thus making it a Wham Episode for both when he proposes marriage to her instead.
  • Two Lines, No Waiting:
    • Subverted in "The Double Down", it seems as though two investigations are going on at the same time, but then they turn out to be connected.
    • "The Fifth Bullet", as well, although it takes all of five minutes for them to connect Riley Amnesia Guy to the murder.
    • "After the Storm" has Ryan enlisting Castle and Beckett to find Montgomery's friend, while Esposito tries to identify Beckett's shooter. They run into each other later inside the building where the shooter tries to find the incriminating files against his employer.
  • Tyrant Takes the Helm: In comparison to Montgomery, Victoria "Iron" Gates fits this trope to a T.

  • Uncle Pennybags: Though used variously in the earlier seasons where Castle would use his wealth and influence to do something, as of the later seasons, this aspect of his character has been heavily downplayed. Likely due to the show really hitting its stride and not needing such exaggeration.
    • Two notable moments in Season 3; in "Last Call" he gave a sizable donation to the NYPD Widows and Orphan's fund to buy a bottle of Mayor Beau James Walker's legendary whiskey (not to mention buying the bar that was a centerpiece of the episode); and in "Lucky Stiff" when, after realizing that Beckett would want to honor her mother's legacy if she won the lottery, offered out of the blue to help set of a law-school scholarship program in Johanna Beckett's name, with Kate's blessing of course. Though that was a fundraiser.
    • Still referenced in Season 4; when Castle first reads the bill for his actions during "Eye of the Beholder", his only response is to say it's "a good thing he's rich".
    • In "Secret's Safe With Me", Castle commonly carries $2,000 cash and is only excited about potentially finding the expensive stolen bracelet; even though he knows he can't keep it and already has plenty of money, he's just excited about the thrill of discovery.
  • Undercover Model: In "Deep in Death", Kate Beckett does this on the fly around Russian mobsters. More specifically: she ditches all her clothing save for (bright red) underwear and a cardigan, which she wears as an improvised dress showing lots of leg and Absolute Cleavage.
  • Undying Loyalty: "Knockdown" makes this almost painfully clear.
  • The Unfair Sex: In "Cloudy With a Chance of Murder", to shield his and Beckett's relationship, Castle goes on a talk show and says he's single... and then accepts a date with the show's host... who's all too eager to get in his pants. During her advances, Castle butt-dials Beckett, who hears crashing noises and thinks Castle's under attack. By the time she gets there... here's Castle on the couch with a woman in a bikini. Naturally, she's pissed at him, and the whole thing is played for laughs. Here's where the trope comes into play... reverse the positions of Castle and Beckett. Would the writers ever play Beckett being hit on uncomfortably by a male suitor (even if it were Castle) for laughs?
  • Uninvited to the Party: Alexis has to deal with an ex-friend who invites their whole class to her birthday party except for Alexis, including Alexis' boyfriend. The girl plans to break up Alexis and her boyfriend by kissing him at the party and putting the photos up on social media, but fortunately Alexis doesn't fall for it. Unfortunately, Castle escalates the situation by getting Ryan to take the photos down, resulting in a Bathroom Brawl. Turns out the girl felt abandoned by Alexis, and chose the stupidest way of dealing with it possible.
    Castle: Did you at least kick her ass?
    Alexis: Kinda.
    Castle: That's my girl.
  • Unishment: Due to his unlawful actions during Reckoning, Castle is sentenced to one thousand hours of community service assisting Beckett at solving cases, just like he always did until he got banned from the 12th Precinct at the end of Bad Santa.
  • Unrequited Love Switcheroo: Seems like every third episode, now. Just as Beckett gets over Demming, here comes Castle's ex-wife. And just as Castle's done with his ex-wife, here comes Josh.
    • On a broader scale: Season 3 highlights Castle's one-sided feelings for Beckett, where for most of the season, Beckett is with Josh. Somehow, this doesn't keep him and Beckett from kissing one another just to distract a guard, as well as getting locked in a freezer and nearly dying together, two events which leave Castle wondering where the both of them stand. Season 4, on the other hand, shows Beckett pining more for Castle than the other way around, as Castle is (for most of the season, at least) thinking that Beckett is unaware of his feelings for her, while she somehow keeps expecting him to act on those feelings, which she doesn't admit to knowing. The extent to which she expects Castle to do something about their relationship is shown in her occasional therapy sessions, the only place where she's a lot more honest about her feelings (yet still continues downplaying them).
    • This becomes even more the case when Castle finally learns by accident that Beckett lied to him about not knowing about his feelings toward her (just as he was finally ready to act on said feelings) and comes to the false conclusion that she not only dosen't love him back, but that she's been deliberately stringing him along for almost an entire year. Afterwards, a bitterly hurt Castle tries to move on and even attempts to return to his former womanizing ways for a brief period, while a perplexed Beckett desperately tries to talk to Castle and find out why he has suddenly become cold and distant toward her. At one point, Castle actually encourages Beckett to work together with handsome British detective Colin Hunt (while in the past Castle was actively jealous of any romantic rival toward Beckett) around the same time that Beckett confesses her feelings for Castle to Laney, who warns her that she may now be too late. This comes to a head in the season 4 finale when Beckett's obsession with catching her mother's murderer at the possible expense of her life (which Castle has spent the entire season trying to protect her from) finally causes him to walk out on her completely. When Beckett has a confrontation with her mother's assassin and is almost killed, she finally realizes that she no longer cares about catching her mother's murderer and that she just wants Castle and goes to his apartment to tell him this. While Castle is initially wary at Beckett's sudden appearance at his door, she ultimately wins him over and they finally get together after four years of UST.
  • Unspoken Plan Guarantee: "Hunt" has Castle and his father plotting an assault on the building where Alexis is being held. We first see them planning to take out the electricity by planting a bomb, only for Castle to get caught doing so. Only after Hunt announces to Volkov "You'll be dead" is it revealed that they planned for that to happen, as the scene cuts to a flashback of the full plan.
    • Similarly, in "Reckoning" Castle and the police stage a plan to trap Jerry Tyson, aka 3XK, who had kidnapped Beckett. Tyson gets the drop on Castle, ties him up and gloats that he will make Castle watch as he kills Beckett. Castle then reveals that his capture was part of the plan; he played on Tyson's narcissism to draw him out, using himself as bait. With Esposito outside with a sniper rifle waiting for Castle to give the word;
    Castle: The truth is, I lured you here, to watch you die. Are we clear?
    Tyson: Clear about what?
    Castle: Then take the shot. (BOOM!)
  • Unwinnable Training Simulation: The first episode of season 6 jumps ahead 2 months into what appears to be an Action Prologue demonstrating that Beckett is A. now a federal agent, and B. still a total badass — until she learns too late that the hostage she was protecting was actually another bad guy, when said hostage shoots her several times in the chest. Cut to the office, where she's being questioned about the training exercise that the audience had no idea they were watching.
  • Uptown Girl: A gender-inverted example; the series is essentially about a millionaire (Castle) and a working-stiff police officer (Beckett) falling in love with each other.
  • Urban Legend Love Life: Despite the claims of his The Casanova charms, Castle has had sex or relationships with surprisingly few women during the show.
    • However, it's a plot point that he's interested in Beckett very soon after they met, so even though they're not an official couple, he isn't pursuing other women as much during the show as he used to and is more likely to reject their advances. Many characters in the first few seasons mentioned him being more serious about their working relationship than he was about previous actual relationships.
    • Conversely, Beckett is shown or mentioned to have dated a number of men; more than Castle has dated women. While this doesn't necessarily translate into a love life (since it's also mentioned she doesn't really connect with people well), it's suggested that she intentionally self-sabotages relationships by dating for the short term and dating people she knows aren't ultimately compatible. Refreshingly though, the show makes no comment on the matter of sex and romance for a female lead and simply treats it as the activities of a normal adult.
  • UST:
    • The show manages to up the ante on shows like The Nanny and Bones by having Castle more or less repeatedly go to Beckett "So! When are we sleeping together?"
    • In 2x13, "Sucker Punch", Beckett refers to Castle "pulling her pigtails" and admits that she likes it.
    • In 2x14, "The Third Man", ends with Castle and Beckett walking out of the police station arm-in-arm to head to a burger joint after their fancy dates (with other people) fall-through due to the case-of-the-week. As they walk, Beckett is playfully twirling her hair with her finger, something that Castle had noticed her doing earlier while talking to her date on the phone.
    • 3x05, "Anatomy of a Murder", had Castle comments to Esposito about how true friends will help you break out of jail. Beckett casually walks by and comments that she'd spring him, and the look on Castle's face is absolutely priceless. Also, the Love Letter Lunacy played for epic amounts of Ship Tease in the same episode... GAH!
      • Castle's reaction to Beckett's comment is much bigger than what it looks like, because his mother told him before that breaking a loved one out of jail was "true love".
    • 3x11, "Nikki Heat", has a With This Ring moment where Castle casually offers an engagement ring belonging to Ryan to Beckett and asks her to marry him. Subsequently, an actress studying Beckett to portray Nikki Heat hangs the biggest lampshade ever as she spells it out, word-for-word, to Beckett:
      Rhodes: I don't get it. He's into you, but you're determined not to give into these feelings that you clearly have for him, so he fantasizes about you through his writing. It's literally verbal masturbation.
    • 3x13, "Knockdown". The guys bring a Genre Savvy Smug Snake into the interrogation room. Aside from being entirely unflappable, he figures out Castle likes Beckett within seconds.
      Simmons: He's sweet on you. Makes him brave.
    • 3x21, "The Dead Pool". Castle confesses his jealousy when Beckett starts spending time with another writer.
      Castle: Yes. Fine, it's true. I'm jealous. There, I said it. I-I want you all to myself, and to have you spending time with another writer? That upsets me! And if that makes me petty, so be it. Guilty as charged.
      Beckett (smiling) : Actually, I kinda think it's sweet.
      Castle: You do?
      Beckett: I do. And that's why you don't have to worry about me hanging around with Conrad anymore. From now on I'm a "one writer" girl.

  • Vanity Plate: In a rather touching tribute, the show used the late Stephen J. Cannell's Vanity Plate at the end of "Punked".
  • Vapor Wear: Played with in the season five premiere. Beckett, when sneaking out of Castle's bedroom suddenly stops, makes a face, grabs her breasts through her shirt to make sure, and then sneaks back in to retrieve her forgotten bra.
  • Vehicle Vanish: In "Dial M for Mayor", Castle meets with his mysterious informant in a parking garage. A car passes between the two of them, blinding Castle with its headlights. When it has passed, the informant is gone.
  • Vigilante Man: Seemingly, the murderer in "Heroes and Villains" but subverted when it turns out that it was a mob boss impersonating the vigilante in order to kill two birds with one stone — offing his traitor and getting the vigilante arrested.
  • Villain Has a Point: "Get a Clue" involves a woman being killed after finding a huge bag of The American Revolution-era half-dimes worth over a million dollars each. Her cousin wants to sell them to pay for his mother's assisted living but she insists on donating them to a museum due to their historical value. This motivates the cousin to kill her. If she'd just given him one half-dime, the whole mess could have been avoided.
  • Villainous Ethics Decay: Paolo, the jewel thief Castle consults in an early episode, describes his career as being a "ghost," sneaking into people's homes while they're out, leaving no trace except to relieve them of their jewels. Meanwhile, he calls the current thieves "vampires," with a desire for blood and violence, who seem more concerned with making people suffer than actually making a profit. His skill with a Stealth Hi/Bye and the fact that his "revenge" against Castle for earlier revealing his identity is teaming up with Martha to embarrass him at a charity gala, while the current thieves beat a woman to death and shoved her into a wall safe, does lend some credence to his description.
  • Villainous Rescue: Bracken sends his personal contract killer to save Beckett from being executed by one of Bracken's own people as repayment for her saving his life in an earlier episode.
  • Visual Pun: During The Big Damn Kiss in "Always", Castle pushes Beckett against the door, closing it behind them as they continue kissing. As Beckett has been known to say in the past, "Shut the front door!"
  • Voiceover Letter: See Dead Man Writing section.

  • Wacky Parent, Serious Child: Richard (and Meredith) to Alexis, and to a slighter extent, Martha to Richard.
  • Waistcoat of Style: Ryan just isn't Ryan without that third piece in his three-piece suit.
  • Wait Here:
    • Castle, natch. Happens so frequently that it borders on Running Gag. The few times where Castle listens and does stay, the bad guy runs by him or otherwise gets Castle involved anyway.
      Kate: You're staying here.
      Castle: Yes, we've seen how well that works out.
    • There's also the time in the pilot when Beckett handcuffs him to the squad car, and he gets hijacked by the suspect.
    • Subverted in "Boom!", in which Kate hands Castle a gun as they go to bust the killer, and Castle just stands there in disbelief for a second.
    • Earlier in "Boom!", Beckett is told to wait in the van (since the killer is specifically looking for her):
      Castle: Now you know what it's like for me.
    • From mid Season 3-ish on, it seems Beckett (and when applicable, Ryan and Esposito) have all but given up telling Castle to stay put, and this trope pops up only as an occasional gag.
  • Waking Up at the Morgue: The main suspect in "Undead Again" is found dead. This being a zombie themed episode, Castle is wary of the corpse rising again... which it does, not two seconds after Perlmutter assured him that it wouldn't. He's not really dead, and how he got into that zombie like state is the crux of the rest of the ep.
  • Water Torture: In "Knockdown", assassin Hal Lockwood captures Ryan and Esposito and ducks Ryan in ice water while Esposito is Forced to Watch. It's incredibly ineffective: Ryan snarks that they used to do this to him in Catholic school for talking in class, while Esposito tells Lockwood:
    "Listen to me, you're too late. The cops already know all about me and your mom."
  • Wealthy Yacht Owner: Johnny Vong, a minor character in the episode "Sucker Punch", claims in his infomercial that he came to America on a boat, and now "I own a boat!" The second one may be true, but he's really from Danville, California and affects a Chinese accent to attract customers.
  • We Have to Get the Bullet Out: In "Deep Cover", Castle becomes an impromptu nurse who does this to his own father.
  • "Well Done, Son!" Guy: Both averted and subverted in "Hunt". Averted in that when Castle finally does meet his father, he says that despite not being in Castle's life he was always proud of him. Subverted in that although Castle never sought his father's approval, receiving it is obviously meaningful to him.
    • Beckett tacitly invokes and parodies this trope in-universe in "Under the Gun". A suspect who happens to be Beckett's old training officer calls the precinct on the phone, and Beckett delivers to him a long, bitter and arguably Narm-y tirade about how much he's betrayed her, etc. Clearly genuinely upset, he rings off. Beckett immediately collects herself and calmly asks Ryan and Esposito 'Did I keep him on long enough?' It turns out that she was doing it only so that he'd stay on the phone long enough for them to trace his call — which he did, and they did. The trope is then played straight, in that when Beckett walks away, her face reflects how upset she actually is.
  • Well-Intentioned Extremist: Senator Bracken, the man behind Beckett's mother's murder, believes himself to be this — he tells Beckett in "After the Storm" that everything he's done has been to improve the lives of the needy. Beckett, whose mother was a casualty of Bracken's drive to be in a position where he can do this, naturally has a different view on the subject.
  • Western Terrorists: In "Setup/Countdown" the villains turn out to be Western Terrorists after teasing that they were Muslim extremists.
    • In "47 Seconds", the chief suspect in the bombing of a Take Over Wall Street protest was a right-wing activist. Turns out it was a reporter who wanted to use the bombing for fame, and a left-wing protester seeking to gain sympathy for his movement.
  • Wham Episode:
    • "Sucker Punch", where Beckett arrests, then has to fatally shoot her mother's hitman, destroying the best chance she had of finding out who ordered the hit.
    • "Knockdown", where the head officer on Beckett's mom's case is shot, Ryan ends up getting tortured by drowning and almost shot in the kneecaps, and the shooter (who is deeply involved with the conspirators responsible for Beckett's mother's murder) is incarcerated where Beckett can get to him.
    • "Knockout", where Lockwood escapes and murders the other cop implicated in Beckett's mother's murder, Captain Montgomery is revealed to have been with them as well and knows who The Man Behind the Man is, both he and Lockwood kill each other, and at Montgomery's funeral Beckett is shot. Oh, and Castle finally tells her that he loves her. As she's slipping out of consciousness.
    • "Always". Good God, "Always". Alexis graduates high school, Beckett confronts the man who shot her, resigns from the police force, and tells Castle that the only thing she wants is him. Every constant this show has has just been turned upside down.
    • "After the Storm". We learn the identity of the man behind the various conspiracies the show has had going, including the murder of Beckett's mother — namely, William H. Bracken, Senator for New York. Beckett blackmails him to stop the attacks, leaves a scar on his face as punishment, and Gates says she knows Montgomery's secret.
    • "Probable Cause", despite being unrelated to the story arc of Beckett's mother's murder. In the course of investigating a bizarre murder, all evidence points to Castle as the most likely suspect. He is arrested, and while in the holding cell, is visited by the real culprit, Jerry Tyson (3XK). Castle eventually escapes with Beckett, which leads to an apparently final confrontation with Tyson where Beckett shoots him repeatedly and he falls off a bridge. As the authorities are unable to locate his body afterwards, Castle is convinced that the entire thing was a setup to help him disappear for good and begin killing again.
    • "Recoil". What appears to be yet another murder tied to Senator Bracken — the one responsible for Beckett's mother's murder — turns out to be that of a killer planning to murder the senator. Beckett encounters the very troubling dilemma of either doing her job and protecting the senator from the killer, or allowing the killer to succeed and finally getting revenge on the senator. Beckett ends up saving the senator's life, but doesn't get any closer to being able to take the senator down.
    • "Target"/"Hunt". Alexis and a friend from school are kidnapped, and she gets in contact with her father after escaping. It's discovered that she's in Paris, France and gets recaptured. Castle later uses his connections to attempt to find her on his own, and ends up being betrayed by the man he hired. He is saved, however, by a man who later reveals himself as Castle's father, and that everything that happened was a plot to draw him out. The two of them succeed in saving Alexis, and Castle's father disappears again, but not before telling his son how proud he is.
    • "Watershed". Beckett interviews for and is about to accept a job with the Federal Task Force, located at Washington DC, and right before she announces her decision to Castle, he in turn proposes to her.
    • "Valkyrie": Castle only has one day to live after being exposed to an aerosolized biochemical agent that was planted in the (framed) suspect's car, which he had the misfortune of being in after being abducted by said (framed) suspect.
    • "Disciple": Two murder victims turn up who bear uncanny resemblances to both Lanie and Esposito. In the course of the investigation, Castle guesses — correctly, as revealed later — that 3XK is back, and is raising up another serial killer.
    • "In the Belly of the Beast" is a major one for season 6, as Beckett's undercover investigation into a money laundering ring reveals a massive scheme to line the war chest of the very own Senator William H. Bracken, who on television announces his intention to run for president.. During this process, Beckett is tortured and almost killed but Bracken sends a contract killer to save her in repayment for her saving his life in "Recoil".
    • "For Better or Worse" seems like a lighthearted finale after Beckett took down Bracken in the last episode, about Beckett having to chase down an old boyfriend to get him to sign divorce papers so she could legally marry Castle. After many wacky hijinks ensue, including the venue and Kate's original wedding dress is destroyed, everything seems to be back in working order (they relocated to Castle's Hamptons house, Kate's in her mother's dress, wearing Martha's blue earrings, Castle has cleared up the divorce and gotten the marriage license and is hurrying back to the Hamptons...when a mysterious car pulls up alongside him. An hour later, Beckett gets the call...and rushes to find Castle's car off the road in flames.
    • "XX": After revelations that Rachel Mccord was murdered and the only person who survived the team's demise thinks Beckett is the cause thanks to her investigation into Locksat, Beckett decides to leave Castle in order to protect him from the powerful forces that could have him killed.
  • Wham Line: In "Rise", Beckett tells Castle that she doesn't remember anything after being shot. At the end of the episode, she tells her psychologist that she actually remembers everything that happened.
    • In "Linchpin", "Your father will be very proud." Said by the turncoat Sophia, to Castle. Of course, since she'd just revealed herself to be a Russian double agent, it's probably all Blatant Lies.
      • In "Hunt", it turns out he is. Less a Wham Line, but she wasn't lying. Just being a bitch.
    • And again in 47 Seconds, where Beckett tells a suspect that claims to have amnesia that she was shot "and remembers every second of it", with Castle listening behind the one-way mirror, in a moment of self-inflicted Engineered Public Confession. Castle becomes passive-aggressive the rest of the season, as a result.
    • "Always". "Beckett, what do you want?" "You."
    • In "Target", after a kidnapped Alexis gets in touch with them, they track her location. "That can't be right". "What? Why?" "It says the call's originating from a tower in Paris, France."
    • "Hunt":
      Castle: I don't understand. What does this have to do with Alexis? Why would they take her?
      Hunt: Because I was careless. Because somehow he found out who she was, who you were, and he knew I'd come for her.
      Castle: Why? Why would you come for her?
      Hunt: Because she's my granddaughter.
    • "Still": "Oh, for heaven's sake, Detective, just kiss the man!" Did that not sound like one? The wham is in who said it: Captain Gates.
    • Watershed: "Katherine Houghton Beckett, will you marry me?"
    • "Valkyrie", at the very end: "Based on the amount found in your bloodstream you have less than a day to live." Followed by an ominous To Be Continued. There's a season opener for ya!
    • "Need to Know". "I just came to tell you that you're fired." It's even worse in context — Castle has just told Beckett that he got an apartment in DC for the two of them to live in.
    • "Bad Santa". "I'm sorry, Mr. Castle, but you are no longer permitted to work with the NYPD."
    • "Hollander's Woods". "Detective Beckett, we'd like you to be a candidate for the New York State Senate."
    • "The GDS". "What happened was my fault. The murder of Beckett's former AG trying to protect Beckett from Loksat, I inadvertently sentenced them all to death."
  • What the Hell, Hero?: Martha deals one of these to Castle in "Knockdown," during a rare Mama Bear moment.
    Martha: Richard, this isn't one of your books. You don't know the ending. You were just lucky yesterday.
    Castle: You're overreacting, mother. Where is this coming from?
    Martha: [incredulous stare, tearing up] How the hell can you ask me something like that? Think about how much you love Alexis and that is how much I love you and don't you dare ask me where this is coming from! [calming down] You have gotten through most of your life on your wit and your charm and no small amount of talent, but that is the real world out there. And you can't charm your way out of a bullet.
    • Again in "Knockout" with Castle calling Beckett out for her Will They or Won't They? behavior:
      Castle: Alright, y'know what? I don't know what we are. We kiss and then we never talk about it. We nearly die frozen in each others' arms but we never talk about it. So no, I got no clue what we are.
    • Lanie calls Beckett out in "The Limey" for not telling Castle what she feels for him, and about the fact that she knows he loves her.
      Lanie: Oh, what, was that supposed to be some big secret?
      Beckett: Yes... [Lanie glares at Beckett] No... [Lanie narrows her eyes] Do you think he knows?
      Lanie: You remember how he used to be? Girl on either arm? You really don't see that guy too much anymore; why do you think that is? He's waiting... for you.
    • In "Always", Castle calls Beckett out for keeping silent about the fact that she knew his feelings about her and never said anything in the entire year. In the same argument, Beckett accuses Castle of betraying her by keeping the fact that he'd been in contact with Mr. Smith and keeping his information secret, arguing that, regardless of the emotional issues she's been struggling with concerning her mother's case, she had a right to know. Needless to say, things get pretty heated and emotional on both sides.
    • As of Season 8, both Rita a.k.a. Jackson Hunt's ex-wife and Mr. Smith have laid into Beckett for putting her marriage in jeopardy to pursue a path of revenge that has little to do with her. Even though deep down, it seems like she agrees with them, she's already set on following this through to the end.
  • What the Hell Is That Accent?: The general reaction British viewers - especially ones in the Northeast of England - had after hearing a fellow from Newcastle on "And Justice For All." Writers' assistant Nick Hurwitz responded.
  • White-Dwarf Starlet: Castle's mother.
  • White Gangbangers: The Westies, an Irish gang in NYC, make multiple appearances, first in "Sucker Punch", and much later in "Headhunters".
  • Whodunnit to Me?: In the two-part seaon 6 opener, Rick is exposed to a nerve gas and given 24 hours to live. He and Beckett use the time to attempt to locate the perpetrators and recover the gas and (hopefully) the antidote.
  • Whole Plot Reference: S 8 E 18, "Backstabber," is more or less a modernized take on GoldenEye. An MI6 agent who believes he was betrayed by the agency secretly plots an electronic attack on London to cover up a bank theft while his former partner must track him down and settle the vendetta between them.
  • Why Won't You Die?: Mild mannered safety inspector Alan Masters frustrates his would-be assassin by repeatedly refusing to die. He gets poisoned, electrocuted and shot in the head.
  • Wild Teen Party: In "Heartbreak Hotel", Alexis watches in slowly growing horror as one of these takes place in her own home. In a variation, she acknowledges that her father probably won't care, but the problem is that she does.
    • Alexis goes to one the night of her graduation, and returns home in "After the Storm" with a hangover.
  • Will They or Won't They?: Definitely: Leaning towards "they will". And doesn't Castle know it. During one case they get asked if they're together, to which Beckett responds "No." Castle's simultaneous response? "Not yet."
  • Wistful Smile:
    • Castle will often have a sad smile when reflecting on his daughter Alexis growing up.
    • Beckett will also have a wistful smile whenever she reminisces to Castle about her late mother, whose murder set her on the path to being a cop, and whom she clearly loved and remembers fondly, as there were many happy times between them.
  • Wire Dilemma: Averted in "Countdown". Facing a dirty bomb with literally no time on it and nothing else to lose, Castle just rips all the wires out of the triggering device. It works.
  • Women Are Wiser: Played with; Alexis is a lot more grounded and mature than her father is, but compared to his ex-wives, and to a (slightly) lesser extent his mother, Castle himself is a bedrock of maturity, common sense and selflessness.
  • Won't Take "Yes" for an Answer:
    • Variation in "Law and Murder": Captain Montgomery pulls Beckett and Castle in asking them why they pulled the DA's secretary in without the DA's knowledge. Beckett starts to apologize, but Montgomery cuts her off... with "Smart move." Since the DA could have just called to demand his secretary back, but came personally to stop the questioning...which means he's probably hiding something.
    • In "Knockout", Beckett goes to Captain Montgomery to tell him she wants Castle gone, fully expecting to hear that it isn't possible because of his friendship with the mayor, and starts vehemently arguing her case only to realize he agreed. Her flustered response is all the proof he needs that she wasn't serious and was just venting.
  • Working the Same Case: "The Double Down"... which does nothing to dull the wager on whether Castle & Beckett or Ryan & Esposito will solve their case first.
    • "Need to Know". Just as Castle is able to work with Ryan and Esposito again on a homicide case, Beckett and McCord suddenly take over, making Esposito question Castle's loyalty. And just as they start making headway on the case, the CIA then takes the case from them.
  • Worth It: Captain Gates is the no-nonsense type when it comes to police work. But for the chance to chew out Castle and watch him squirm, she agreed to be part of the elaborate birthday surprise Beckett set up when Castle and Beckett "broke into" the suspect's storage unit.
  • Wounded Gazelle Gambit:
    • Done to Castle in "Love Me Dead". He finds it discomforting that someone could tell him a story and make him believe it and that someone was able to take advantage of his hidden heart of gold. Especially since the person doing the gambit had killed two people.
    • Also in "The Late Shaft", he floats Beckett's suspicion that an actress is only sleeping with him to get the Nikki Heat part in the Heat Wave movie, and she breaks down in tears. She was (as well as doing the same with the head of Bobby Mann's network), but he still recommends her to the producers because she made him believe the gambit.
    • Perhaps a Brick Joke as of "Nikki Heat" when we meet the actress who plays Nikki Heat in the movies. It isn't the same actress. On the other hand, she also doesn't get to sleep with Castle.
    • In "Slice of Death", the murderer does this to pin the murder on a more convenient suspect. She gets away with it until the very last second as she is leaving the precinct.
    • In "Cops and Robbers", one of the hostages fakes an epileptic seizure to be taken out of the bank before the C4 bomb goes off. In truth, he was the one who planned the whole thing as part of a ploy to learn where his wife and son were hiding.
    • In "Cuffed", one of the criminals pretends to lock herself in a cage to lull Castle and Beckett into complacency before she can tranquilize them.
  • Writers Cant Do Math: It's conceivable that Joe and Vera could still be alive in 2011 having been adults in 1947... but, notwithstanding their nurse, they're clearly far too healthy to be in their 90s.
  • Writing About Your Crime: The episode "Ghosts" has the team discover that the Body of the Week, a fugitive ecoterrorist, was having a True Crime author ghost-write a tell-all about the bombing of an oil tanker in the Seventies. They theorize she was trying to manipulate public opinion ahead of surrendering herself for trial.
  • Wrong Genre Savvy: Played for laughs.
    • Castle likes to latch onto unusual facets of the case and build absurd plots out of them, when the truth is inevitably more straightforward:
    • Castle spends the first few minutes of "Vampire Weekend" running around as if he's actually in a vampire movie.
    • In "A Deadly Game", when "Hans Rowr" is arrested, he claims he'll soon be bailed out by powerful superiors to escape as a Karma Houdini because he's actually just a regular guy taking a 'spy vacation' and thinks the arrest is part of it. When he realizes he's actually blundered into a Police Procedural Murder-Of-The-Week, he's... a bit teary.
    • "Close Encounters of the Murderous Kind": Every single one of his theories points to aliens, and almost gets Beckett to believe it, too. In actuality, it's a murder to cover up espionage.
    • In "Poof! You're Dead" Castle constantly — and incorrectly — assumes that various 'magic story' twists are in effect. Such as his assumption that, on discovering that the victim had a twin brother, they've stumbled into an Evil Twin situation where one twin has murdered the other to steal his life (he hasn't), that a suspect in a wheelchair is faking his condition to cover up the crime (he isn't) or that a magician murdered the victim to prevent his tricks from being revealed (he didn't).
    • In "One Life To Lose", a murder on the set of a soap opera leads Castle to come up with an endless list of over-the-top soap opera style plots as potential theories behind the crime. Which leads to this moment when he comes up with a more plausible one for once:
      Beckett: Wow, Castle, that's... a refreshingly down-to-earth theory.
      Castle: Just trying to keep you on your toes.
    • "Once Upon a Crime" has a murder victim dressed as Little Red Riding Hood. Castle at first starts theorizing that she is Little Red Riding Hood, but after a while comes up with a decent explanation for the victim's attire, to which Beckett responds:
      Beckett: Castle, that is a surprisingly reasonable and grounded theory.
      Castle: Yeah. Frankly, I'm a little bit disappointed in myself.
      Esposito: We all are, bro.
    • In "Hunt", desperate after the case of his daughter's kidnapping has stalled, Castle takes it upon himself to fly to Paris to find and rescue her himself. Unfortunately, despite his desperation he hasn't actually become Liam Neeson in Taken and remains a slightly wimpy milquetoast writer rather than a badass former spy, quickly finding himself out of his depth. Which makes it rather fortunate that his father, and Alexis' grandfather, apparently is a badass former spy...
    • In "Time Will Tell", Castle relishes in a suspect's claim that he's from the future and that he's been sent back in time to prevent the deaths of billions of people. Meanwhile, Beckett is completely certain that the suspect is crazy and that Castle shouldn't indulge his delusions. By the end of the episode, not even Beckett is sure which of them is right.
  • Wrongly Accused: Castle in "Probable Cause". Framed by 3XK.
    • In essence, most episodes have one or two characters who did not commit the murder in question be accused of the crime when taken into questioning (due to circumstancial evidence such as their appearance at the crime scene or the person having had an argument with the victim), only for the person to vehemently deny their involvement in the murder, alibi out and provide useful information that helps (in an any way possible) lead Castle and Beckett and/or Ryan and Esposito to the real killer. In most cases, if the person is accused of the crime before the 50-minute mark of the episode, it's most likely that that person is innocent.
    • Beckett in "Veritas". Framed by Senator Bracken. She actually manages to use this as a way to find what she needs to finally send him to prison.
  • Wrongful Accusation Insurance: In Anatomy of Murder, Greg stole drugs from a hospital smuggled them into a prison enabling his girlfriend to fake a stroke. When she was taken to the hospital they faked her death and escaped. However when it was discovered that there were a lot of discrepancies in her case, they agreed to let her have a new trial with Greg getting off in the case that she was found innocent.
    • Castle himself during the events of "Probable Cause": He breaks himself out of his jail cell to stop the cops from taking him (which would probably have inevitably resulted in his death) using two phony cops of his own; after he's exonerated, Captain Gates tells him his lawyer will probably get that charge reduced to time served.

  • Xanatos Gambit: Jerry Tyler, aka 3XK pulls one off in "Probable Cause".

  • Yandere:
    • In 1x02, "Nanny McDead", the killer ended up being Chloe, who killed her friend because she was sleeping with Ian, and they were in love. Supposedly.
    • In 2x16, "The Mistress Always Spanks Twice", the killer turned out to be the codependent roommate, who didn't want the victim getting married (to someone else).
    • In 3x12, "The Final Nail", the killer was Simon Campbell's new girlfriend, who didn't want anyone getting in the way of her and her boyfriend's love.
  • You Called Me "X"; It Must Be Serious: Castle hardly ever calls Beckett by her first name; it's warranted only for a special, dramatic occasions.
    • Once in "Sucker Punch," when Beckett is fleeing the station after discovering the current case is linked to her mother's murder.
    • The second and third time happen during the two parter "Tick, Tick, Tick..." and "Boom!", when Castle calls her to warn her moments before her apartment explodes and as he searches for her in the flaming wreckage, respectively. He also calls out her name a few more times (five more times, if you want to be precise).
    • Once more in "Knockdown," when Beckett leaves the department in a huff after Captain Montgomery dismisses her from a case linked to her mother's murder.
    • Beckett also calls Castle 'Rick' in "Knockdown". As with the above examples, it's a serious moment where they're letting their guard down and before something particularly dangerous.
    • And Castle calls Beckett 'Kate' in 'Countdown' when she is passing out from the cold and they both might die.
    • The 'Kate' and 'Rick' quotient is upped in "Knockout", culminating in "I love you, Kate" she's in shock after taking a bullet from a sniper.
    • Also occurs with... Kate calling Captain Montegomery 'Roy' before his Last Stand. It's significant because her other mentor, Mike Royce never gets called on a personal first name basis. Only her mother, father, and Castle get that treatment.
    • During Rise, Castle ONLY calls Beckett "Kate". Considering that he is still dealing with the fact that he confessed his love to her, it isn't surprising that he's acting emotionally familiar towards her.
    • In "Kick the Ballistics", Castle calls Ryan by his first name once... at the end of the episode, when he is reassuring him about how he did the right thing.
    • In "Kill Shot," Beckett calls Esposito "Javi" when he's trying to help her past her PTSD. She also calls him "Espo".
    • In "Always," Ryan and Esposito call each other Javier and Kevin when Detective Ryan expresses concern that the team is following the wrong course of action.
      • Castle calls Beckett "Kate" almost throughout the entire episode, except for the last scene. The fact that the person who hears Beckett screaming for help while she's hanging off the edge of a building doesn't call her "Kate" is one of the tip-offs that it isn't Castle. The other is that the hand that catches hers has a ring on it.
    • In "Still", Beckett calls Castle "Rick" for the first time in a good long while when she tells him that she loves him, shortly before he's forced to leave her alone on top of the pressure bomb she's trapped on.
    • Castle always calls Martha "Mother". At the end of "Hunt" he calls her "Mom". Presumably this leads to a serious off camera discussion about his father.
  • You Do Not Want To Know: Inverted in "Heartbreak Hotel." Ryan and Esposito try to explain why they're wearing Elvis costumes, but Beckett decides she doesn't want to know.
  • You Have Outlived Your Usefulness: In "Cops and Robbers", the bad guy of the week sabotages the C-4 of his mercenaries once their job was completed.
  • You Have No Idea Who You're Dealing With: Beckett tries this in "Always". Subverted in that the encounter ends with Beckett hanging off the side of a building, and the perp telling her, "Actually, we know exactly who we're dealing with." Which has a double meaning as they've found out just who the guy is that's protecting Beckett.
  • You Killed My Mother: The overarching mystery of the series is who killed Beckett's mother Johanna and why. Turns out it was the corrupt and powerful Senator William Bracken, who had her killed after she unearthed some of his skeletons.
  • You Need to Get Laid: In the early seasons particularly, one of Lanie's most frequent pieces of advice to Beckett is that she needs to "get her freak on with writer-boy" as soon as possible.
  • Your Mom:
    • During the outtakes, Jon Huertas apparently screwed up his line and this happened:
      Nathan Fillion: You've got one line.
      Jon Huertas: Your momma has one line.
    • Comes up again in "Knockdown", when Ryan is being tortured and Esposito has to watch:
      Esposito: OKAY!
      Ryan: Don't tell this jackhole anything.
      Esposito: I'm sorry, bro, I can't watch this. [to interrogator] Listen to me! You're too late—the cops already know all about... me and your mom.
  • Your Princess Is in Another Castle!: One of Castle's main skills appears to be spotting where these moments are coming up.
    • He keeps investigating the case in the pilot precisely because his writer's sensibilities (along with those of James Patterson and Stephen J. Cannell) are offended by the "easy" solution to the mystery (he even tells Beckett "the reader would never buy it!"). This occurs exactly half-way through the episode.
    • He gleefully brings Beckett to the "wrong castle" in "Hell Hath No Fury," bringing her attention to the perfect suspect (an enemy of the victim who owned a hotel that used the exact same rug the victim's body was wrapped in) before pointing out that he'll obviously have an alibi because he's a Red Herring. Beckett is irritated throughout the whole ordeal.
    • In "The Mistress Always Spanks Twice," it happens in the last 5 minutes of the episode.
    • In "Boom!", he's able to sniff out a trap due to this very reasoning.
    • In "Setup", Castle is pretty much the only one who believes that the supposed Syrian terrorists are in fact innocent scapegoats being set up by a third party, and Beckett is the only one who'll hear him out. He turns out to be right.
    • In "Slice of Death", the drug kingpin behind all the murders is only caught at the last second as she leaves the police station.
    • In a peculiar twist, Beckett is the one who has this realization in "Recoil". After the prime suspect is arrested for an assassination attempt on Senator Bracken, she realizes that the bomb that would have been used was expertly made, and that the mentally handicapped suspect could not have made that. She stalls the senator's keynote speech despite not having concrete evidence, and at the last second, is proven right and barely makes it in time to save the senator from the bomb in his limousine.
    • As to Castle's rather uncharacteristic failure to notice, even telling Beckett it is open-and-shut, it is likely it was deliberate in an attempt to let Bracken die. He even admits to Bracken that if he were in Beckett's shoes, he would have let him die.

  • Zany Scheme:
    • Castle comes up with a fairly straightforward one in "Heartbreak Hotel." Results in Castle, Ryan, and Esposito sneaking into a casino from which they'd been barred in Elvis impersonator costumes.
    • Played with in "The Limey". Castle's plan is outlandish even for Castle, but Beckett cuts him off with a plan of her own. She'll get the fingerprints the easy way... by gatecrashing an exclusive dinner reception at the British Embassy.
  • Zorro Mark: In "Heroes & Villains", the vigilante Lone Vengeance carves an 'L' into the butt cheek of a mobster with a sword.


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