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6The story involves a mystery where someone has committed a crime or misdemeanor of some sort, and neither the protagonists nor the audience are supposed to know who the guilty party is. However, TheLawOfConservationOfDetail and the rules of FairPlayWhodunnit state that the culprit must be a character who appears in the story before TheReveal. It can't be someone the audience has never seen before, and if the mystery is a big part of the plot, it can't really be a minor background character either. It has to be someone important.
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8In {{Fair Play Whodunnit}}s and many other types of MysteryFiction, the writers usually introduce several potential suspects to the crime, and in the end one of them is found to be guilty, while the others turn out to be mere [[RedHerring red herrings]]. However, in some pieces of fiction (typically ones where the mystery isn't the main driving force of the plot), there are no red herrings, and the audience can rather easily deduce the culprit, since they're the only possible major character who could have done it. Either there are no other significant characters among the suspects, or all the other major characters can be ruled out because they're the protagonists, series regulars (in the case of serial media), or other types of characters that aren't typically used as a culprit, such as kids or animals.
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10Of course, even if the audience can guess who did it, it isn't as easy for the protagonists to solve the mystery, since for them the guilty party could be any minor character, or even someone who doesn't appear in the story at all. It's only the audience who can rule these people out.
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12If the writers don't care about the rules mentioned above, they can make the culprit turn out to be [[TheDogWasTheMastermind some completely unexpected minor character]], or even [[StrangerBehindTheMask someone we've never met before]], but these kind of mysteries tend to be much rarer (and more [[AssPull unsatisfying]]) than the ones that follow the rules.
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14This trope can overlap with ChekhovsGunman, if the guilty character doesn't seem to have any proper function in the story before TheReveal. Contrast this trope with NarrowedItDownToTheGuyIRecognize, where the viewers can guess the culprit not because he's the only suspicious major ''character'', but because he's the only one played by a major ''actor''.
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16Warning: the examples below contain '''spoilers'''... Though, perhaps, rather [[CaptainObviousReveal obvious]] ones.
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18!!Examples
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22[[folder:Anime and Manga]]
23* ''Anime/AttackOnTitan'': The female Titan is [[spoiler: Annie Leonhart]]. Armin figures out that she's another human-shifting Titan almost as soon as she appears, but her true identity is a mystery for most of the first season. What makes it obvious is that we know from Eren Yeager's transformation that the Titan form shares certain features with their normal human form (such as hair color). The female Titan is blonde, and there are only two blonde women of note on the show: Krista and [[spoiler: Annie]]. Krista was shown to be elsewhere during the female Titan's attack, so that just leaves [[spoiler: Annie]].
24* In the early Android Saga of ''Manga/DragonBall'', Bulma turns out to be the mother of KidFromTheFuture Trunks. There are a number of clues to this (they have the same hair color in the manga, he shares her FamilyThemeNaming, he wears the logo of her father's company on his jacket), but the thing that turns it into this trope is that when Trunks was introduced, between Chi-Chi getting married and Launch [[ChuckCunninghamSyndrome vanishing forever]], she was the ''only'' named unwed female character who'd appeared in the manga in about three years. In fact, this [[DerailingLoveInterests caused some issues]] since this meant Bulma was the only preexisting character who could romance Vegeta, resulting in a rather abrupt timeskip hookup.
25* ''Manga/IsTheOrderARabbit'': Syaro and Rize speak to their high school classmates to unravel the mystery of "Miss Emerald", a recent alumnae who was able to ace every club she joined during her time at the school. By an ''amazing'' coincidence, it turns out to be the only twentysomething female character in the series.
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28[[folder:Comic Books]]
29* ''ComicBook/FantasticFour'': In the 1982 all-comedy issue ''ComicBook/TheFantasticFourRoast'', the team is being feted at a celebrity roast with everyone in the Marvel universe in attendance. But a mysterious figure is out to sabotage the proceedings and after numerous attempts, Ben "The Thing" Grimm says that the only other person besides Reed smart enough to ruin the party is ComicBook/DoctorDoom. However, Doom approaches the dias and [[NotMeThisTime pronounces his innocence.]]
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32[[folder:Film]]
33* In ''Film/CaptainAmericaTheWinterSoldier'', Steve Rogers sets out to discover who has ordered the attacks on both him and Nick Fury. Only one plausible suspect is shown, [[spoiler:Alexander Pierce]], especially after he makes several vaguely ominous statements like "[[UtopiaJustifiesTheMeans to build a better world sometimes mean tearing the old one down]]". Perhaps in awareness of this, the film makes little attempt to disguise [[spoiler:Pierce]] as the culprit and it only takes five minutes after he and Steve meet for him to become a visible antagonist. The only reason that savvy viewers might be surprised is because [[spoiler: Creator/RobertRedford]] is [[PlayingAgainstType not known for]] playing bad guys.
34* In ''Film/DieAnotherDay'', we find out there's a [[TheMole mole]] inside the [=MI6=] who has, among other things, informed the bad guys who Bond is. Now, obviously the mole can't be Bond himself, nor M or Q or Moneypenny, as they are all mainstays of the [[Film/JamesBond franchise]]. Besides them, there is only one other major [=MI6=] character in the movie, who -- surprise, surprise! -- does turn out to be the mole.
35* During the second half of ''Film/StarTrekVITheUndiscoveredCountry'' it turns out there's a traitor [[spoiler:among the Enterprise crew]], but no one knows who it is. Since it's obvious they're not gonna make any of the series regulars have a FaceHeelTurn after three TV seasons and five movies, there is only one major character available. Yeah, you guessed it, it's [[spoiler:Valeris]]. This might have been a more interesting had the character been Saavik from Film/StarTrekIITheWrathOfKhan, who the traitor was written in as a replacement.
36* ''Franchise/StarWars: Film/TheRiseOfSkywalker'' introduces a spy within the First Order who leaked vital information to the Resistance, enabling them to launch a counter strategy in time to clinch victory against [[spoiler:Palpatine]]. There's not enough time between the movies for any known allies of the Resistance to infiltrate the First Order as a mole (''TROS'' is set only a few months after ''Film/TheLastJedi''), and the only First Order members of any significance are [[spoiler:Kylo Ren and General Hux]]. Since [[spoiler:Kylo]] is apparently working for [[spoiler:Palpatine]], it leaves [[spoiler:General Hux]] as the only possible candidate for the mole, [[spoiler:especially since his animosity with Kylo does give him a motive to want to see his reign end]]. Suffice to say, he does end up revealing himself to be the spy.
37* In ''Film/ThrowMommaFromTheTrain'', When Owen asks Larry why he thought Owen's mystery story was too obvious, Larry explains that it is a three page story with two characters, one of whom dies on page 2.
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40[[folder:Literature]]
41* Literature/HarryPotter: "RAB" is [[spoiler: Regulus Black, Sirius' dead brother]]. He's a fairly obscure character who'd only been mentioned in passing a couple of times prior to the reveal, so it probably ''would'' have been hard to figure out... Were it not for the fact that there are no other characters in the series with those initials (well, his middle name wasn't known, but guessing it wasn't too hard when given his family's ThemeNaming). SpoiledByTheFormat was also an issue, as foreign versions of the books that changed the character's name had to change the initials accordingly.
42* When writing the Literature/LordPeterWimsey book ''Five Red Herrings'', Creator/DorothyLSayers said that people had complained that her previous book ''Strong Poison'' had only had one possible suspect for the murderer -- as had two of her previous books, ''Unnatural Death'' and ''The Documents in the Case''. So she wrote ''Five Red Herrings'' with the view that if people wanted to play whodunnit rather than howdunnit, she was prepared to indulge them this one time.
43* In Creator/WilkieCollins's "My Lady's Money," [[spoiler:Felix Sweetsir]]--he is the only person with a motive to steal the money.
44* In "The Pliable Animal" by Creator/HarryHarrison, a prince is murdered on a planet with the strictest possible ThouShaltNotKill policy... [[spoiler:for everyone but the king, whose duties include performing the occasional MercyKill on trapped dangerous predators]].
45* ''Literature/TheScarletLetter'' has two major male characters -- Hester Prynne's long-lost husband who only recently returned, and the Reverend Arthur Dimmesdale. The reveal of whom she committed adultery with is not terribly shocking.
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48[[folder:Live Action TV]]
49* In the ''Series/DoctorWho'' story ''[[Recap/DoctorWhoS14E3TheDeadlyAssassin The Deadly Assassin]]'', the President of the Time Lords is assassinated, and the Doctor framed for the crime. The only suspect who gets any significant amount of screen time is [[spoiler:Chancellor Goth]], one of the candidates-in-waiting for the Presidency, and he turns out to be the real assassin.
50* Season 3 of ''Series/TheFlash2014'' introduces a new masked villain, "Dr." Alchemy. It also introduces one new supporting character: [[spoiler:Julian Albert, an unsympathetic crime-scene investigator who seems to be obsessed with metahumans]]. Guess who Dr. Alchemy turns out to be. However, in a twist, [[spoiler:[[TheKillerInMe he doesn't even realize he is Dr. Alchemy]], and is GoodAllAlong]].
51* Towards the tail end of ''Series/TorchwoodMiracleDay'' we're told there's another evil {{Mole}} in the CIA other than the ObviouslyEvil, FatBastard that was outed earlier. There are three CIA operatives that aren't part of the main cast. One is DaChief and working pretty diligently with Torchwood and wants the case solved and the mole outed. The other is developing the software to find the mole. That leaves the last one, who was [[spoiler:featured prominently in the first episode, who we had just been reminded exists the episode prior, and who just had her wardrobe change up to low cut cleavage showing dresses]]. To be fair though, the audience is let in on it before the heroes, who were busy juggling the IdiotBall the entire season.
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55* Subverted in ''Theatre/{{Sleuth}}'' (as well as its movie adaptations): the first half of the story features only two characters, and when one of them disappears under suspicious circumstances, it would seem the other one has killed him. [[spoiler:But it turns out he never disappeared at all, and the policeman investigating the case is actually the "missing" character in disguise.]]
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58[[folder:Video Games]]
59* ''VideoGame/AssassinsCreedValhalla:'' The head of the Order of Ancients in England is a mystery right up until the absolute last mission of the main game, where it turns out to be [[spoiler:King Aelfred]]. Except by that point Eivor's killed pretty much every other antagonistic NPC, and introducing a new character at the last second wouldn't make a whole lot of sense, never mind the trailers ''showed'' they were affiliated with them. [[spoiler:But it does hide the major twist; he was working to destroy the Order from within.]]
60* ''VideoGame/BlightDream'': There are only two main characters, and thus only two suspects for the identity of the SerialKiller; of those two, Michiru's brother Yuu is so blatantly set up to be the killer that [[NeverTheObviousSuspect it becomes obvious he can't possibly be guilty]], leaving only Michiru herself, who is established at the beginning of the game as having anterograde amnesia (she forgets her memories of each day past her car accident), which anyone familiar enough with mystery fiction will recognize as setting up an [[TheKillerInMe amnesiac killer]] twist.
61* ''VideoGame/FiveNightsAtFreddysSecurityBreach'' introduces a villain named Vanny, a woman in a rabbit costume. The franchise's list of characters who could fill that costume is not particularly long, and one of them (who also appears in the game, and was established in a prior game to have been possessed by the franchise's main ArcVillain) happens to be named "[[spoiler:Vanessa]]."
62* ''Franchise/FireEmblem'':
63** ''VideoGame/FireEmblemPathOfRadiance'' has a subplot about a [[TheMole spy]] in Ike's army, who is eventually revealed to be [[spoiler:Nasir]]. This would probably be a lot harder to see coming if he didn't meet the heroes right around the time Ashnard mentions getting a spy into Ike's group and then continue to follow them around long after having fulfilled his original deal with them for no clearly stated reason. GenreSavvy players might also be able to pick him out just based on the fact that he's not a playable character at that point in the game, so nothing will be lost gameplay-wise if he betrays you.
64** [[spoiler:Zelgius]] is the BlackKnight. He's well known as a master swordsman and one of the greatest generals in the world, he's the right build to fit in the knight's very large armor, he uses the General/Marshall class (which the Black Knight's unique class is a modification of) and even shares some of the Knight's otherwise unique animations in cutscenes. Like [[spoiler:Nasir]] above, he isn't a playable character. All of this by itself isn't necessarily damning, but when you combine it with the fact that there's no other viable candidates, it becomes really obvious.
65** Bertram is [[spoiler:Renning]]. His helmet doesn't cover his mouth, and there's not a lot of other characters with green goatees.
66** In ''VideoGame/FireEmblemTheSacredStones'', you have the traitor in Ephraim's army. There are four candidates, and you start knocking out suspects fast: it can't be Ephraim, obviously, and Forde and Kyle are the [[RecurringElement red-and-green cavaliers]], who are always a duo. That leaves Orson, who not only fails to fit any obvious character archetypes, but is also significantly stronger and higher-level than everyone else. Not to mention, there's already a character who fills the CrutchCharacter role in Seth, who is severely overpowered--and Orson is even stronger than Seth, which makes it feel very unlikely that the game would give you such a strong unit with no strings attached. And when it's mentioned that Orson went off alone on a scouting mission, that pretty much clinches it.
67** The identity of the Death Knight in ''VideoGame/FireEmblemThreeHouses''. Jeritza is always absent whenever he appears, stops showing up once the Death Knight becomes a known target, rarely interacts with anyone else, isn't available for faculty training and, pre-patch, was one of the only teachers not in the support log. (Implying they won't be playable on any route) The real twists aren't Jeritza is the Death Knight, but that [[spoiler: he's also Mercedes' half-brother Emile]], [[spoiler: it's possible to ally with him on one route]] and, after being PromotedToPlayable in a patch, that [[spoiler: the Death Knight isn't Jeritza's alter-ego but his SplitPersonality, and he isn't in control of his actions in that state.]]
68* The BigBad of ''VideoGame/MasterDetectiveArchivesRainCode'' becomes rather obvious because there's only one possible HiddenVillain regarding [[EvilInc Amaterasu Corporation itself]], as the obvious villain, Yomi Hellsmile, has long been introduced: [[spoiler:Makoto Kagutsuchi, who is its CEO, and is the only one addressed as a DevilInPlainSight out of all of the major cast members.]]
69* TheMole in ''VideoGame/Persona5'' is very easy to guess simply from the fact that they have a [[RelationshipValues Confidant]] that automatically ranks up during the story, and because they're the one party member who never got much attention in pre-release marketing. [[spoiler:This may have been to disguise the ''real'' twists: the Phantom Thieves [[TomatoSurprise knew Akechi was a mole from the start]], and the whole thing was a setup by a third party.]]
70* The ''VideoGame/MegaManBattleNetwork'' series often falls into this trope. Whoever is behind the [[MonsterOfTheWeek cyber-attack of the week]] can easily be narrowed down to [[TheLawOfConservationOfDetail the NPC with the unique portrait.]] The Netopia arc in ''VideoGame/MegaManBattleNetwork2'' is especially guilty of this, as Princess Pride fakes her own death to throw off suspicion but is still the only NPC in the castle with a unique portrait ''and'' a named Net-Navi you haven't fought yet.
71* '''VideoGame/StarWarsJediFallenOrder'': The Second Sister is [[spoiler: Trilla Suduri, Cere's former padawan]]. Despite her mask and armor, it's pretty obvious the Second Sister is a human woman and former Jedi, and other than Cere herself, [[spoiler: Trilla]] is the only one to be mentioned in any significant capacity. Her supposed death is also described pretty nebulously prior to TheReveal.
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75* ''Franchise/AceAttorney'' cases with a small pool of suspects often end up falling into this. While this usually only happens with early cases, where [[ReverseWhodunnit the killer's identity is never meant as a twist to begin with]], later cases can end up like this too.
76** Lotta Hart [[LampshadeHanging outright acknowleges this]] in Case 2 of the second game, pointing out during the investigation that since every other potential suspect had an airtight alibi at the time of the murder, if Maya wasn't the killer then it must have been [[spoiler: Ini Miney]].
77** Case 4 of the second game plays with this. An assassin committed the murder, so you're looking for the one who hired him. Besides the assassin and the defendant, Adrian Andrews is the only non-recurring character in the case. Sure enough, when put on the stand her story has numerous holes. The twist is [[spoiler: your client is guilty as sin, Adrian is innocent. The reason she looks so suspicious is that she tried to [[FramingTheGuiltyParty frame the guilty party.]]]]
78** Case 4 of ''Investigations 2'' is a classic example, there are only three people involved in the case who aren't recurring characters, one of them being an old lady who almost certainly didn't have the strength to commit the crime, another being the old lady's granddaughter, and the third being ''extremely'' ObviouslyEvil ''and'' adamant about pinning the crime on Kay Faraday. The game does try and set up Justine Courtney as a plausible suspect briefly, but she quickly points out that the evidence shows there's no way she could've done it. Sure enough, the ObviouslyEvil character did it. [[spoiler: And both the old lady and her granddaughter were accomplices via his bullying and blackmail.]] Though the real twist is just how far the culprit's villainy extends.
79** The DLC case of ''Spirit of Justice'' has only three witnesses besides the defendant: recurring ButtMonkey Larry Butz, the defendant's NiceGuy fiancé, and the doctor Pierce Nichody. The fiancé being the killer would be too dark for a BreatherEpisode like this, so Pierce is the only viable suspect as he's the only one who could've done it and still allow for a happy ending.
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82[[folder:Western Animation]]
83* ''WesternAnimation/BatmanUnderTheRedHood'' opens with the Joker killing Jason Todd and then introduces the Red Hood in the next scene (which takes place years later). Batman spends the middle portion of the film trying to figure out who the Red Hood is, but literally all of the film's major characters other than the Red Hood are shown fighting and/or talking to the Red Hood, so even a viewer who's not familiar with the comics will probably figure out that [[spoiler: the Red Hood is a resurrected Jason Todd]] before Batman does. There's also just the question of "why would they show us this apparently-unrelated death scene at the start of the movie if it wasn't going to be important later?"
84* In the ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' episode "Rarity Investigates", Rainbow Dash gets framed for a petty act of treachery so that she won't break the long distance speed record. There's only one non-recurring character in this episode: Wind Rider, the holder of said record.
85* This trope is used frequently in various versions of ''Franchise/ScoobyDoo''. Subverted in one episode of ''WesternAnimation/WhatsNewScoobyDoo'', though: the crook in "It's All Greek to Scooby" turns out to be [[AnticlimacticUnmasking some random person the gang has never met beforehand]]. Velma naturally is rather displeased and keeps insisting her theory about who was the monster was at least plausible. Averted for the audience, however- this individual had actually appeared in the episode's ColdOpen.
86* ''[[WesternAnimation/AMatterOfLoafAndDeath Wallace & Gromit: A Matter of Loaf and Death]]'' opens by setting up that a SerialKiller targeting bakers is on the loose. Shortly after that the audience is introduced to Piella. Considering that this series is a heavy user of both MinimalistCast and WorldLimitedToThePlot, there's no points for guessing who the serial killer is.
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