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[[quoteright:350:[[Film/{{Clue}} http://static.tvtropes.org/pmwiki/pub/images/clue_1985.jpg]]]]
[[caption-width-right:350:[[MeaningfulName Mr. Boddy's]] role had been revealed.]]
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->''I know I'm human. And if you were all these Things, then you'd all just attack me now, so some of you are still human.''
-->-- '''R.J. [=MacReady=]''', ''Film/TheThing1982''

A group of people are invited to attend a get-together, usually held at an OldDarkHouse often in the middle of the lush countryside or (more recently) on someone's [[IslandBase Private Island]], by a mysterious and/or eccentric host. Suddenly one of the guests (or even the host) is murdered and [[ClosedCircle circumstances]] [[DiabolusExMachina prevent the others from leaving]], usually a heavy storm or a cut bridge, or even both.

Our heroes soon learn that one of their party is actually some manner of villain (typically TheMole, though a random escaped criminal is not unheard of), but, for various contrived reasons, that's all the information they're going to get. So it's up to them to work out which of their supposed colleagues is really TheMole before he can kill them all. And [[DividedWeFall you can't trust anyone until you do]]. Luckily, however, there's (usually) only one mole involved.

Often results in everyone being LockedInARoom. This can be self-imposed, as our heroes can't chance TheMole reporting back to headquarters, but a character may force this upon everybody, which will usually raise everybody's tension. Circumstances will always contrive to prevent our heroes from getting in touch with the outside world to find out who TheMole is, which may range from the aforementioned storm knocking out the telephone poles, to someone cutting the telephone lines, to outright smashing all the phones to pieces. [[AHouseDivided Accusations are hurled]], secrets are uncovered and more murders are committed as the DwindlingParty tries to determine who is the murderer in their midst.

General outcomes of this plot:

* A: One person will seem to actively hinder the investigation. He'll drop the radio, breaking it just before a description of TheMole is broadcast. He'll have a panic attack at a critical moment endangering the group. He'll be suspiciously uninformed about whatever his job is supposed to be. This person is ''never'' TheMole. [[RedHerringMole He's just an idiot.]] (See HanlonsRazor.)
* B: One person knows his job well, but he's a little high-strung. He accuses a lot of people of being TheMole on shaky grounds. If it doesn't turn out that ''he's'' the Mole (which is a little too obvious, and therefore rare), odds are [[AcquittedTooLate the real Mole's going to kill him]].
* C: One person is very competent and helpful. He'll even have some extra skills that are handy for just the room in which they are locked. He might even find clues as to TheMole's identity. At some point, he'll save the hero's life. He's TheMole, and he's really very good at it.
* D: The idiotic RedHerringMole turns out to be a spy for the good guys. He's been keeping it a secret since, like everyone else, [[DividedWeFall he's not entirely sure that the mole isn't one of the heroes]]. His apparent incompetence is really ObfuscatingStupidity, and he's trying to goad the ''real'' Mole into tipping his hand.
* E: There's a ''second'' mole--perhaps even one that [[RightHandVersusLeftHand the first mole doesn't know about]].
* F: ''None'' of them are TheMole: the initial message was a fabrication by the bad guys to make [[DividedWeFall the heroes turn on each other]].
* G: None of ''them'' are TheMole: the hero has been hypnotized to act as mole [[ManchurianAgent without even his own knowledge]], or is simply an UnreliableNarrator.
* H: TheMole successfully frames someone else.
* I: ''No one'' is TheMole: for whatever reason, everyone's paranoia has spiraled completely out of control, causing them to attack each other on otherwise flimsy pretexts or misinterpreted accidents. Or the host, with the help of his staff and/or associates, faked it all to "entertain" his guest.
* J: Someone dies early, but they NeverFoundTheBody, or it was mutilated too badly to be positively identified: they are probably the Mole.
* K: No one is TheMole; the plot fits the DwindlingParty twist, wherein the villain is someone else who simply kills most of the main characters, one by one and usually in a extremely brutal and sometimes grotesque manner. Perhaps the villain is a demented, deeply troubled individual, or is a stalker who enjoys killing; maybe he is a crime lord who fears being caught (and his method(s) of murder and carrying the killings out is used to put fear in others and/or intimidate the authorities)...or he is simply the face of evil (who also hopes to intimidate the heroes and scare off the authorities). Once the original gang is whittled down to just two or (at most) three, the villain is finally defeated; either the bad guy is killed, usually by falling into one of his own traps or another character--often but not always one thought to be dead--arriving to defeat him, the remaining protagonists are able to beat down the villain and subdue him until the authorities arrive to arrest him; or (most commonly on TV crime/action shows) the title character arriving JustInTime before the villain kills the last remaining members of the group.

In a well-done example, the audience will work out who TheMole is only seconds before the heroes do, though they'll typically be led to an [[RedHerringMole incorrect guess]] from early on.

Non-recurring characters are subject to being killed off one-by-one by TheMole. Of course, strictly speaking, no one is above suspicion, even our heroes, and at least one member of the group will panic, accuse the heroes, and run off to a certain demise. The audience (usually) knows better.

Named after the 1939 Creator/AgathaChristie novel formerly titled ''[[Literature/AndThenThereWereNone Ten Little Niggers / Indians]]''.

Often the ''modus operandi'' in a ReunionRevenge. Occasionally a FinalGirl or other survivor(s) may be spared, but if the writers are really bloodthirsty, it only ends when they KillEmAll (or, if you're at the beginning of the series, EverybodysDeadDave); if they're feeling devious, they may also throw in a few instances of SuspectExistenceFailure. Newer Installments May have This Combined With/Be the byproduct of a DeadlyGame Or a HuntingTheMostDangerousGame Scenario. Don't be surprised if a MexicanStandoff or two pop up, especially for the finale.

This trope goes together with AHouseDivided like Peanut-butter and Jelly.


[[folder:Anime and Manga]]
* In ''Manga/AstraLostInSpace'', one of the pressing mysteries is the possibility that one of the nine kids in the group is a traitor, who cut the communication devices on the ship they landed in. [[spoiler: Though they may have cut it for a good reason.]]
* In Episode 5 of ''Manga/AzumangaDaioh'', Osaka imagines one of these happening at Chiyo's summer home:
-->'''Osaka:''' And then it turns out...I'm the killer!
-->'''Yomi:''' Why do ''you'' get to be the killer?
* One arc of the manga ''Manga/BlackButler'' follows this trope's description to the letter, complete with large, dark mansion, gathering of wealthy guests, and the raging storm that means no one gets to go home. (And Ciel is most definitely fitting enough for the role of "mysterious host".) [[spoiler:It turns out to be some bizarre, mind-boggling combination of E and I and involving one of the "victims" faking his own death]].
* One of the filler arcs from ''Manga/{{Bleach}}'' featured this. Ichigo's group of friends have to get through a series of games, one of which involves a member of their group being kidnapped and replaced by an shapeshifter. [[spoiler:It turns out to be Chad]].
* In volume 30 of ''Manga/DetectiveConan'', {{Captain Ersatz}}es of famous detectives were invited to an abandoned mansion and die off one by one. [[spoiler:Only one of them actually died. The rest faked their deaths once they deduced who the real killer was in order to PullTheThread on her]].
* The manga ''Manga/{{Doubt}}'' was a version of this, but with [[spoiler:hypnosis--the real killer hypnotizes another and has her confess, then escapes]].
** The sequel/spinoff, ''Manga/{{Judge}}'', does this as well.
* In a chapter of ''Manga/FrankenFran'', Fran is invited by former patients for a party in a remote location. Soon, they are attacked one by one--hopefully, Fran can save them. This being ''[[{{Gorn}} Franken]] Fran'', the truth is far more disturbing than expected. [[spoiler:Even Fran finds it disturbing]].
** The answer? [[spoiler:The victims are doing it to themselves because they get off on Fran operating on them]].
* The first ''Anime/GallForce'' does this without the murders. Each cast member is offed by differing circumstances as they try to make their way to the planet Chaos. [[spoiler:The mole was [[RobotGirl Catty]], but she was only trying to arrange for one of the others to get a FaceFullOfAlienWingWong in the name of galactic peace, and didn't actually try killing anyone. She [[HeroicSacrifice sacrifices herself]] halfway through to let the other survivors get to an escape pod.]] A self-parody short of the entire series is even titled ''Ten Little Gall Force''.
* In the Lone Island Syndrome episodes of ''LightNovel/HaruhiSuzumiya'' the SOS Brigade goes on a club field trip to an island mansion specifically set up to stage a murder mystery like this, in order to stop Haruhi from generating one herself (though it's left ambiguous at the end whether or not she's already created an external killer).
* Moto Hagio's ''Manga/TheyWereEleven'' has this happening during a survival test where ten students are stranded on a derelict spaceship...so why are there eleven of them? Everyone knows that one of them shouldn't be there as accidents keep happening, and the hero has the additional problem of fitting the "competent and helpful" rule of Mole detection above--as the other students begin to notice. [[spoiler:EverybodyLives. The extra examinee was an instructor sent in as TheMole to cause trouble and force the group to quit the test, as a SecretTestOfCharacter for all of them; things got out of his control. The hero's suspicious knowledge of the ship was because he was unknowingly a survivor of the disaster that originally destroyed it]].
* ''Anime/UruseiYatsura'' had an anime only episode where the group was killed off one by one till only Ataru was left [[spoiler:In the end, it turned out the murders and complicated reveal of a killer with Ataru's face were a complicated plan by the perfectly unharmed victims to "Fix" Ataru's personality. The ending makes it pretty clear that Ataru saw through it at some point and proved to be a better actor than they had realized]].
* ''Anime/{{Danganronpa 3}}'' features a DeadlyGame as a major part of its plot, where 16 people are locked inside a building, while being periodically rendered unconscious. While everyone is unconscious, the mole kills someone. If for whatever reason they cannot, the game ends. It turns out the mole is [[spoiler:... it's not quite so simple as saying "it's this person". While everyone is unconscious, one person at random is awoken, and brainwashed into killing themself. Thus, everyone is the mole.]]

[[folder:Board Games]]
* The entire premise of the board game ''TabletopGame/{{Clue}}'', as well as TheMovie based on it. The film involved a group of guests with questionable pasts being locked inside a mansion trying to figure out who killed Mr. Boddy. Every single one of them had a motive to kill him, and things aren't helped when the rest of the mansion's staff begins falling like flies...
** The board game didn't initially include the element of the suspects being killed, but later releases did, adding a deck of cards that included eight clock cards: once the first seven had been drawn (and taken out of the deck), whoever drew the eighth card was killed by the murderer (presumably if the killed character is actually the murderer, they just faked their deaths instead) and the card was then returned to the deck.
* Parodied in the board game ''KillDoctorLucky'', by Cheapass games, the objective of which is to be the first to bump off the good Doctor. The players all despise Doctor Lucky, and have been invited to his country mansion for the weekend. In the words of the game "There's a howling storm outside, it's midnight, and someone just shut off the lights..."

[[folder:Children's/Party Games]]
* "Ten Little Injuns" and numerous adaptations. The original "Ten Little Injuns" began as a minstrel song written by Septimus Winner in 1868, and describes a group of 10 Native Americans (here called by the derogatory term "injun") and, as different events happen--most of them dying of various circumstances--eventually decreasing down to one. The lone survivor ends up married. Various adaptations involve anthropomorphic animals (usually for family-friendly children's adaptations, although several of the original 10 still die or disappear of ambiguous circumstances), teddy bears and dolls, people (most often soldiers) and--in the racial sense--minorities.
* [[http://en.wikipedia.org/wiki/Mafia_(party_game) Mafia]]-[[TabletopGame/TheWerewolvesOfMillersHollow style]] games often run into this, as the town's objective is to hunt out the "mafia" from their midst. Many is the game where a last lynch leaves two town players or a last kill means the sole surviving mafia member.

[[folder:Comic Books]]
* Parodied/subverted in a ''Magazine/DoctorWhoMagazine'' comic strip, in which a group of minor villains that the Doctor has previously defeated gather together in a deserted space-station to plan a final attack that will finish him once and for all. One of them dies horribly, and as the others begin dying one by one afterward, it seems (to them, anyway) as if the Doctor has infiltrated their midst in disguise and is picking them off one by one. Finally, the last couple--paranoid that either one of them could be the Doctor in disguise--kill each other...and at that point, the Doctor arrives, not recognizing any of them. Turns out the first death was just an accident with a faulty machine and the other deaths were just everyone picking each other off out of sheer paranoia.
** Played straight in an earlier Eighth Doctor strip.
* Happens to the Club of Heroes in "[[ComicBook/GrantMorrisonsBatman The Black Glove]]" arc in ''Franchise/{{Batman}}''.
* In the first ''ComicBook/{{Blackhawk}}'' comic published by DC, one of the stories concerned the Blackhawks being mysteriously incapacitated one by one--not killed, but sidelined, hospitalized for a day or two. It turned out to be [[spoiler:a publicity stunt by a movie studio, intended to drum up interest in their upcoming movie "Ten Little Indians"]].
* This is the premise for ''ComicBook/TheRedTen'', Red is the World's Greatest Detective and she's found murdered. So her team-mates, the Alliance go hunting for her killer Oxymoron. Which leads them to an island where the Alliance's darkest secrets are revealed and they get killed off one by one for their crimes.

* This trope is ''the'' most popular mystery outline for ''any'' fanfiction category (there are even fanfictions under the trope namer's category using original characters for the plot) thus making any possibility of listing all examples ludicrous.

* ''Film/{{Devil}}'': In an elevator. One of them is the Devil.
* ''Film/HouseOfWax2005'': The 2005 version features six college-age students traveling to the big game, when they stop in a rural Louisiana town to camp for the night. One by one, each of the six are targeted by a pair of brothers running the town's museum...and four of them are killed in the most violent of manners. (The two survivors later discover that most of the town's inhabitants have been killed by the brothers through the years, and have to escape the town before they're next.)
* ''Film/MurderByDeath'' is the AffectionateParody of the genre; here, the guests are thinly-disguised versions of famous fictional detectives. The trope is subverted when it turns out the villain isn't really interested in killing them off, but in embarrassing them instead.
* ''Film/{{Alien 3}}'', which has been described as "''Literature/AndThenThereWereNone'' [[RecycledInSpace in outer space]]" by Entertainment Weekly, had the entire population of Fiorina 'Fury' 161, save for one prisoner (Morse), killed off by the xenomorph that had infiltrated the prison. [[spoiler:This includes Ellen Ripley herself, who died as a combined result of the chestbursting chewing its way out of her, and a suicide dive into the prison's metalworks]].
* ''Film/AprilFoolsDay''. There's even little dolls representing the guests, prompting one to say that it's "like something from Creator/AgathaChristie".
* By the end of ''Film/TheLadykillers'', the robbers have all killed one another except the Professor, who is struck on the head by a railway semaphore. Little Mrs Wilberforce is left with all the "lolly".
* The film adaptation of ''Film/{{Clue}}'' was essentially a gigantic parody of this trope.
** The last one of the three alternative endings subverted the trope by revealing that [[spoiler:everyone ''except'' TheMole was a murderer.]]
** [[spoiler:And TheMole was an FBI agent who kills the man who set the whole thing up at the end.]]
* The Bollywood movie ''Gumnaam'' is an uncredited remake of ''Literature/AndThenThereWereNone''.
* The bank robbery in ''Film/TheDarkKnight'' might be considered a high-speed variant of this, as one robber after another kills an accomplice, then is killed in turn. Unique in that it takes place ''at the scene of another crime in progress'', and the guy who figures out what's going on ("Let me guess: you're supposed to kill me?") is immediately killed.
* The '80s version of ''Film/TheThing1982''--and the short story both versions were based on, "Literature/WhoGoesThere"--both combined this trope with TheVirus.
* Another alien-invasion movie example: ''Film/TheFaculty''; the humans who have not (yet) been taken over by alien parasites regard each other with suspicion and must figure out who in their number has fallen under alien control...but more than that, they must determine which person has actually been an alien all along. Not really surprisingly, the one who is an alien rather than an alien-controlled human is [[spoiler:the "new girl", who has been giving the other students a BackStory they've had to take on faith, rather than having a known history in their community]].
* ''Film/{{Identity}}'' is a variation of this. 10 strangers meet in a remote hotel, where they start getting killed one by one by a killer, who is presumably one of them. At first the trope seems to be played straight, as the helpful authority figure cop is revealed to really be a criminal and a killer. However, at the end, it's revealed that ''the'' killer who was actually killing the guests was [[spoiler:the little boy. This makes sense because the characters are all personalities inside the mind of a serial killer with multiple personality disorder; the little boy is the murderous personality, representing the abuse the killer experienced as a child]].
* ''Film/DTox'' was a film with this premise, starring Sylvester Stallone. Stallone was one of 9 cops being treated for psychological problems at a remote ranch in snowy Wyoming. However, one of the other patients was actually a serial killer who targets cops, having killed the real patient and assumed his identity. The real killer turned out to be the character who was most apparently helpful and mature (as opposed to the cowardly guy or the violent alcoholic).
* ''Film/{{Mindhunters}}'' was another film with this premise, about several FBI students being trained as criminal profilers at a remote training facility. One of them is actually a serial killer killing the other characters off one by one. The killer turns out to be [[spoiler: the heroic, helpful, supportive Alpha Male of the group]].
* ''Film/ReservoirDogs'', in which one of the robbers may (or may not) be setting the others up.
* ''Film/TheUsualSuspects'', which has basically the same premise, although it's told in flashback by the one survivor who's afraid that the killer might come after him too.
* ''Film/WhereEaglesDare'' has [[spoiler:not one, but three of these. Four if you count the Colonel]].
* ''Film/FantasticVoyage'' establishes that at least one of the crew of [[CoolBoat the Proteus]] may be a Soviet agent sent to finish the assassination attempt on the scientist the mission is meant to cure. Violating the first rule of mole detection above, [[TheUntwist the character played by a sweaty, nervous Donald Pleasence who tries to open the hatch of a submerged submarine as soon as they're shrunk is the traitor]] ([[AlternateCharacterInterpretation Or just a claustrophobic man in a cramped sub who went off the deep end trying to get out--the movie never says for sure]].)
* Before the Liam Neeson flick of the same title, a film called ''Film/{{Unknown|2006}}'' combined this with EasyAmnesia and ParanoiaFuel. Several men, some of them kidnappers and others, their kidnappees, wake up with no memories and find themselves locked in a warehouse, having all been overcome by an accidentally-released toxic gas. A brief phone call from the kidnappers' accomplices reveals that more thugs will arrive soon, and presumably kill the ones who aren't on their side, but none of the trapped men know if they're the culprits or the victims...
* A very straight example in the first ''Film/EkoEkoAzarak'' Japanese film, where students are magically trapped inside a school and being killed off one by one.
* Played straight in ''[[Film/EdgarWallaceFilms Das indische Tuch]]'' (1963), released in English as "The Frightened Lady".
* ''Film/SawII'' has a group of apparent strangers finding themselves locked in an abandoned house, which is obviously full of Jigsaw's traps. They soon begin to learn that something links them all together...
* In ''Film/SistersOfDeath'', there are two moles: The one responsible for Liz Clyburn's death seven years earlier and a witness who knew the gun had real bullets in it, but stayed silent. The latter turns out to by [[spoiler:Sylvia]]. The former, [[spoiler:Judy]] claimed that Liz switched the rounds herself to commit suicide. [[spoiler: [[ShockingSwerve Judy lied.]]]]
* ''Film/{{Triangle}}'' appears to be one of these, but its "six victims on a haunted cruise ship" beginning gets subverted.
* In ''Film/BreakheartPass'', someone starts killing off the passengers and crew of a train carrying desperately needed medical supplies to an isolated fort. [[spoiler:There is more than one killer. A gang of conspirators is taking out anyone who gets close to finding out what the train is really carrying.]]

* The TropeCodifier: Agatha Christie's ''Literature/AndThenThereWereNone'', a.k.a. ''10 Little Indians''. TheMole is [[spoiler: Justice Wargrave.]]
* ''Literature/{{Another}}'' plays with this trope: every year, a cursed 9th Grade class claims the lives of students and family members due to the presence of DeadAllAlong anomaly, who's disguised as a normal member of the school and must be killed to end the tragedy. But no one's aware who that is, [[GhostAmnesia not even the entity itself]], as its very existence [[FakeMemories rewrote memories and setting]] to better blend it. ParanoiaFuel and [[WellIntentionedExtremist well-meaning students and staff]] don't mix well, to say the least.
* The Creator/StrugatskyBrothers' ''Hotel of the dead alpinist'' seems to start this way...and then things get weird.
* The novel ''The Man Who Tried To Get Away'' by Stephen Donaldson is one big heavily-lampshaded exercise in the trope. Private eye Brew Axbrewder is running short on cash and needs to lie low after treading on the toes of a local crime boss, so he reluctantly agrees to be a consultant and participant for a murder mystery vacation in a lodge out in the woods. He (predictably) hates every minute of the contrived ''Literature/AndThenThereWereNone'' event, right up until one of the participants gets killed for real. And someone has cut the phone lines. And a blizzard has blocked the only road back to town. Axbrewder and his partner assume that the crime boss has found out where he is and sent someone to take out Axbrewder and kill all the witnesses, but [[spoiler:he's only half right. The crime boss does have a hitman at the event (the maintenance man, who gets sent out to try and walk back to town, turns out to be working for him), but neither our hero or the detective know that two of the guests are actually violent psychopaths who booked into this vacation for kicks, and it's they rather than the hitman who kill most of the other guests]].
* Parodied in Creator/AnthonyHorowitz's novella ''[[Literature/DiamondBrothers I Know What You Did Last Wednesday]]''. The twist is that [[spoiler: the killer isn't actually ''on'' the island. He set everything up before hand and is controlling it remotely.]]
* Played with in the teen horror novel ''Class Trip'' by Bebe Faas Rice. The TenLittleMurderVictims plot is related in first person by one of the characters. Eventually there's just two of them left, and the police are on the way. The narrator then [[TomatoSurprise reveals that ''she'' was the killer all along]]. However, before she can kill the last remaining character, he reveals that he tape recorded her EngineeredPublicConfession even though he didn't intend to. She starts crying as the rescuers arrive as she realizes she is caught.
* The book and movie version of ''Film/TheRuins'' has this trope as a central plot point. In the book, [[spoiler:all of the characters are killed by a '''''man eating, parastic vine''''']].
* Several of Creator/SimonRGreen's ''Hawk And Fisher'' stories use this trope. His Literature/SecretHistories novel ''The Spy Who Haunted Me'' has a variant that plays out among spies held together in a group by the terms of their mission, rather than by geographic isolation.
* A variation happens in ''[[Literature/ErastFandorin Murder on the Leviathan]]'', which was intended as a tribute to Creator/AgathaChristie; what makes it unusual is that this situation came about when a detective looking for a murderer on a luxury liner had his chief suspects assigned rooms in the same salon. And then one of them was killed.
* ''Ten Little Wizards'', a Literature/LordDarcy novel, is an homage to Christie's version. A subversion, in that [[spoiler: the killer's countdown doesn't make it to "none", and the apparent killing spree is an EvilPlan by Polish spies]].
%% * ''Old Tin Sorrows''
* ''Ripper'' is Michael Slade's take on this trope, with the added twist that the guests are all mystery writers [[spoiler: and there are two killers working together, not just one]].
** Also, because TheMole kills with pre-rigged death traps, even figuring out who it is won't guarantee safety: the traps will still be lethal.
* In the ''Franchise/StarTrek'' novel ''Kobiyashi Maru'' this was a training scenario for Starfleet cadets. Several dozen cadets were dropped on an abandoned moonbase, and told that one of them was TheMole. Their teachers then sat back and watched what the cadets did. Typical behavior was to band together into small groups, and end up fighting against other groups because one of them could be TheMole. Chekhov's solution was to simply kill EVERYONE (at the end of the training, all his victims assumed he was the Mole. He thought he was the winner. The teachers explained he was simply a very skilled assassin (and a bit of an idiot)). Turns out there was no Mole, the scenario was designed to emphasize the dangers of distrust and paranoia. He was then told that his hero, a young captain named Kirk, had come up with a working solution; he invited all groups to join his, but the condition for joining was that everyone would be disarmed. The exception were two guards selected by Kirk; if one of them happened to be TheMole, the other could just shoot the guy.
* In Maurice Leblanc's first published Literature/ArseneLupin short story, ''L'arrestation d'Arsène Lupin'', the passengers of a transatlantic liner learn by telegram that the famed GentlemanThief is travelling in first class under an assumed name. All they know is he is blond and his fake name begins with R. The story deals with the idle young nobility on board trying to unmask him from those clues while various precious objects are stolen around them ; until the ship arrives and Lupin is revealed as [[spoiler: [[TomatoSurprise the narrator]], who was not blond and whose name did not begin with R, but who planted false clues to mislead the police]].
* Used to some extent in ''Literature/{{Dune}}'', with a letter throwing transparently false suspicion on Jessica. No one in House Atreides suspects Yueh of being TheMole at all, though he's already been identified as such in the narrative (it's presented as a mind-blowing revelation in-universe due to his loyalty conditioning).
* A major plot thread in the second ''Literature/{{Mistborn}}'' book-it appears for much of the book that one of the main characters has been replaced by a kandra, a creature that can consume a corpse then animate it and imitate the person in question almost perfectly. Despite assistance from her own kandra, it takes Vin most of the book to figure out who it was. As was stated on the main Mistborn page, TheReveal is quite brilliant.
* Subverted in ''Literature/TheDresdenFiles'' book ''Dead Beat'', where Harry quickly and [[InTheBack decisively]] identifies the current body of [[BodySurf the Corpsetaker]] within seconds of his/her/its body-hopping.
* Something like this plays out in ''[[Literature/KittyNorville Kitty's House of Horrors]]''. [[spoiler: It's all a subversion.]] The panicky, incompetent, suspiciously underinformed person [[spoiler: isn't the mole, but survives anyway]]. The competent but high-strung person who constantly accuses someone else of being the mole [[spoiler: isn't the mole, and also survives]]. The helpful, amiable person with lots of useful abilities [[spoiler: isn't the mole either. No one is. However, almost everyone besides those three and the narrator dies. Everyone in the house was an intended victim]].
* Subverted in Creator/JoWalton's AlternateHistory novel ''[[Literature/SmallChange Farthing]]'', which is set up as a classic [[GenteelInterbellumSetting country house]] murder mystery, then is revealed to actually be [[spoiler:[[EverybodyDidIt a political conspiracy]]]].
* In L. Jagi Lamplighter's ''[[Literature/ProsperosDaughter Prospero Regained]]'', the Prosperos have been told they have an in-family traitor. One of the things they try to unearth while descending through Hell to rescue their father.
* A variation happens in ''Literature/ADanceWithDragons'', the fifth installment of ''Literature/ASongOfIceAndFire''. [[spoiler:Roose Bolton and his allies, who are camped out in Winterfell, waiting for an enemy army to march to them]], start suffering a string of murders in their ranks. Considering many in their own number hate each other's guts, there's at least one enemy agent undercover in the castle, and some of them have very good reasons to hate their liege lord, there's suspects galore.
** Oddly, while it's established mid way through book five that most of the murders were committed by [[spoiler: Maynce Raydner and his spear-wives, they deny killing one victim in paticular (Little Walder Frey), meaning that there are at least two sets of independent murderers in Winterfell.]]
* In the teen suspense novel ''Deadly Detention,'' six students are sharing a detention when one by one they start disappearing. Everyone assumes that the detention teacher is the culprit. Everyone is wrong.
* The ''danger.com'' novel ''Shiver'' has this plot, set at a snowbound ski lodge with a group of teen actors who met online.

[[folder:Live Action TV]]
* ''Series/TheAdventuresOfBriscoCountyJr'' ("Bounty Hunters Convention").
* ''Series/{{Bonanza}}'': The 13th-season episode "The Rattlesnake Brigade", where the feared Dalton gang--on their way to prison--escapes and kidnaps Jamie and three of his buddies (a beautiful blonde and two other guys), and they plan to kill each of them, one by one, until the Cartwrights pay them a huge ransom and allow them free and undeterred access to Mexico. Indeed, one of the teens is shot and killed (during a botched escape attempt), but the Cartwrights arrive in time to stop the bad guys before any of the others are killed.
* ''Series/TheFactsOfLife'' parodied the trope by having the victims killed in silly ways (Blair was killed by over-using hair spray, Natalie was strangled with a pair of fuzzy dice). In the end, it turned out to be AllJustADream (a DreamWithinADream, in fact).
* ''Series/GameOfThrones'': Jaqen H'ghar provokes this among the Lannisters at Harrenhal, and Tywin Lannister responds by torturing his own men in search of answers.
* ''Series/GetSmart'' ("Hoo Done It").
* ''Series/LandOfTheGiants'' did it twice, with the aptly named "Seven Little Indians" and later in "The Unsuspected."
* ''Series/RemingtonSteele'' had at least one of these, with Steele referencing ''Literature/AndThenThereWereNone'' and its signature plot twist: [[spoiler:the sixth person to 'die' faked his death and was actually the murderer]].
* Subversion: ''Series/HomicideLifeOnTheStreet'' once had a murder at an exclusive country club, that appeared to be one of these. After a Christiesque setup and a cutaway, the BPD detectives had the case closed by the commercial break.
* ''Series/HarpersIsland''. [[spoiler: With 29 deaths on screen and, out of the main cast, 4 survive]].
* ''Series/StargateSG1'':
** The show features such an episode, only instead of a building, they are all stuck on the Alpha Site planet and unable to leave until the murderer is found. Tensions mount between the three races present, with the leaders under a lot of pressure to keep it from turning into a shootout. Accusations are flung around and the humans are stuck in the middle. The murderer turns out to be an invisible Ashrak, but the relationship between Earth and its two allies never quite recovers.
** The episode "Proving Ground" took the theme UpToEleven. Given that the SGC's primary foes are {{Body Snatcher}}s, they select new members through complex training exercises where EveryoneIsASuspect [[TheMole Mole]]. These exercises tend to be {{Total Party Kill}}s. One particularly promising group that refuses to get their act together finds that their umpteenth test is NotAGame. [[spoiler:It was a game with one of their own being a ReverseMole whose job was to up the ante. When they knew it was all a game, they slacked off. When they thought it wasn't, they ended up distinguishing themselves under fire and becoming a quality team]].
** In another episode, they ''knew'' who TheMole was, but it had an annoying tendency to BodySurf. That meant ''no one'' could be trusted--just because you weren't TheMole two minutes ago doesn't mean you're not TheMole ''now''--and required some [[HeroicSacrifice extreme measures]] to resolve.
* ''Series/TheWildWildWest'' episodes "The Night of the Tottering Tontine" and "The Night of the Bleak Island".
* ''Series/TheAvengers'' episode "The Superlative Seven".
* A parody of the ''Literature/AndThenThereWereNone'' theme was done on ''Series/YouCantDoThatOnTelevision'', where ten of Barth's burgers were used in place of Indians. TheMole and suspect was the second victim (it seemed) done to remove himself as a suspect. (The victims weren't actually murdered; they were kidnapped and later found BoundAndGagged in the lockers.)
* The episode "And Then There Were None" from ''Series/{{CSI}}'' has the forensic team trying to locate a gang of casino robbers. The [=CSIs=] find that each gang member was killed by one of his or her partners, and end up following a trail of dead bodies to the last surviving member of the gang.
* Played with in an episode of ''Series/{{Highlander}}'', where Hugh Fitzcairn is killed and any one of his half-a-dozen or so houseguests could have done it. However, as he is immortal, he revives and spends the rest of the episode annoying [=MacLeod=], who is trying to find the murderer without giving away the fact that he's still alive.
* Parodied in ''Series/TheGoodies'' episode "Daylight Robbery on the Orient Express".
* ''Mathnet'' (from ''Series/SquareOneTV'') did an episode like this that was both a parody (the villain turned out to be a [[spoiler:court stenographer]]) and an ''homage''.
* One ''Series/BoyMeetsWorld'' episode (Called "And Then There Were [[ShoutOut Shawn]]") features this plot, with the characters stuck in detention (caused by a quarrel between the main characters) and soon being killed by a mysterious murderer within the school, ([[ShoutOut including one by the name of Kenny]]. [[spoiler: In the end, Shawn rips off the mask of the killer to reveal [[KarmicTwistEnding that it was him under the mask all along.]] Then it's revealed that [[AllJustADream it was all just a dream had by Shawn.]] ]]
* Parodied in ''Series/{{Frasier}}'' when the station is redoing an old radio drama. It was clearly supposed to be like this, but Niles (who was forced to take on multiple roles, including the murderer, at the last second) finally gets sick of Frasier's overdirecting and "kills" every other character in under a minute, before doing himself in cheerfully proclaiming that the secret of the mystery will die with him, leaving Frasier (as the detective) to desperately close the thing out.
* ''Series/MacGyver1985'': "The Invisible Killer". Just as Mac determines which of the Phoenix employees on his wilderness stress-relief retreat is an imposter, we find out that not one but ''two'' of them are really escaped convicts.
* ''Series/TheTwilightZone1959'': "The Monsters Are Due On Maple Street". A street in a small town loses all power and use of their cars. Spurred on by a young boy's claims that this is a common comic book plot, they quickly suspect each other of being aliens. As riots break out, the audience learns that, no, none of the folks on Maple Street are aliens. The whole thing was set up by alien puppetmasters outside of town to trigger the riot, who comment on how easy conquering Earth this way is. Replace "aliens" with "terrorists" and "alien puppetmasters" with "US Army researchers", and you get the version used in the 2002 remake.
* ''Series/FirstWave'' did this numerous times and in every variation. They added the further complication that the hero himself was usually ''also'' an impostor in the group, and had to spend much of the episode convincing the others to trust him.
* ''Series/WarOfTheWorlds'' also did a number of variations on this. The most straightforward instance was "The Last Supper", complete with the undercover spy who initially appears to be a shoo-in for TheMole.
* ''Series/TheMole'' implemented this concept as a Reality-based GameShow. Thought the show the contestants are faced with several challenges which, if completed successfully, earn money that goes to a global pot. However, as the name indicates, one of the contestants is a Mole hired by the producers to make sure they win as little money as possible. Contestants are eliminated via a quiz at the end of each episode that asks several bits of biographical information about the Mole: the person who gets the least amount of questions right is eliminated.
* ''Series/{{Whodunnit}}'' also did this, although played much more straight here. The contestants were all ostensibly invited to the RealityTVShowMansion by Giles, the show's host, at the killer's anonymous behest. Giles receives and passes on instructions from TheMole, who "kills" each episode's worst-performing player in some convoluted way, thus presenting a mystery for the contestants to figure out in the next airing.
* The second season of ''Series/WhoWantsToBeASuperhero'' included such a challenge. Given that there were ''two'' actors planted amidst the first season contestants (both TheMole and a scheduled FaceHeelTurn), this was a believable threat for the heroes and the audience. [[spoiler:But it turned out to be a false one; all the contestants were for real this time, and Stan just wanted to see if they'd go into witch-hunt mode.]]
* In the ''Series/StarTrekTheNextGeneration'' episode "Allegiance", Picard found himself in a similar situation to the Star Trek novel example, where he and three strangers are left in a cell with hints that one of them is working for their captors. In this case, not only was one of them the mole, but an impostor Picard was also placed on the Enterprise to run an experiment on the crew.
* In the season 6 opener of ''Series/{{NCIS}}'', we learn that [[spoiler: Agent Lee]] is TheMole, but the team thinks it is [[spoiler: Agent Langer, who Lee frames and then kills]]. Later, they figure it out and it ends in [[spoiler: RedemptionEqualsDeath]].
* On ''Series/WMACMasters'' during a Dragon Star match between Hakim "The Machine" Alston and Ho Sung "Superstar" Pak someone wearing a ghost town ninja outfit eliminated both of them and the other masters figured out early on that one of them had to be the masked ninja. They suspected the maters who had not been seen that episode like Mike "Turbo" Bernardo and Ho Young "Star Warrior" Pak as the culprit and eventually put Star Warrior (who is the [[CainAndAbel older brother]] of Superstar) on trial for it with Tiger Claw and Olympus acting as lawyers and Turbo as Judge. He was found not guilty after the glove Tracer clamed the mask ninja dropped did not fit (so they must acquit). It turns out the masked ninja was Warlock who had secretly joined the evil cult called Jukido and was trying to steal the Dragon Star
* ''Series/{{Sanctuary}}'' has a particularly difficult one to solve. They do figure out who it is, but only the main characters survive until then.
* The story of the tail section survivors on ''Series/{{Lost}}'': Nathan is the RedHerringMole. [[spoiler:Goodwin]] is TheMole. Then there's Cindy and Libby, and we ''still'' don't know what was up with either of them. Prevailing fan speculation is that Libby was TheMole, too, but for a different organization.
* ''Series/{{Haven}}'' has a nice twist on this. Some residents of Haven decide to throw Audrey a birthday party, since she's never had one. They decide to throw it on this nice old hotel out in the ocean on a small island with no cellphone reception. Well, long story short, the owner of the hotel had subtly dropped the suggestion that they should throw the party there. Turns out, the owner of the mansion is a chameleon-thing that kills people then turns into them, and he needs more people to change into. So one of the characters are no longer that character. Doesn't help that most of the people there are minor or new characters. Oh, and the ferry isn't coming back to get them until the end of the weekend, but there is a small boat that they ride away on.
** [[spoiler: Nathan's dad shoots a hole in the boat, stating that if the chameleon gets back to the mainland, he'll escape and vanish forever, living out his days killing more and more people. Oh, he's not the chameleon.]]
** [[spoiler: Since it's a birthday party, they decide to have everyone tell them what's in their gift, something chameleon wouldn't know. Here comes Nathan's turn. He says a blue sweater. Surprise: his present is actually a blue scarf. He had someone else buy the gift and comes to the conclusion that they must've thought that the scarf would've been a better gift than the sweater.]]
** [[spoiler: [[TheReveal And the chameleon is...]] Audrey. Yes, the main character is the chameleon. When the chameleon transformed into her, he took her form, but she didn't die, so she had to lock her in a chest hidden away in the mansion. Nathan had recently discovered that he could feel Audrey, when he can't feel anything else. He figured out who the chameleon was he couldn't feel "Audrey". To confirm, he kissed Audrey, still felt nothing, pushed her back, and calmly shoots her in the chest, killing the chameleon.]]
* ''Series/DoctorWho'':
** "[[Recap/DoctorWhoS9E2TheCurseOfPeladon The Curse of Peladon]]" has various delegates from alien civilisations who have come to the castle of Peladon in a storm. The Ice Warrior delegate nearly dies in an accident and the delegate from Arcturus is found dying with a vital part of his life support missing. Everyone gets increasingly paranoid and existing racial tensions flare up.
** [[Recap/DoctorWhoS14E5TheRobotsOfDeath "The Robots of Death"]]. The twist being the killer is obvious hence the [[SpoilerTitle titles]], likewise the mastermind behind reprograming them is revealed early on. The mystery is trying to figure out which of the crew, is them in disguise.
** [[Recap/DoctorWhoS27E2TheEndOfTheWorld "The End of the World"]] has a group of aliens from across the galaxy gather on a space station to witness the death of Earth, but somebody starts to kill those on board.
** [[Recap/DoctorWhoS30E7TheUnicornAndTheWasp "The Unicorn and the Wasp"]] has this setup as a given, considering that the famous historical figure of the episode is Agatha Christie herself.
* Referenced by title, and played with, in the ''Series/{{Leverage}}'' episode "The 10 Li'l Grifters Job". TheMark invites all his favorite enemies to a murder mystery dinner party. Right after announcing that someone is about to die, the lights go off, and someone actually kills him. Nathan, realizing that he would be the prime suspect, has to figure out who actually committed the murder...while simultaneously trying to convince the rest of the guests that it's actually [[AllPartOfTheShow all part of the event]].
* "Murder at Moorstones Manor" is the ''Series/RippingYarns'' take on this trope.
* ''Series/XenaWarriorPrincess'' had an episode based on this premise, aptly called "Ten Little Warlords".
* ''Series/WhodunnitUK'': In "Final Verdict", the eight surviving members of a jury who sentenced a killer to life imprisonment 20 years ago are invited to a dinner. Via tape recording, the killer reveals that he is one of the people attending the dinner in disguise, and that they have to find him before they all die.
* ''Series/MissFishersMurderMysteries'': In "Murder Under the Mistletoe", a ThemeSerialKiller starts picking off the guests and staff of a SnowedIn chalet one by one.
* ''Series/SapphireAndSteel'' parodies this in "Assignment Five". The apparent murders are actually a malevolent temporal force disposing of all the people who weren't alive at the time of events that are intended to suffer a MakeWrongWhatOnceWentRight.
* ''Series/InsideNo9'': ''[[Recap/InsideNo9S3E6PrivateView "Private View"]] is based on this premise and takes place an art gallery, where all of the characters are told they have been hand-picked for the exclusive first viewing. Two of the characters lampshade the trope by discussing how the events of the episode are similar to an Agatha Christie novel, and to Big Brother. The murderer [[spoiler: turns out to be the mother of the dead artist, and the artist did not plan or know about the murders; her motive is that she feels each of the characters, who were donated an organ by the artist, were ungrateful]]. The final twist is that [[spoiler: the last character left alive manages to kill the mother and takes credit for the art exhibition.]]

* "Who Done It?" by Music/HarryNilsson. It starts out as a straightforward version of this trope, with 13 characters in a house who start dying, but [[spoiler: eventually the narrator ends up alone and gets arrested and sentenced to death despite proclaiming his innocence. It's up to the listener to decide if this is outcome G or H, since two of the characters disappear from the song without explanation: [[TheButlerDidIt the butler and his wife]].]]
* Subverted in ''Zehn Kleine Jägermeister'', a parody of the Ten Little Indian Boys rhyme by Music/DieTotenHosen, in which the titular Jägermeister die accidentally, generally because of their [[TooDumbToLive very poor judgment]].

* The AudioPlay/BigFinishDoctorWho story "Bang Bang a-Boom", concerning acts at the [[Series/EurovisionSongContest Intergalactic Song Contest]] murdering each other.

[[folder:Role Playing Games]]
* The ''[[TabletopGame/TheWorldOfDarkness World Of Darkness]]'' series is somewhat notorious for setting up this trope ad nauseum. Any time a vampire hosts a party, you can guarantee he's going to be dead by the end of the night.
* The 1E ''TabletopGame/{{Ravenloft}}'' module's sequel, ''House on Gryphon Hill'', features Strahd von Zarovich as TheMole within the Weathermay household, and the entire population of Mordentshire as its TenLittleMurderVictims...with the added twist [[spoiler:that not all the victims are being murdered: most are being [[BodySnatcher possessed by Strahd's minions]] and turned into Moles as well]].
* Note: don't try this in a system that allows for "raise dead", as [[Blog/ThingsMrWelchIsNoLongerAllowedToDoInAnRPG Mr. Welch, DM found out once]].

* ''The Butler Did It'', another comedy parody of this genre. A woman invites her favorite mystery authors to her mansion, and one by one they begin getting murdered. Characters start throwing in red herrings simply for the sake of having red herrings, and in the end [[spoiler: the wacky maid reveals she is actually the killer-and not actually that wacky.]]
* ''Theatre/TheMousetrap'', also by Christie, did this, in which the characters were guests at a hotel trapped due to a snow storm.
* There is also a stage adaptation of ''Literature/AndThenThereWereNone'', also penned by Christie.
* ''Something's Afoot'' is a broad musical parody with the characters dying in increasingly absurd ways ranging from a [[spoiler:man-eating vase]] to a [[spoiler:pygmy hidden in a potted plant]]. As usual, there is a man and a woman left as the last survivors. [[spoiler:While celebrating their survival, they accidentally drink the poisoned wine.]]
* In the play ''But Why Bump Off Barnaby?'', Barnaby claims that one of the guests isn't who he seems, and writes part of the person's name before dying. Most characters have those three letters in their name.

[[folder:Video Games]]
* ''VideoGame/TheElderScrollsIVOblivion'' has fun with this trope. During the 'Whodunit?' quest, this sort of plot is set up where 6 people, including the PlayerCharacter, are all invited to a mansion, told it's a competition for treasure, and that they will be locked in until somebody finds it. Then people start dying. The amusing part? [[spoiler: It's a mission for the Dark Brotherhood, AKA the Assassins guild; '''''YOU''''' are the murderer, hired by the mansion's owner to help him get revenge on the other 5 "guests". You actually get a bonus if you manage to kill them all without anybody discovering that YOU are the killer.]]
** For extra giggles [[spoiler: you also have the key to the mansion.]]
* This is the premise of the amateur adventure video game ''5 Days a Stranger'' (part one in the ''VideoGame/ChzoMythos''[=/=]John De Foe Quadrology series by Ben "Yahtzee" Croshaw): 5 people from different walks of life are lured into a house, one by one, and become trapped. Pretty soon they start dying. Each and every one of the five is a suspect, including the protagonist.
** It turns out [[spoiler:the culprit is a ghost, and has been [[DemonicPossession possessing]] multiple different people--''including'' the protagonist]].
** The other games in the series can be said to follow the same trope, especially the second (7 Days a Skeptic), set on a spaceship with no means of escape.
* That is actually the name of a map extension in ''VideoGame/MakaiKingdom''
* The game ''[[http://www.bbc.co.uk/drama/shakespeare/game.shtml Seven Noble Kinsmen]]'' has seven Shakespearean actors plus the player character, a theatre critic who ruined the actors' careers, invited to an isolated mansion/theatre by a mysterious host who never shows up. Then people start dying off...
** Interesting in that [[spoiler: the murderer changes with each game play (the clues to his/her identity are also changed).]]
* This is the premise for a couple of roleplaying games using the VideoGame/{{Byond}} engine.
** ''VideoGame/MitadakeHigh''. Except in high school.
** ''Murder Mansion'', too, complete with above-mentioned heavy storm.
** ''VideoGame/SpaceStation13'' as well, set in space.
* The PointAndClick computer game ''VideoGame/TheSeventhGuest'' uses this as a base premise--with a twist. A mad toymaker lures guests into a house he built and makes them solve riddles. If they solve all of them, they'll get whatever they most desire. Unfortunately, these wishes have an ironic twist--if the guest doesn't expire in the course of the game. Thing is, he only lured six people into the house. The seventh guest? [[spoiler:A little boy who turns out to be ''you''--and you were DeadAllAlong]].
* This is the premise of the ''VideoGame/LauraBow'' PC adventure game ''The Colonel's Bequest'' and its sequel ''The Dagger of Amon Ra''. The first game takes place on an old plantation in 1920s New Orleans where the protagonist Laura Bow's friend has invited her to stay with her family, who have gathered to hear the old Colonel's will. When it's revealed that the Colonel's will is that his fortune be split equally among his loved ones who outlive him, [[{{Tontine}} people quickly start dying]], and you are forced to collect clues to try and figure out who killed who, and why. The second game takes place in a museum following a robbery, and one by one everyone inside starts getting bumped off. In both games it is up to the player to figure out just what is going on, and if you get it wrong (or in the second game, don't have the evidence to prove that you're right) you will get the bad ending and let the murderer escape, perhaps at the cost of your own life.
* Text adventure game ''Delightful Wallpaper'' by Creator/AndrewPlotkin is a version of this, with the PC (apparently invisible to the [=NPCs=]) placing various "intentions" around a mansion which drive the guests to kill each other.
* ''VideoGame/MegaManBattleNetwork 2'' has a portion spent like this. A group of Official Netbattlers, including the hero, Lan, and the [[TheRival rival]], Chaud, are gathered in a castle for a meeting. It eventually turns out that not only was there a spy in their midst, [[spoiler: the spy is the innocent-seeming Princess Pride, who faked being attacked early on. You learn this after both Lan and Chaud have already been left the only two suspects, and have fought to the DisneyDeath out of paranoia.]]
* The ''VideoGame/GarrysMod'' has couple of gamemodes with this kind of premise.
** ''VideoGame/TroubleInTerroristTown'', where there are "innocent" terrorists and "traitor" terrorists. The traitors are the murderers.
** ''VideoGame/{{Murder}}'' has one knife-wielding murderer and a bunch of innocent bystanders, who have a single gun to defend themselves against the murderer.
* In ''VideoGame/CalmTime'', the main character invites some people to a party on his house in the countryside, a place far from civilization with not even cellphone coverage. [[spoiler:It is possible that the protagonist chose this place to make it easier to trap people in there and murder them.]]
* ''VideoGame/UntilDawn'' subverts this. The first portion of the game has eight young friends gathering in a ski lodge to hang out, on invitation by one member of the group, where they soon find out that they're being stalked and menaced by a SlasherMovie-style serial killer who [[spoiler: kills at least one of them. It then turns out that the one who is murdered, who was also the one who invited the rest, actually ''is'' the killer, and ''did'' invite his friends up as targets... of a particularly intense prank; he's not a killer at all (though he's still obviously unhinged and the prank could have easily gotten someone killed had something gone wrong). While the kids do turn out to be in real danger, [[{{Wendigo}} its source]] isn't targeting them specifically; rather its taking advantage of their being there.]]
* ''VideoGame/TownOfSalem'' is based on Mafia above, and pits the town against the Mafia and one or more other evil roles out to destroy them.

[[folder:Visual Novels]]
* In ''VisualNovel/NineHoursNinePersonsNineDoors'', the characters have been kidnapped by a mysterious person called Zero to play a "Nonary Game" on a sinking ship. But some of the players know each other in a less-than-friendly context, and they aren't all able to go through the final door. You do the math...depressingly, though, it turns out [[spoiler:the game is designed so all players survive by the end if they cooperate. While they can't all go through the final door, there are two final doors that would allow everyone to get through. Also, the only people in any real danger are those who made the first Nonary Game, the one played during the game being the second. The "sinking ship" the protagonist is on is a facility in the Nevada desert]].
* A large part of ''VIsualNovel/UminekoWhenTheyCry'''s plot is based on this trope, fittingly, considering that the whole story is a WholePlotReference of the TropeNamer. Between a SuccessionCrisis and a bizarre riddle counting off the visitors' horrific deaths (most of them in [[LockedRoomMystery closed rooms]]) in a witch resurrection ceremony, the characters can't figure out whether they're being bumped off [[MaybeMagicMaybeMundane by each other or by an actual witch]]. And to add a meta-layer, you soon realize that [[MindScrew the third-person narration is often outright]] ''[[UnreliableNarrator lying]]'' (though the way it lies and what it shows often serves as a hint). Oh, and if the hero hasn't found the culprit when time runs out, [[GroundhogDayLoop the two days reset and another murder scenario starts]]. In the end, it turns out [[spoiler:that not only is the culprit among the 18 people, they want to be discovered and stopped]]. All in all, this is quite a [[ZigZaggingTrope zig-zagging]] example.
* ''VisualNovel/DanganRonpa'' has an interesting example: the presence of a mole is not revealed until the fifteen students have been whittled down to [[spoiler:seven]], and the mastermind ''immediately'' reveals the mole's identity in the hope that someone will murder him/her. [[spoiler:There was also a second mole who was betrayed by the mastermind and murdered in the first chapter]].
** ''VisualNovel/SuperDanganRonpa2'' goes a step further by having the mastermind reveal ''from the start'' that one of the sixteen students is a "traitor". [[spoiler:However, this "traitor" is not a murderer but an observer sent to ''help'' the students. Furthermore, the knowledge of this "traitor"'s presence does not drive anyone to murder out of paranoia: the victim of Chapter 5 does take lengths to flush out the traitor, but it is decidedly not "murder out of paranoia". In fact, his goal is actually to ''kill everyone but the traitor''.]]

* In ''Webcomic/{{Jack|DavidHopkins}}'', the titular grim reaper takes the souls of 5 people killed in an explosion, and leaves it to them to find out who planted the bomb. Given the way the story was resolved it seemed likely that Jack was doing it in order to give some of them (particularly an individual in the group who had already suffered loss as Jack took someone he loved in a previous arc) a chance at last minute redemption and closure that if he just took them as is more would have gone to hell than actually did. Character development by that point had him doing what he could to help souls escape damnation and since he had already had 'monitors' following him around decided to put them to a positive use with their ability to create temporary zones like was done in that story.

* Used in ''WebVideo/KateModern'' during the "Trouble in Paris" arc, in which the situation is complicated by several characters having their own secrets, and by the fact that, with one exception [[spoiler:who ISN'T the mole]], the characters are all friends and protagonists.
* Back when ''Neopets'' was intended for college students, there was the "Ski Lodge Murder Mystery", which consisted of (avatars of) staff members being stranded in a Ski Lodge in a snowstorm.
* The plot of ''WebVideo/TenLittleRoosters'', where ten members of Creator/RoosterTeeth are locked in their studios for the night with one of them being the killer. Interestingly, a lot of the plot points used in connection with this trope are defied. The idiots [[spoiler:(Gavin and Chris)]] are killed off early, TheHero doesn't exist [[spoiler:(Miles ''attempts'' to be TheHero, but it doesn't pan out)]] and everyone would rather just go and hide somewhere and wait for the cleaning lady to come and unlock the door in the morning so they can all leave.
* ''WebVideo/EdgarAllanPoesMurderMysteryDinnerParty'' has this as its primary plot. Edgar Allan Poe invites fellow famous writers to his home, offering them with a fake murder mystery that soon turns all to real. The guests even include Agatha Christie, who runs suspiciously late and misses the first murder.
* Web Reality show ''WebVideo/EscapeTheNight'' had this in it's premise, especially in its first season. Surprisingly, its a surreal version of F and K, as although the first episode tell's the contestant's that it's the house/AncientEvil Responsible, [[spoiler: In episode 2, they find a note stating "One among you Is in league with the evil". Who is it amoung the main cast? None of them, but Arthur, Head of Staff and NPC Character. This leads to alot of the early elimination's being out of paranoia, due to the VotedOffTheIsland mechanic, such as Justine's and Glozell.]]

[[folder:Western Animation]]
* ''WesternAnimation/SpiderManAndHisAmazingFriends'': In "Seven Little Superheroes," [[MasterOfDisguise the Chameleon]] invites Spider-Man, Iceman, Firestar, Captain America, Doctor Strange, Namor the Sub-Mariner, and Shanna the She-Devil to an island where they are trapped by a forcefield and targeted one at a time. The episode's name even reflects the alternate name of the novel. [[spoiler: Too bad Aunt May's puppy sneaks in and then becomes a SpannerInTheWorks, since she acts as an EvilDetectingDog...]]
* WesternAnimation/LooneyTunes and WesternAnimation/MerrieMelodies:
** "The Case of the Stuttering Pig", starring Porky Pig. On a dark and stormy night in a large, spooky mansion, Porky's rich uncle has announced his will through his attorney, Goodwill, that he, Petuna, and his four brothers (Patrick, Percy, Portis, Peter) will inherit the fortune...but if they're all dead when the uncle dies, Goodwill gets the money. After Porky, Petunia, and his siblings leave, Goodwill reveals to the audience his true self as a money-hungry fiend who intends to kill all six pigs and inherit the money; he drinks Hyde formula and transforms himself into a monster. Later on, Goodwill kidnaps Porky's brothers one by one and then Petunia as they're walking through the mansion. Eventually, Porky finds Petunia and his siblings tied up in stocks in Goodwill's laboratory, and the main protagonist frees them...only for the fiend to break in and eventually corner everyone and kill them. Before that happens, a chair suddenly is thrown out of nowhere and knocks Goodwill silly, allowing the pig sextet to get the upper hand and subdue the monster in the stocks where Goodwill had restrained them earlier. Just before the iris-out--and presumably just before the police arrive to take Goodwill into custody for fraud and conspiracy to commit murder--the pigs wonder where the sudden assist came from. An off-camera voice shouts out "ME!" When the shocked monster asks for an explanation, the voice replies, "I'm the guy in the third row, ya big sourpuss!!!" The ultimate hero, it turns out, was one that Goodwill (shortly after turning into his monster alter-ego and revealing his diabolical plan) had specifically tried to intimidate earlier.
* A ''{{WesternAnimation/Futurama}}'' episode, "Anthology of Interest I" features a story entitled "Dial L For Leela" that features this.
* The ''ScoobyDoo'' episode "A Night of Fright is No Delight" (the one with the [[spoiler:[[RidiculousExchangeRates Confederate money]]]].)
* Two, count them, TWO ''WesternAnimation/AdventureTime'' episodes featured this trope: "Mystery Train" and "The Creeps". [[spoiler:Both of them were practical jokes that all the apparently "killed" people were in on]].
* An episode of ''WesternAnimation/PoliceAcademyTheAnimatedSeries'' featured "Agatha Crusty" and "Ten Little Coppers".
* ''WesternAnimation/HulkHogansRockNWrestling'' featued an episode called "Ten Little Wrestlers".
* ''WesternAnimation/TransformersAnimated'' has this in the FlashBack filled episode "Autoboot Camp". [[spoiler: Wasp was framed, and the ''real'' mole went on to become the head of Autobot intelligence while Wasp slowly went insane. [[NiceJobBreakingItHero Way to go, Bumblebee]].]]
* ''WesternAnimation/FamilyGuy'' took on this one in "And Then There Were Fewer". [[spoiler:It was [[TabletopGame/{{Clue}} Diane Simmons in the dining room, the living room, the upstairs hallway, and an upstairs balcony]] with, respectively, the gun, the knife, and the Golden Globe]].
* WesternAnimation/YoungJustice has a rather unique take on this. Once the core Six of Season One's cast is established, one of the villains hints to the team lead (Aqualad) that there is a mole on the team. It's quickly narrowed down to the three newest members (Superboy, Miss Martian, and Artemis) and the audience has suspicions for all three and each are given episodes that further hint to their culpability (Superboy was programed by Cadmus which was tied to the supervillain group The Light from the get go and was later given an improvement by Luthor, Miss Martian had some moments where she shied away from being open with something about her life on mars with the team, and its later revealed that she is a white Martian and The Light has known this for some time, and Artemis is claimed to be Green Arrow's niece but doesn't live remotely near him to be a sidekick and was seen as Speedy/Red Arrow's replacement, and later revealed to be the daughter to the Light's chief enforcer and the handler for the mole). Subverted when [[spoiler: they all three realize that the light is calling them to to set up an ambush and reveal to the team that they had been compromised, allowing the team to set up the Light members]]. DoubleSubverted when [[spoiler: The real mole turned out to be Red Arrow/Speedy, who was a Cadmus clone and programed to be a ManchurianCandidate who was trying to get into the Justice League, not the team and was giving away the team info that his pals on the team had been telling him with the hope of trying to convince him to join.]]

[[folder:Real Life]]
* These are sometimes acted out in real life as a form of life-action entertainment / improv. People show up to a set and are given character names and act out in real time a murder mystery where one of them is the killer. Sometimes even the "killer" ''him/herself'' doesn't know the character they're playing is the killer. Needless to say they're a ton of fun.