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14[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/detective_reveal.png]]
15[[caption-width-right:300:"And that's how I know that it was you who stole my favorite teddy bear!"]]
16[[caption-width-right:300:[-[[http://brentotey.wordpress.com/2011/11/12/day-9/ Image]] courtesy of [[http://brentotey.com/ Brent Otey.]]\
17Used with permission.-] ]]
18
19->''"I've called you all here to the parlor to watch as I gradually solve the crime. One of the people in this room... IS A BIG MURDERER!"''
20-->-- '''Dr. Zoidberg''', ''WesternAnimation/{{Futurama}}'', "[[Recap/FuturamaS2E16AnthologyOfInterestI Anthology of Interest I]]"
21
22A Subtrope of TheSummation, this commonly occurs at the end of a murder mystery or investigation into a heist or burglary. The GreatDetective, who has brilliant powers of observation and deduction, gathers all suspects together in a room, so that the detective can tell them who the murderer is. The detective goes down the list of suspects one by one, explaining why they are innocent — although some of them may be guilty of other crimes, such as disposal of evidence. Eventually he will get to the guilty party, and explain how--and why--the murder (or theft of a precious object) was committed.
23
24Expect at least one embarrassing secret about a character's DarkAndTroubledPast or current scandalous behavior to be unearthed during this scene.
25
26Common [[StockPhrase stock phrases]] in these scenes:
27* "I suppose you're all wondering why I've gathered you here..."
28* "Someone in this room... is a murderer!" May be followed by a ScareChord.
29* ''[[{{Jaccuse}} J'accuse!]]''
30
31FridgeLogic kicks in when you realize that, if the detective ''already knows'' who the killer is, they should just have that individual arrested. And it's probably best to do that by ''surprise'', rather than by giving a long speech in which the list of suspects is gradually shortened, and the killer might be tempted to run away before anyone can handcuff them, or worse, hurt someone while resisting.
32
33Additionally, any testimony or statement given by those present at the summation might be inadmissible in court, as they have been led to believe speculation presented as fact. But this is an AcceptableBreakFromReality, and the trope still works well from a storytelling perspective, since it both builds suspense and explains all the loose ends, tying up the story.
34
35----
36!!Examples:
37[[foldercontrol]]
38
39[[folder:Anime & Manga]]
40* Subverted in an arc of ''Manga/BlackButler'', where three murders occur over the case of a single night: the unexpected arrival of Vicar Jeremy, who has an alibi for all three, explains to the guests who was responsible. [[spoiler:After doing so, however, one particular guest, [[BeenThereShapedHistory an aspiring novelist]] named [[Creator/ArthurConanDoyle Arthur]], realizes that the murderer convicted had been framed as part of a plan on the behalf of Her Majesty the Queen, and returns for a private discussion on that front.]]
41* ''Manga/CaseClosed''. Played with a lot since Conan, as a child, has to use Kogorou as a sort of mask in order to reveal the truth, by knocking him out, slumping him over something for a generic "deep thought" pose, and using a voice-changer to talk like him. Not always the best idea, since, sometimes, these suspects aren't very willing to just stand and watch the man reveal everything.
42** While it's clear he developed the habit out of a need for recognition and adulation, he does learn to try to lead the police - or Kogorou - instead and resort to summation by proxy when that simply isn't working... which just happens to be "almost always". (Although whenever there's a way he can do it as himself and get the credit he falls right back into this.)
43* Anime/CaseFileNoTwoTwoOneKabukicho: Sherlock usually delivers his summation in the form of rakugo, complete with a stage and costume.
44* ''Manga/TheKindaichiCaseFiles'' ends every story arc with one of these, although they rarely happen in a parlor, instead usually occurring in the same place where one of the victims was killed. The summation is usually accompanied by a dramatic explanation of exactly how the killer carried out his crimes. Kindaichi will explain everything -- motive, method, all the secrets behind the case -- without revealing the killer's identity, leaving that for the very end.
45* For a series featuring Sherlock Holmes, ''Manga/MoriartyThePatriot'' is surprisingly light on gatherings to explain mysteries, but there is one at the end of ''The Two Detectives'' when Sherlock and William come together to identify the murderer.
46* The ''Music/{{Tsukiuta}}'' anime's mystery parody episode, over the murder of Haru's glasses, had to include one of these - or two, as it turns out, since Koi bungles the first one by accusing the managers. The managers have been away from the cabin all day, and didn't even know there was a "case". And there's a second one, when all the characters go looking for Hajime, who has the answer... [[spoiler: it was the pet rabbit]].
47[[/folder]]
48
49[[folder:Audio Plays]]
50* The Doctor arranges one in the ''AudioPlay/BigFinishDoctorWho'' play ''[[Recap/BigFinishDoctorWho039BangBangABoom Bang-Bang-a-Boom]]'', in which he proceeds to reveal the secret motives of nearly every speaking character who isn't dead in the best tradition of Hercule Poirot, before finally revealing the actual murderer. [[spoiler: Except Nicky Newman, who doesn't have any secrets. The Doctor just thinks being scared by a baseless accusation might do the boy some good.]]
51-->'''The Doctor:''' Well, now. I suppose you're all wondering why I called you all here.\
52'''Mel:''' To unmask the murderer, surely.\
53'''The Doctor:''' Well ... yes. Yes, right then. Well, I've pressure-locked the doors and there are guards posted outside, so nobody can leave this drawing room.\
54'''Mel:''' Ready room.
55* Parodied in ''Creator/{{Cheech and Chong}}'s'' comedy sketch "Pedro and Man at the Drive-In". Pedro is settling in to watch a Film/CharlieChan movie. From the car speaker, he hears the end of the movie:
56--> '''Chan:''' Everybody in this room have motive for killing Mr. Taylor. But Mr. Taylor only have one killer. And the name of that killer is...\
57''(Static)''\
58'''Drive-in employee:''' Ladies and Gentlemen, snack bar will remain open another fifteen minutes. After that it's closed for the evening. Thank you.\
59''(Static, fanfare plays)'' [[note]]VanityPlate fans may recognize the fanfare as being one of the several used by [[Creator/TwentiethCenturyFox 20th Century Fox Television]] from the 1960's to the 1980's.[[/note]]\
60'''Announcer:''' And now, a preview of our coming attractions!
61[[/folder]]
62
63[[folder:Comic Books]]
64* In ''ComicBook/{{Fables}}'', this takes place around a rooftop pool, but Bigby Wolf calls it [[InvokedTrope specifically because]] it's [[IAlwaysWantedToSayThat something he's always wanted to do]] as a Cop/Detective.
65* Done by Inspector [=LeBrock=] at the end of several volumes of ''Comicbook/{{Grandville}}''. In the final volume, which had the final scene ''sealed'', crime writer [[CreatorCameo Bryon Turbot]] helpfully explains that this is called the "unravelling". (Everyone in ''Grandville'' is speaking [[TranslationConvention French translated into English for the reader]], and this includes words that were borrowed by English in our timeline, like "denouement".)
66* Despite having an entire space station the size of a city to work from, Detective Werner of ''ComicBook/JannahStation'' always insists on gathering the suspects, witnesses, and other persons of interest into an actual parlor.
67* ''ComicBook/JonSableFreelance'': Jon does this at the end of "The Hard Way" (the only traditional murder mystery in the series) in #45; gathering all the suspects into the lounge of the yacht where the murder occurred, and exposing the murderer and explaining how the LockedRoomMystery was committed. Jon has a weakness for indulging in classic genre 'bits'.
68* Most issues of ''ComicBook/TheMazeAgency'' feature one.
69* ''ComicBook/{{Ruse}}'':
70** The first issue opens with a summation gathering; the great detective is finding the whole thing so tedious that he skips TheSummation entirely and goes straight to pointing and saying "Him."
71** There's a proper summation gathering in a later storyline, following the murder of Lionel Oxford-Collins.
72* In ''Comicbook/TrialOfTheAmazons: Comicbook/WonderGirl'' #2, Cassie addresses the queens of the three Amazon tribes and their bodyguards.
73-->'''Cassie''': ''Well, buckle up!'' Because I'm going to not only reveal who [[spoiler: Hippolyta]]'s murderer is, but I will take you step by step to absolve those who I suspected of killing her. So as to remove any doubt that only one of you could have done it!\
74'''Nubia''': Go on.\
75'''Potira''': ''[sotto voce]'' What's happening?\
76'''Faruka''': ''[sotto voce]'' I think she is playacting as detective now.\
77'''Potira''': ''[sotto voce]'' Oh, gods!
78[[/folder]]
79
80[[folder:Comic Strips]]
81* Parodied in one ''ComicStrip/TheFarSide'' comic, with the detective announcing to the gathered suspects that [[TheButlerDidIt the butler]] gored and trampled the murder victim to death. Just ignore the [[ElephantInTheRoom elephant in the trenchcoat]]...
82[[/folder]]
83
84[[folder:Film — Live-Action]]
85* ''Film/EightWomen'' has a variation in that it's the ''culprit'' who does the summation. [[spoiler:Catherine is the culprit, but not the murderer because Marcel, the "victim", was never dead; she helped him fake it. The summation consists of her unveiling the whole plot she and Marcel concocted to get the other women to reveal their secrets, and accusing them of bringing Marcel nothing but misery.]]
86%%* Happens frequently in the ''Film/CharlieChan'' movies.
87* Inspector Elliot gathers all of the circus folk in the centre ring for TheSummation at the climax of ''Film/CircusOfFear''.
88* Like in the ''Thin Man'' movies, ''Film/TheExMrsBradford'' has Brad (played by Creator/WilliamPowell, no less) gather all the suspects in a room to show his ShowWithinAShow evidence of the true murderer.
89* Happens in each of the Creator/AlbertFinney and Creator/PeterUstinov ''Literature/HerculePoirot'' movies. This includes ''Literature/DeathOnTheNile'', even though the book just had Poirot explain his conclusion to the killers and a couple of others, not the whole boat. Lampshaded in [[Film/DeathOnTheNile2022 the 2022 movie]] where Creator/KennethBranagh's Poirot admits this trope is just so he can show off to everyone how clever he is. [[LetsGetDangerous By this stage however he's not playing games]]; he has the crew lock everyone in the room and stands guard over the only exit with a .45 automatic in his hand.
90* Creator/DanielCraig's Benoit Blanc gives an impromptu one in ''Film/KnivesOut''.
91* Parodied in Neil Simon's ''Film/MurderByDeath''. Lionel Twain calls together the world's five greatest detectives and issues them a challenge: to solve a murder that hasn't yet occurred. At the end of the movie, they go through this trope five separate times, as each detective claims to have solved the murder and tries to prove that they're right. The various explanations completely contradict each other, and all of them turn out to be wrong anyway.
92* ''Franchise/ThePinkPanther''
93** Subverted in the second film of the series, ''Film/AShotInTheDark''. Clouseau has no idea who the killer is, so gathers all the suspects and arranges for his partner to turn out the lights, hoping the guilty party will panic and flee. The meeting instead dissolves into an enraged argument between all the suspects in which they all reveal each other to have committed one of the murders (the sole "innocent" suspect is revealed to be a blackmailer, as well) [[TormentByAnnoyance out of sheer annoyance at Clouseau's bumbling]], with Clouseau [[AsideGlance staring helplessly into the camera]] before the lights go out.
94** ''Film/ThePinkPantherStrikesAgain'' had [[https://www.youtube.com/watch?v=gF2WO-JZ0WY a humorous scene]] where Clouseau ''accidentally'' lands in the sitting room of a house he was investigating following [[ItMakesSenseInContext a disastrous attempt to show off his gymnastics skills]] and promptly tries to improvise a summation with everyone present. Hilarity ensues as he completely bungles up all the facts.
95---> '''Clouseau''': Now, what do we know? One, that that Professor Fassbender and his daughter have been kidnapped. [[CaptainObvious Two, that someone has kidnapped them]]. [[ArsonMurderAndJaywalking Three, that my hand is on fire]].
96* In ''Film/TheThinMan'' and ''The Thin Man Returns,'' Nick Charles solves the mystery by this method. In the first movie, by his own admission, he hadn't quite sussed who the murderer was; he'd ruled out most of them, so he laid out the facts until one of the remaining suspects fit, and made an accusation.
97** [[LampshadeHanging Lampshaded]] in one movie by Nora - "First you have the Gathering, followed by the Summation, followed by the Payoff!" (in bullets)
98[[/folder]]
99
100[[folder:Literature]]
101!!Authors:
102* Creator/AgathaChristie novels are known for this: Literature/HerculePoirot almost always does it (although he usually explains to the cops what's happened before the actual summation); so does Literature/MissMarple. However, Literature/TommyAndTuppence Beresford rarely do and [[Literature/ParkerPyneInvestigates Parker Pyne]] almost never does; Tommy and Tuppence's investigations tend to be usually messier and more convoluted, and Parker Pyne, when his job of "making people happy" involves investigating a crime, prefers to be subtle about it. Christie's Summation Gatherings frequently also mark the beginning of a romance, and sometimes the end of one.
103** In ''Literature/TheMurderOfRogerAckroyd'' Christie plays with this. Poirot gathers together all the principals and walks them through his investigation in standard Summation Gathering style, explaining the various plot twists and {{Red Herring}}s. Then he sends them home, ''without'' revealing who the killer is--except for the killer, whom Poirot holds back for a private chat in which he drops the bomb.
104** Ironically, Christie did this in her first novel, ''Literature/TheMysteriousAffairAtStyles'', only due to [[invoked]]ExecutiveMeddling. In her first draft, Hercule Poirot explains the solution and identifies the killer in open court, after he's called as a witness in a murder trial. After her publisher objected to this as being nonsense, Christie came up with a new ending where Poirot summed up everything and exposed the murder in a gathering with most of the characters--and in the process may have invented a trope.
105** ''Literature/LordEdgwareDies'' has a BaitAndSwitch version where Poirot only invites a couple of characters. He immediately starts accusing one of them of being the murderer, which they deny until they're almost to the point of tears and start to confess to other lies they made... and Poirot agrees. He then reveals that the murderer is someone who was not invited, and he only arranged the gathering because he realised that the suspect had disrupted the investigation by feeding him lies and [[PerpSweating wanted to punish them]].
106
107!!Individual works:
108* Lawrence Block's ''Literature/BernieRhodenbarr'' does this in every book, [[LampshadeHanging lampshading]] every time.
109* From the ''Literature/ErastFandorin'' novel series:
110** An accidental one in ''Literature/TheTurkishGambit''. The bad guy, a spy for Turkey, has lured the principals into the Constantinople suburb of San Stefano. He has almost gotten them to go into Constantinople itself, which unbeknownst to the others is a trap, when Fandorin shows up JustInTime to stop them. He then identifies the bad guy and explains his intricate espionage plot.
111* Used in the ''Literature/ForgottenRealms'' novel ''Murder in Cormyr'', when retired wizard Benelaius uses this setup, which his servant Jasper notes as coming from a series of detective novels Benelaius claims to despise, to expose a man guilty of espionage, attempted mass murder, and (of course) murder. Subverted in that Benelaius arranged for the murderer to sit somewhere where he could make an easy escape and flee into exile rather than face death as Benelaius was a pacifist. Also subverted in that [[spoiler: while the first two accusations were true Benelaius knowingly framed the accused for the actual murders so as to cover up the real murderer's guilt.]]
112* A non-murder-oriented mystery is "solved" in this fashion at the end of the first trilogy of the ''Literature/FoundationSeries''. Each Foundation scientist takes turns arguing for their theory as to Second Foundation's identity, until after all other theories have been discounted, the final speaker identifies [[spoiler:a Second Foundation mole in the very room.]]
113* In Creator/GlenCook's Nero Wolfe-inspired ''Literature/GarrettPI'' series, this happens at Garrett's house in ''Cold Copper Tears'', and at the brewery in ''Faded Steel Heat''. In a variant, the gatherings aren't just an opportunity for the sleuth to explain his deductions, but also for the Dead Man to use his mind-reading powers on the culprits and any accomplices.
114* ''Literature/JohannesCabalTheDetective'': {{Invoked|Trope}} by Johannes to explain not only a double murder but also the circumstances that led him to be there -- no small feat, since he distracts one audience member from trying to shoot him dead on the spot. {{Justified|Trope}} because [[spoiler:he's stalling for time for a bomb to go off]].
115* In Creator/RandallGarrett's ''Literature/LordDarcy'' homage to "Too Many Cooks", ''Too Many Magicians'', the Summation Gathering takes place in the Nero Wolfe-analogue's office, but it's conducted by Lord Darcy. However, the SummationGathering is actually [[KansasCityShuffle an elaborate misdirection]] to [[spoiler:get the real murderer to give them his sword to reenact the murder, so he'll be unarmed when they arrest him]].
116* In Creator/VernorVinge's ''Literature/MaroonedInRealtime'', the detective Wil Brierson calls most of the (decimated) world's population into a meeting hall to accuse the suspect of murder. The character is not only aware of the trope whilst doing it but is worried about a horrible variant he read about: detective gathers the suspects into a room then applies a definitive test to all the suspects: all suspects are guilty. Unmarked grave for detective, happy end for the suspects.
117* ''Literature/TheNakedSun'': Personal contact is a taboo on Solaris, so Detective Baley has to gather the suspects via a holographic conference call and send his robot assistant to arrest the murderer. Baley uses the trope to force a confession [[spoiler:from Leebig and thereby [[FramingTheGuiltyParty frame him for the murder]], having realized that Leebig had [[SympatheticMurderer manipulated the real killer]] and was plotting far worse crimes.]]
118* ''Literature/NeroWolfe'' virtually always does something like this. It's not in the parlor, though, it's almost always in his office instead. In the few stories where he's had to leave his house, and resolve the case before he can return to it, the Summation Gathering takes place in whatever place is appropriate:
119** In ''Literature/TooManyCooks'', it is held at the banquet table at the Kanawha Spa, following the final feast of Les Quinze Maîtres.
120** In ''Literature/SomeBuriedCaesar'', it takes place at Thomas Pratt's home in upstate New York.
121** In "Immune To Murder", it takes place at O. V. Bragan's fishing lodge in the Adirondacks, where he has gone to make trout Montbarry for a foreign ambassador at the special request of the [=US=] Secretary of State.
122** In "Too Many Detectives", it takes place in a hotel room in Albany, where he has been summoned to submit to questioning in a state investigation of illegal wiretapping.
123** In "The Impolite Corpse" (from the third radio series), it takes place at the murder scene because his client told him over the phone that Archie was in danger. Wolfe suspects (correctly) that this was a lie intended to get him over there, but had found the case so annoying that he was willing to just solve it right there and be done with it. [[spoiler:Incidentally, the fact that his client went to such lengths to make him leave his office is the pivotal clue that breaks the case.]]
124** In this series the trope's also well justified: Wolfe charges high fees (and occasionally is depending entirely upon the potential gratitude of non-clients for compensation), often seems to be doing nothing at all to earn them, and it's established in the setting that the local police and district attorney's office are very eager to take complete credit for anything he turns up and are at the same time looking for an excuse to bring him in for obstruction of justice. He has multiple reasons for wanting all interested parties in one place to report his activities to. (Not always truthfully.)
125* Peter Tremayne's ''Literature/SisterFidelma'' does this in every single novel, often drawing together bitter enemies who otherwise wouldn't be caught dead in the same room. She seems to be constitutionally unable to explain herself without every single character present, even if she has to browbeat a king into gathering these characters for her.
126* Played with in ''[[Literature/OldMansWar The Human Division]]'':
127-->'''Wilson:''' [[LargeHam Someone in this room is a killer!]]
128-->'''Lowen:''' [[DiscussedTrope Please don't say that when they actually show up.]]
129* {{Invoked| Trope}} and {{discussed| trope}} in Josh Lanyon's ''Somebody Killed His Editor'', in which the protagonist, mystery writer Christopher Holmes, reluctantly gathers everyone in a central location to talk through the murders and reveal his deductions as to the most likely suspect. Since the novel is set at a ''mystery writers' workshop'' (at which several dozen writers, publishers, and staff are trapped by weather in a remote California location), people quickly catch on ("He's going for the drawing room summary!") and there's much excited discussion and interruptions regarding his reasoning and methods. As Holmes is mostly playing for time anyway, as he wants to keep the killer and the potential victims in plain sight until help arrives, he doesn't mind too much. In the grand tradition of summation gatherings, he briefly pursues the RedHerring before focusing on the real culprit.
130[[/folder]]
131
132[[folder:Live-Action TV]]
133* Liz spends one ''Series/ThirtyRock'' episode watching ''Murder on the Orient Express'' and having a post-breakup one-night stand. At the end of the episode, she calls the entire cast into Jack's office and accuses [[EverybodyDidIt them all]] of orchestrating the one-night stand. The scene is a direct parody of the similar scene in ''Murder on the Orient Express'', with Liz presenting a "simple explanation and a complex explanation" for the one-night stand, with the simple explanation being that it just happened and the complex explanation being a conspiracy among everyone in the room to make her feel better, and eventually deciding to believe in the simple explanation even though the complex explanation is obviously correct.
134* ''Series/TheAfterparty'' spends the season following a complex (if comedic) murder mystery, and the season finale naturally has the eccentric detective gather all the suspects in the living room to explain who the killer is and how they did it. Also lampshaded as being unnecessary:[[note]]It's also [[DeconstructedTrope deconstructed]] a bit: [[spoiler:the killer [[ScrewThisImOuttaHere actively attempts to flee at the end]], though they don't get very far.]][[/note]]
135-->'''Danner:''' Good news, everyone. No more waiting. I know who the killer is.\
136'''Brett:''' I'm sorry. Are you just gonna tell us all as a group? As a first responder, that is highly unusual.
137* An InvokedTrope in ''Series/AlteredCarbon''. Takeshi Kovacs is coerced by the BigBad into framing someone else for the attempted murder of Laurens Bancroft, so he uses this trope to manipulate everyone. Kovacs surrounds Bancroft with a group of people who all have motive for harming him and stand to lose everything if they lose Bancroft's favor. When Kovacs accuses one of them, the others are relieved that the spotlight is off them and are greatly motivated not to question the evidence. They then try their best to convince Bancroft that Kovacs is right.
138* In the ''Series/{{Angel}}'' episode "Happy Anniversary" Wesley does this to determine which of the family members summoned a demon. Notable because the entire rest of this B plot happens off-screen, although it sounds [[NoodleIncident absolutely fascinating]]. After it's over, Gunn comments that summation was ''really'' cool... and Wesley admits he was saying the evidence out loud to work it out and didn't know who the guilty party was until he named her.
139* At the end of every episode of ''Series/{{Banacek}}'', Banacek would gather all of the suspects together at the scene of the crime to explain how the crime was committed and expose the guilty party.
140* Parodied in ''Literature/LessonsForAPerfectDetectiveStory'' as Tenkaichi demands a dramatic enough summation at the end of each episode to keep the audience happy. Fujii felt that calling people who were clearly not the murderer and not involved to the summation, so there's only two people at the end of the first episode. Tenkaichi refuses to explain who did it until enough people are gathered (including a girl walking her puppy) and even then [[spoiler:he didn't get a chance to reveal who was the murderer]]. Afterwards everybody leaves before he can explain how the LockedRoomMystery occurred except an old woman who didn't understand why anybody should care.
141* ''Series/DeathInParadise'': Detective Poole makes a habit of gathering all the people involved in the [[BodyOfTheWeek murderer of the week]] to identify the killer. In Season 3, his replacement Detective Goodman is startled at being prodded to do a summation gathering in Poole's style, but decides to keep the tradition going in later episodes. The third detective, Mooney, just does it without any explanation how he fell into the habit, while the fourth, Parker, is directly told to do it be the Police Commissioner, because by that point it's just how things are done on Saint Marie.
142-->'''Goodman:''' Camille, would you do that thing where you gather everyone together? I [[NotSoAboveItAll rather liked that]] last time...
143* ''Series/DoctorWho'': [[Recap/DoctorWhoS30E7TheUnicornAndTheWasp "The Unicorn and the Wasp"]] has Agatha Christie herself solving the mystery, but it's PlayedForLaughs thanks to Donna, who hasn't quite caught on and keeps accusing the wrong person.
144* Every episode of ''Series/ElleryQueen''.
145* Parodied on an episode of ''Series/{{Frasier}}'' when Frasier Crane calls together Niles, Daphne and Martin to reveal who is guilty of replacing a tape cassette of one of his radio shows. He exonerates Daphne and Martin and is about to accuse Niles when Daphne suddenly confesses. When Frasier shouts out, "A-ha!" Niles snarks back, "You don't get to say 'a-ha,' you thought it was me."
146* The ''Series/ItsAlwaysSunnyInPhiladelphia'' episode "Who pooped the bed" features one of these. [[spoiler: It turns out that the detective way overthought things.]]
147* In ''Series/KamenRiderDouble'' Akiko attempts one, but in addition to guessing the wrong person to be the MonsterOfTheWeek, she misses the fact that ''all'' of the season's [[BigBad Big Bads]] are also in the room.
148* ''Series/LawAndOrderCriminalIntent'': In "Palimpsest", Nichols stages one of these; gathering all of the suspects into the attic (ItMakesSenseInContext) to expose the murderer. This is probably the only time in the series this trope is used, but as it involves a murder in an old, book-filled mansion it seems to fit.
149* ''Series/LikelySuspects'' and the remake of ''Series/BurkesLaw'' had this regularly, of the type where the detective deals with the innocent people by ''accusing'' them, and then revealing the "accusation" to be a BaitAndSwitchComment.
150* ''Series/TheManFromUncle''. A variation in "The Mad Mad Tea Party Affair" - our heroes suspect a Thrush mole has planted a bomb in a conference room, but can't find it. So they gather all the suspects in that room and wait to see who panics first.
151* ''Series/{{MASH}}'':
152** The early episode "I Hate a Mystery" combines this with BluffingTheMurderer, although the crime in question is theft rather than murder.
153** In another episode, Hawkeye jokingly invokes this while watching a home movie of Frank Burns' wedding, as several of Burns' relatives are shown standing together onscreen.
154* ''Series/MarriedWithChildren'': Parodied, as with many other detective tropes, in the NoirEpisode "Al Bundy, Shoe Dick". After Al has been [[FrameUp framed for the murder]] of an old rich man, he gathers the man's family and ends up accusing all of them of being the real murderer. His reasoning is either non-existent or hilariously faulty (like accusing a man with two hook hands of holding the murder weapon, or a mentally disabled man of being a criminal mastermind), until he does prove himself with a bit of deductive logic that the FemmeFatale did it.
155* ''Los misterios de Laura''. Since Laura is a 20 years younger Miss Marple working at the police, she does that every time. Even in the couple of episodes when she quits the force.
156-->'''Suspect''': Why do we have to listen to a random person telling us we are all a bunch of murderers?
157-->'''Chief Detective''': Because I allow her to say whatever she wants.
158* Occurred occasionally in ''Series/MurderSheWrote'', although Jessica generally preferred an EngineeredPublicConfession.
159* ''Series/MurdochMysteries'': Murdoch has Crabtree summon the family and staff of the Jenkins household for one of these at the end of "Downstairs, Upstairs".
160* A subversion appears in ''Series/{{NCIS}}'', during the sting operation that identified [[spoiler: Agent Lee]] as TheMole. Having summoned every potential culprit together, the Director has their hands tested for evidence, and identifies the innocent [[spoiler: Abby]] as the guilty party, allowing the team to follow the ''actual'' suspect once the fake one is in custody and the Mole thinks the internal investigation is over.
161* ITV's ''Series/{{Poirot}}'' and ''Series/{{Marple}}'' not only adapts the Summation Gatherings from Creator/AgathaChristie's novels, but often adds them to stories that did not originally have them (such as ''Literature/DumbWitness'' and ''Literature/MurderIsEasy'') and sometimes expands upon them so that ''all'' the suspects are present, instead of just a few like in the novels (''Literature/TakenAtTheFlood'', ''Literature/LordEdgwareDies'').
162* Standard way Shawn and Gus close a ''Series/{{Psych}}'' investigation.
163* In an episode of ''Series/{{Seinfeld}}'', George plots an elaborate setup to prove a mechanic stole his Twix bar. It's ruined when he leaves the room...
164-->'''Saleswoman:''' Hey Willy, check it out! Free candy!\
165'''George:''' That's my candy lineup! Where are all my cards? They're all on the floor! ''And you!'' How many Twix does that make for you today? Like eight Twix?\
166'''Mechanic:''' No.\
167'''Man:''' Hey, this Clark bar is good!\
168'''George:''' It's a Twix! They're all Twix! It was a setup! A setup, I tell ya! And you've robbed it! You've all screwed me again! Now, gimme one! Gimme a Twix!\
169'''Mechanic:''' They're all gone.\
170'''George:''' [[SkywardScream TWIX!!!]]
171* ''Series/{{Sherlock}}'': Sherlock arranges a SummationGathering to solve the mystery and identify the culprit in the [[Recap/SherlockS04E01TheSixThatchers first episode of series 4]]. Subverted when the cornered guilty party responds by [[spoiler: shooting and killing Watson's wife Mary]].
172* President Bush pulls this in one episode of ''Series/ThatsMyBush'' to figure out who has been trying to murder him. After going through everyone present, he eventually arrives at the conclusion that it was [[ShaggyDogStory no one]].
173* ''Series/ThatMitchellAndWebbLook'': The ''Poirot'' example is spoofed in one sketch where a detective gathers everyone to reveal that after a whole week, he's got ''no'' clues ("It's been a hell of a week, to be honest with you.") He only knows he's caught the perp when they start doing "The Evil Voice".
174* Lampshaded in ''Series/TropicalHeat'', when the detective, Nick asks that the suspects be gathered in one room, and his friend Spider asks derisively if he's going to do "that whole Agatha Christie summation thing".
175* A variant in the ''Series/VeronicaMars'' episode "An Echolls Family Christmas": She figured out who stole the game pot from the poker game, and suggests that they all show up for another game, and whoever is revealed to have stolen it will be kicked out and will have effectively bought ''her'' into the game.
176[[/folder]]
177
178[[folder:Radio]]
179* ''Radio/BleakExpectations''' series five opener, featuring a country house soiree at which [[TenLittleMurderVictims guests keep dropping like flies]]. By the time he's done doing his summation, everyone else but his family is dead.
180-->'''Sir Phillip Bin:''' I gathered the guests in the {{denouement}}arium...
181* ''Radio/JohnFinnemoresSouvenirProgramme:'' One storyteller sketch, which skips over all the plot in favour of getting to the bit where the culprit is found, gets to this bit, starting with the inspector "who makes an obviously wrong deduction for [the narrator] to pour scorn on". It soon turns out everyone is someone else in disguise. [[spoiler:The Storyteller is the actual thief everyone's looking for.]]
182[[/folder]]
183
184[[folder:Theatre]]
185* Inspector Goole does this to everybody all the time in ''Theatre/AnInspectorCalls''. Pretty much the entire plot is one.
186[[/folder]]
187
188[[folder:Video Games]]
189* In an early quest of ''VideoGame/BatenKaitosOrigins'', the characters are investigating a series of terrorist attacks from a neighboring town, and hold several of these as new information comes to light.
190* In the freeware game ''Disorient on the Murder Express'', the detective gathers everyone to the fireplace at the rear of the train [[spoiler:to explain how they ''[[EverybodyDidIt all]]'' tried to murder the victim for their own reasons, contributing to his death. Then [[FridgeLogic they all shoot him.]]]]
191* In Chapter Three of ''VideoGame/LimboOfTheLost'' Briggs calls everybody to the Town Hall to reveal who's been killing everybody.
192* ''VideoGame/ProfessorLayton'' (chiefly the games, though there's a spectacular one in [[Anime/ProfessorLaytonAndTheEternalDiva the movie]]) have these, though they never ''really'' bring closure to the mystery, since the BigBad always runs off before they can be apprehended.
193* In the 1983 DOS game [[http://en.wikipedia.org/wiki/Sleuth_%28video_game%29 Sleuth]], you have to hold one of these to accuse your suspect. To win the game, the gathering ''must'' be held at the scene of the crime, you ''must'' be carrying the murder weapon, and you ''must'' accuse the right person; if one of these details is wrong, the killer will [[TooDumbToLive confess to the crime while chastising you for your mistake]].
194* The final page in ''VideoGame/TheSmellyMystery'' (a combination interactive storybook and detective game for kids) features this, with Little Monster Private Eye and Detective Kerploppus gathering all five suspects into the living room at Yalapappus Manor so they can reveal which one has been going around as the Evil Smell Switcher.
195[[/folder]]
196
197[[folder:Visual Novels]]
198* Subverted in Episode 5 or ''VisualNovel/UminekoWhenTheyCry''. All the elements of the trope are in action, including the revealing of the culprit's shameful secrets. Except a tiny, insignificant detail: [[spoiler:the "obvious culprit" is actually innocent]]. Not that the Episode's detective has the slightest concern for such trivialities.
199* ''VisualNovel/ZeroEscape'':
200** ''VisualNovel/NineHoursNinePersonsNineDoors'' has one [[spoiler: in the "Safe" ending, Junpei attempting to prove who killed Guy X.]]
201** ''VisualNovel/VirtuesLastReward'' has one [[spoiler: in Luna's ending.]] Unusually for this trope [[spoiler: it's just two people, Sigma and Luna, since Phi left with Quark and everyone else was already dead. And it's even inverted in that Sigma actually points out all evidence that Luna DIDN'T commit the murders]].
202[[/folder]]
203
204[[folder:Webcomics]]
205* ''Webcomic/BasicInstructions'' [[http://basicinstructions.net/basic-instructions/2009/1/19/how-to-reveal-the-killers-identity.html provides some suggestions]].
206* In the ''Webcomic/{{Housepets}}'' storyline "Let's Imaginate ''Literature/AndThenThereWereNone''", the police inspector played by King [[https://www.housepetscomic.com/comic/2014/02/28/how-every-murder-mystery-ends/ insists on doing this]], despite, well, [[TenLittleMurderVictims the clue's in the title]].
207* ''Webcomic/TriangleAndRobert'': Parodied.
208-->'''Triangle:''' I guess you're wondering why I've gathered you all here.\
209'''Passenger:''' To reveal the murderer.\
210'''Triangle:''' Well, okay, you're not wondering then.
211** Triangle then attempts to lay out the evidence, but keeps getting interrupted and losing track of where he's up to, and eventually jumps straight to saying who did it without finishing the explanation of how he knows.
212* ''Webcomic/TwistedTropes'': The detective gathers people in the room and accuses a [[ObviouslyEvil guy]] in a [[Franchise/FridayThe13th hockey mask and axe]] being the killer. In the next panel everyone is dead.
213[[/folder]]
214
215[[folder:Western Animation]]
216* ''WesternAnimation/{{Animaniacs}}'''s ''Hercule Yakko'' has fun with this: Yakko dramatically whispers he knows the location of Marita's missing diamond and orders the ship's passengers to be assembled in the State Room: but not to reveal the thief, but because he didn't have enough people to play charades, and [[spoiler:also to say none of them took the diamond, but he will turn the room upside down to prove the diamond is there; once everyone has fallen to the ceiling the diamond appears; Marita was sitting on it the whole time]]
217* A teaser to ''WesternAnimation/BatmanTheBraveAndTheBold'' was in set in one of these to discover who stole a gold skull. Turns out almost everyone was lying about something anyway. [[spoiler: It was False Face who took the skull.]]
218* ''WesternAnimation/DallasAndRobo'': "Murder on the Georgia Overdrive" has Dallas Moonshiner holding one. It turns into a massive {{Infodump}} on the suspect passengers but is subverted when she utterly fails to solve the case. The one she accuses is not even there because they've been murdered off-screen.
219-->'''Dallas:''' What do you want from me, I'm drunk. I've had a dozen martinis.
220* The current page quote appears in the ''WesternAnimation/{{Futurama}}'' episode "[[Recap/FuturamaS2E16AnthologyOfInterestI Anthology of Interest I]]". The room it takes place in appears again in "The 30% Iron Chef", where it is referred to as "the accusing parlor".
221* Daffy tries this on his neighbors in ''WesternAnimation/TheLooneyTunesShow'' episode "Newsapaper Thief." His failure to plan ahead means that he has to constantly intervene to correct errors in his planning.
222* When Moomintroll solves the supposed murder of Mrs Fillyjonk in the ''[[Literature/TheMoomins Moominvalley]]'' episode "The Strange Case of Mrs Fillyjonk", he gathers everyone in her parlour and then says "I suppose you're wondering why I've gathered you here today." The Hemulen Jailer points out that he ''told'' them why he gathered them there when he gathered them.
223* ''WesternAnimation/MyLittlePonyFriendshipIsMagic'':
224** Near the end of the episode "[=MMMystery=] on the Friendship Express", Twilight Sparkle calls for one of these after finding clues to who sabotaged the cake Pinkie Pie was guarding.
225--->'''Mulia''': Erm, why are we all here again?\
226'''Twilight''': ''(entering the room)'' I bet you're wondering why you're all here again.\
227'''Joe''': She's ''good''.
228** Done again in "Too Many Pinkie Pies" after the Pinkie clones have been rounded up in the town hall.
229[[/folder]]

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