That One Case: Difference between revisions

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{{trope}}
{{quote|"The case that makes you and the case that breaks you… The one you never solve, the one that keeps you awake at night. The case that gnaws at your guts and ruins your marriage. The case that keeps you propping up a bar as you relive the what-ifs, the might-have-beens, the half-leads and half-truths. The case that other cops murmur about whenever you walk past. The case you never… ever... discuss."|'''Herschel Biggs''', ''[[LAL.A. Noire]]''}}
 
A veteran detective is haunted by that case they could never solve (or perhaps it was solved officially, but the guy thinks something isn't right) and it haunts them to this day. Nearly always a serial killer (or at least a very gruesome murder) and/or [[It's Personal|personal]]. Even when they are officially off the clock, they will still work the case on their "free" time, because it is that important to them. If they are told to leave the case alone [[Turn in Your Badge|they may get fired over it]], but still continue even when they are not a cop anymore. [[Sub-Trope]] of [[My Greatest Failure]].
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** Kogoro's That One Case ended with a [[Shoot the Hostage]]; he quit and separated from his wife soon after this. The [[Non-Serial Movie]] "The Fourteenth Target" circles around the suspect supposedly taking revenge for this incident.
** Sato has ''two'' That One Cases, both of them "inherited": in one, her father perished chasing the suspect from a bank robbery, and in another, she lost her former partner to a serial [[Mad Bomber]] (who himself had an earlier That One Case that lost ''his'' prior partner).
** Subverted with Megure's That One Case, where a serial hit-and-run driver critically injured both himself and the girl who offered herself up as bait--turnsbait—turns out that was how he met his wife and he's embarrassed to tell the tale.
** Conan himself considers the death of {{spoiler|Ai's sister}} and his inability to stop the murderer of the Moonlight Sonata from committing suicide his [[My Greatest Failure|greatest failures]].
* [[Implacable Man|Runge]] in ''[[Monster (manga)|Monster]]'' believes that Dr. Tenma is a [[Serial Killer]] and chases after him relentlessly. It gets to the point where his wife and daughter leave him.
 
== Comics ==
* ''[[Sin City]]: That Yellow Bastard'' is all about [[That One Case]] for John Hartigan: a serial child rapist/murderer who happens to be the son of one of the most powerful people in Sin City.
* An occasional form of plot in [[Batman]] comics.
** In ''[[Gotham Central]]'', a young detective is dragged into a cold case when the survivor of a horrible school bombing from years before specifically asks for him before killing himself. When he and his partner re-open the case, which had never been solved, they have to bring in [[Cowboy Cop|Harvey Bullock]], the cop who originally worked the case and who has most of the evidence in his personal possession. It is revealed that this is Bullock's One Case, which he claims he "brought home with him" even after he left the force. Bullock's inability to solve the case, even now, [[Driven to Suicide|pushes him over the edge]].
** In the ''Nightwing'' series, Nightwing resolved the One Case of a cop in time for the man's retirement party, so he wouldn't let the unresolved case eat him alive.
** During the ''Bruce Wayne: Fugitive?'' storyline, [[Secret Identity Identity|Batman]] was called to the bedside of an old dying cop who had been the one to talk to Bruce after he'd [[Death Byby Origin Story|witnessed the murder of his parents]]. The man asked Batman to [[Clear My Name|clear Bruce Wayne's name]] in memory of the case he'd never been able to resolve, saying that the child he'd seen on that night could not have grown to be a murderer.
 
== Film ==
* ''The Pledge'' is based on this premise, with the detective's obsession with his last case eventually driving him insane.
* in ''[[Who Framed Roger Rabbit?]]'', Eddie Valiant is haunted by his brother's murder at the hands of an insane toon who was never identified or apprehended. This makes him bitter, led to him drinking, and gave him a biased dislike of toons, who he refused to work for afterwards. {{spoiler|At the climax of the movie, however, he discovers that the killer was [[Big Bad| Judge Doom]].}}
 
== Literature ==
* Paula Myo chases Adam Elvin and the Guardians of Selfhood in the ''[[Commonwealth Saga]]'' by ''[[Peter F. Hamilton]]''. The case is not so much unsolved as open, because she can't catch the perpetrators - but it is firmly established that it is Paula's only case not closed by an arrest and conviction. The child/gruesome murder angle applies, but not as you might think.
* The Girl with the Dragon Tattoo features two; the murders of Rebekka Jakobson and Harriet Vanger. Both of the cases were fretted over by different cops, to the same effect; even long into retirement, neither case was solved nor dropped by the head investigator until the titular Salander came along.
 
== [[Live Action Television]] ==
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* In ''[[Monk]]'' Trudy's murder is the only one the main character has not solved, and it's haunted him for many years. He only manages to solve it in the [[Grand Finale]].
* ''[[Veronica Mars]]'' has this with the Lily Kane case in Season 1.
* [[Law and Order: Criminal Intent]]: Sort of an informed [[That One Case]], Alex's husband was shot in the line of duty, and a later case made a plot point out of the circumstances surrounding said shooting.
* The main character in ''[[The Mentalist]]'' with the "Red John" case, which resulted in the murder of his wife and child.
* In the ''[[House (TV series)|House]]'' episode "All In," House chases the medical case that he was never able to solve: a young boy comes in exhibiting the same symptoms as a patient House earlier lost.
* ''[[Criminal Minds]]'' has a couple of these:
** Agent Ryan, though not a regular, is still obsessed with a serial killer case he never solved.
** Agent Rossi, who ''is'' a regular, has been haunted most of his career by the brutal murder of a couple in a house while their children were sleeping, then cleaned the murder weapon and any forensic evidence and left without waking them. {{spoiler|It turned out that the killer was a circus clown with a childs mind, who followed the children home to play with them and killed the parents because they frightened him after they found him in the house with a weapon the father was holding; the scene had been cleaned by the father of the clown to avoid sending his handicapped son to jail. They were caught because the clown had been sending childish presents like teddy bears every year to apologise}}.
** Hotch has The Boston Reaper.
*** {{spoiler|Hotch ''had'' the Boston Reaper. He's closed [[That One Case]] now, albeit at great personal cost.}}
** Reid had a weird example: the murder of Riley Jenkins. It actually occurred when he was 4 years old and he'd consciously forgotten about it. However, he had a [[Bad Dreams|recurring nightmare]] about investigating the murder of a child, and it turned out to be Riley Jenkins in the dream. When he realized this, he consciously agonized over the case until he solved it.
* Martin in ''[[Frasier]]'' continued to pore over the Weeping Lotus Case during retirement, and eventually solved it with a bit of help from Frasier. Admittedly Frasier's aid consisted of accidentally rearranging the crime scene photos so that Martin realized what he'd been missing, then coming up with a theory that the woman had been killed a by gorilla trained to use a gun ([[Captain Obvious|she wasn't]]).
* In [[Homicide: Life Onon the Street|"Homicide"]], Bayliss had the Adena Watson case.
** [[Truth in Television]], unfortunately. The real Baltimore child-murder which inspired the Adena Watson storyline was never closed. Getting word out about [[That One Case]] is one of the reasons why the real-life Baltimore Homicide Division was supportive of the true-crime book about their work.
* ''[[Inspector Morse]]'' has a subverted example: the short story "Morse's Greatest Mystery" is about the 'one case he never solved' which is something as minor as someone stealing £20 from a Christmas charity box. Morse claims to have got the culprit, but it turns out he just replaced it with his own money. It turns out the "mystery" of the title refers to the cynical, materialist Morse beginning to understand altruism.
* Played with in [[Castle]]; Det. Beckett's mother was murdered, providing her [[Freudian Excuse]], but she decided to stop looking at her mothers case because it was driving her crazy, and forbids anyone else from looking at it. Still unsolved as of this point. {{spoiler|1=Although Castle did make some headway, he lost Beckett's friendship because of it. [[Status Quo Is God]], however, and getting back together is the emotional subplot of S2E1.}}
** As of S2E13, {{spoiler|Beckett found the killer, a professional assassin, but was forced to shoot him to save Castle... before he could tell her who had hired him. Castle tries to quit after this incident, but Beckett tells him that [[Crowning Moment of Heartwarming|she wants him around when they find the employer]]. Of course, if he tells anyone she said that there will be another shooting...}}
* The ''[[Fringe]]'' episode "Earthling" deals with Broyles's [[That One Case]] from years ago that he obsessed over so much it destroyed his marriage. The team eventually solves it, though it turns out to involve a government conspiracy and a [[Living Shadow]] {{spoiler|radiation-eating alien}}.
* The episode "Name" of ''[[Law and Order Special Victims Unit]]'' has Stabler team up with a random [[Lab Rat]], Millie, to help solve her deceased father's One Case--theCase—the murder of an unidentified Hispanic boy. The case so deeply affected Millie's father that he'd memorized the boy's fingerprints, helped pay for his gravestone, and obsessed over both solving the murder and identifying the victim until he died. In the end, {{spoiler|they link the case to several others and get the murderer, but he's already dying of cancer and it's been so long that he can't remember who the boy was. Millie blames her childhood resentment of the way the boy's case ate up her dad's time}}.
* The fourth season of ''[[Dexter]]'' revolves around ex-Agent Lundy trying to track down the "Trinity Killer" who has murdered three people a year for the last fifteen years ( {{spoiler|later revealed to be four people a year for the past ''thirty'' years}}), who he was never able to convince his colleagues actually existed. {{spoiler|After he is killed for getting too close, Debra resolves to solve the case in his honor}}.
* The ''[[NCIS]]'' episode ''Lt. Jane Doe'' has Ducky cancelling a trip to a conference in Britain to stay and investigate when a murder victim turns out to have a trident mark on her neck (and be a civilian dressed in naval uniform), just like the victim of a 10-year-old unsolved case he worked on. {{spoiler|it turns out that new murder was a crime of passion by the daughter of the original case's lead investigator, and she planted the evidence to link to the older case. The original killer (but not the original victim) is finally identified as a result of the new investigation.}}
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== Video Games ==
* ''[[Ace Attorney]]'' has the SL-9 and DL-6 incidents, while Apollo Justice has {{spoiler|the case where Phoenix got disbarred}}.
** There's also the KG-8 case in ''Ace Attorney Investigations''. The twist is that it actually did get solved {{spoiler|(Manny Coachen did it)}} but the case was dismissed due to lack of evidence. {{spoiler|This is what led Faraday, Badd, and Yew to form the Yatagarasu.}}
** The sequel, ''Gyakuten Kenji 2'', introduces the IS-7 incident, {{spoiler|which was the final case Gregory Edgeworth worked on and brought about Manfred von Karma's only penalty in court. Miles Edgeworth would discover the truth behind the incident 18 years later, and how it ties into the motives of the game's [[Big Bad]].}}
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{{reflist}}
[[Category:Crime and Punishment Tropes]]
[[Category:That One Case{{PAGENAME}}]]