->'''''Leonard Vole''': But I've done nothing! This is England! You don't get arrested or convicted for something you haven't done!\\
'''Sir Wilfrid''': We try not to make a habit of it.''

A short story by Creator/AgathaChristie, made into a 1953 play, which was then adapted into a 1957 film.

Leonard Stephen Vole, an amiable and good-natured blood donor with an excellent war record, has been charged with murder. The victim: Miss Emily French, a lonely but wealthy widow with whom Leonard had become friendly recently. Unfortunately for Leonard, it is revealed that Miss French had left Leonard eighty thousand pounds, making for quite a motive. Leonard's case rests entirely on circumstantial evidence, and his acquittal relies on the testimony of his cold and calculating German wife, Christine Vole (her first name is Romaine in the short story and play), who is the only person who can provide an alibi. Leonard and his solicitor seek the advice of London's best and most experienced barrister, Sir Wilfrid Robarts, who takes Leonard's case himself despite his rapidly deteriorating health.

What follows is a three-day trial, during which time the prosecution makes a convincing case for Leonard's guilt and Sir Wilfrid attempts to prove his innocence. After some time, a surprise witness is called, and twist after twist keeps everyone in the courtroom - and the audience - on the edge of their seats.

The film version was directed by Creator/BillyWilder and starred Tyrone Power as Leonard, Creator/MarleneDietrich as Christine and Creator/CharlesLaughton as Sir Wilfrid. Tyrone Power's last film, as he suffered a fatal heart attack on the set of his next production, ''Film/SolomonAndSheba''.

Incidentally, as this film is over 50 years old, nothing below is spoiler-tagged. If you ever plan to see it, don't read anything further.
!!This film provides examples of:

* TheAdventureContinues: The film ends with Sir Wilfrid declaring that he will be acting as the defense for Christine Vole.
* AmoralAttorney: Averted. Mr. Meyers, the prosecuting attorney, is actually a very polite and civil man. He's just doing his job.
* AnnoyingPatient: Sir Wilfrid, who screams at Mrs. Plimsoll and sabotages her treatment. (Granted, she does get rather twee, but she's also trying to avert another heart attack.)
* BatmanGambit: Sir Wilfrid tells Christine that while she can't be forced to speak against her husband, the testimony of a loving wife will count for very little in a murder case. So she plays a cold, unfaithful wife who is then discredited by new evidence to "prove" Leonard's innocence.
* ChekhovsGun: The ham knife. Sir Wilfrid uses a bluff about it to get Christine to incriminate herself as the letter writer, then Christine uses the knife to stab Leonard.
* ChekhovsGunman: The emotional young woman sitting behind Mrs. Plimsoll in court is Leonard's lover.
* CitizenshipMarriage: Testifying for the prosecution, Christine claims this as her only motive for marrying Leonard, and that she was already married to a man in Germany. While the marriage ''did'' get her to England, she does genuinely love him.
* CourtroomAntics: Mild compared to some cases, but Sir Wilfrid plays a few tricks during the trial. Leonard also loudly contradicts Christine's testimony from the gallery, for which the judge does threaten to throw him out of court.
* DeadpanSnarker:
** Sir Wilfrid.
** The judge gets in a good one when he's asked by a witness if he could expedite her getting a new hearing aid.
--->"With all the rubbish being talked about these days you're not missing much."
* DoNotSpoilThisEnding: When the film was released it ended with a voiceover urging audiences not to reveal the twist ending.
* TheEndingChangesEverything: And how it does.
* ExactWords: Everything Christine says under oath is true, even when it seems to be self-contradictory or misleading. She really did see Leonard come home at the time she said he did; she really doesn't know anyone named Max, and any letters allegedly written by her to him are forgeries; and she really did write a letter to "Max" which seems to clear Leonard of the murder.
* GenreSavvy: Sir Wilfrid suspects ''something'' is too good to be true about the DeusExMachina delivery of surprise evidence to him after Christine's testimony, though he doesn't actually solve the puzzle.
* GoodLawyersGoodClients: Sir Wilfrid only decides to defend Leonard Vole after he's convinced of his innocence.
* HesDeadJim: Nine seconds of pulse taking were sufficient to declare Leonard dead.
* HighClassGlass: Sir Wilfrid sports one of these, and [[ScaryShinyGlasses uses it]] when interviewing clients.
* HollywoodLaw: Surely a barrister of Sir Wilfrid's experience could have gotten Christine's testimony for the prosecution disallowed by arguing that since Leonard Vole did not know she was already married, that would make her his putative spouse and thus SpousalPrivilege would still apply.
* HomemadeInventions: Leonard's combination eggbeater-and-separator. He's having trouble funding it and hoped Mrs. French would give him the financial backing he needed.
* ItAmusedMe: Leonard meets Mrs. French by shaking his head and nodding when he sees her trying on hats inside a shop, just for grins. (He thought both hats were ugly.) They only meet again by chance in a theater.
* IOweYouMyLife: How Leonard and Christine's relationship started; their marriage allowed her to escape post-war Germany.
* LiteralMetaphor: When Leonard describes his first meeting with Christine, he says "the roof fell in on me." In the ensuing flashback, he certainly seems [[LoveAtFirstSight smitten from the get-go]]... and then he accidentally knocks over the chair holding up the ceiling in Christine's apartment, causing the roof to actually fall in on him.
* ManipulativeBastard: Leonard twists both Christine and Wilfrid around in different ways.
* MasterActor: Christine and Leonard both.
* MotorMouth: Miss Plimsoll is capable of carrying on both sides of a conversation by herself and bringing it to a rapid conclusion.
* MyGodWhatHaveIDone:
** Christine claims this as the reason she testifies against Leonard in court when she backed up his alibi to the police: she might owe him, but she can't perjure herself for a murderer.
** Sir Wilfrid is incensed when he learns that he's acquitted a thoroughly guilty man.
* NotEvenBotheringWithTheAccent: Despite dialogue that uses distinctly British words and turns of phrase, and nothing in the movie suggesting his character is anything but English (he was in the RAF), Tyrone Power speaks with his native American accent.
* NoExceptYes: When Sir Wilfrid accuses Mrs. [=McKenzie=] of being antagonistic towards Leonard from the start, she denies it--then calls him a shiftless, scheming scoundrel, but she's ''not'' "antag'nistic".
* NotSoStoic: Christine's calm breaks only twice. First is when the letters from Max are revealed and show her testimony against Leonard as a lie, and she shrieks "''DAMN YOU!''" across the courtroom. But this was an act. The second time is when Leonard callously dumps her for a girl he met shortly before the murder, and it's genuine—she's shattered by the betrayal, and then she murders him.
* OldRetainer: Mrs. [=McKenzie=] was Mrs. French's housekeeper of ten years. She disliked Leonard from the start, and Wilfrid paints her as being biased because she was cut out of Mrs. French's will in favor of Leonard.
* [[ScaryShinyGlasses Scary Shiny Monocle]]: Sir Wilfrid uses this to test potential clients for their honesty. Leonard passes, but Christine cuts it short by closing the blinds to stop him reflecting it in her eyes (a failure). In the end, it proves to be an unreliable gauge of their characters.
* ShesGotLegs: American servicemen in the shabby Berlin club where Christine is playing demand to see her legs, and get drunk enough to actually rip her pants off. This scene was written into the movie specifically for some Marlene Dietrich {{Fanservice}}.
* SignificantDoubleCasting: Yep, that's Dietrich selling letters.
* TheSociopath: Christine poses as one, manipulating two men to do her bidding (marrying her and attacking an ex), lying without any effort, and having no empathy at all for Leonard. But it's Leonard who's the true sociopath. He's an admitted drifter who befriended a lonely widow for amusement, and then let her make him a pet when he learned of her vast wealth, in hopes of funding his {{Homemade Invention|s}}. Shortly thereafter he got her to put him in her will and then murdered her. Up until the end he plays the role of desperate innocent without fault. When Sir Wilfrid expresses his horror and outrage at having acquitted such a scoundrel, Leonard casually brushes it off and offers to cover him in gold. He's similarly guilt-free when he reveals that he's been having an affair for months and intends to leave Christine, even though he relied on her unquestioning love to perjure herself for him. No wonder she stabs him.
* TheStoic: Christine appears to be unaffected by ''anything''—when she learns of Leonard's arrest, she's so calm that Sir Wilfrid decides he does not want her near the stand at all. And when she's pulled from an angry mob after the trial, her only complaint is that they laddered her last pair of stockings.
* SurpriseWitness: Christine twice over, once when she's unexpectedly called by the prosecution, and once when Sir Wilfrid recalls her.
* TimePassesMontage: Marked by the number of Sir Wilfrid's pills (taken on the hour) that remain.
* TitleDrop: At the end, when Christine reveals to Sir Wilfrid that she wanted to be a witness for the prosecution, because a supportive wife wouldn't have been believed.
* TwistEnding: And you thought ''Film/TheUsualSuspects'' was a MindScrew.
** BornInTheTheater: A voiceover during the end credits encourages viewers not to [[{{Spoiler}} Spoil]] the ending in the name of "the management of this theater."
* ThisCannotBe: Sir Wilfrid's immediate reaction when Christine reveals that Leonard really did murder Mrs. French.
* UndyingLoyalty: Christine doesn't care that Leonard murdered someone in cold blood; she'll do anything for him because she loves him. When he betrays her, though....
* UngratefulBastard: Christine, for testifying against her husband when he rescued her from postwar Germany. But really, it's Leonard, who ditches Christine for another woman even as she's perjuring herself for him.
* TheVamp: Christine.
* WigDressAccent: Christine's Cockney disguise. Sir Wilfrid doesn't realize it until Christine gives him an encore after the trial.
* WhamLine: "No, Sir Wilfrid, you do not understand at all. I knew [Leonard] was guilty."
* WhatTheHellIsThatAccent: The woman who sells new evidence to Sir Wilfrid is making a truly ''atrocious'' attempt at a Cockney accent.
* WorthyOpponent: Mr. Meyers has a good deal of professional respect for Sir Wilfrid.