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''Les Diaboliques'' ("The Devils"), also known as ''Diabolique'', is a French suspense-thriller made in 1955 and directed by Henri-Georges Clouzot. Christina and Nicole, respectively the wife and [[TheMistress mistress]] of Michel the JerkAss school headmaster, conspire to kill him. However, after they carry it out, his body disappears, and then things just get weirder. Christina and Nicole were played by Vera Clouzot and Simone Signoret.

[[TheRemake Remade]] as ''Diabolique'' in 1996 with Sharon Stone as Nicole the mistress, Isabelle Adjani as Mia the wife, Chazz Palminteri as the brutish husband, and Kathy Bates as the police detective.
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!!This movie contains examples of:

* CutHimselfShaving: Nicole gives a lame excuse for a black eye that was apparently caused by Michel.
* DoNotSpoilThisEnding: Translated from French, the final title card after the film reads:
-->Don't be diabolic yourselves! Don't ruin the interest your friends could take in this film. Don't tell them what you saw. On their behalf, we thank you.
* TheEndingChangesEverything: [[spoiler:The whole movie is a plot by Michel and Nicole to kill Christina. She has a weak heart, which they use to frighten her to death.]]
* EnforcedMethodActing: For the scene where the staff and students are served spoiled fish, Clouzot reportedly forced the actors to consume the genuine article.
* FakingTheDead: [[spoiler:Michel wasn't dead at all. It was a trick to fool Christina.]]
* FocusGroupEnding: The remake completely changes (and arguably ruins) the ending. [[spoiler:Mia doesn't die, Nicole panics, and in the end Mia and Nicole drown Guy (the husband) in the pool, for real. The detective then helps them cover it up.]]
* FrightDeathTrap: [[spoiler:Christina, driven wild by fright, has her fatal heart attack after Michel rises from the tub.]]
* {{Gaslighting}}: [[spoiler:Nicole and Michel are plotting to drive Christina mad with fear.]]
* GenderFlip: Kathy Bates as the Fichet-{{Expy}} in the 1996 remake.
* HollywoodHeartAttack: Averted. [[spoiler:The fatal heart attack at the end is ''disturbingly'' realistic.]]
* HomoeroticSubtext: The film implies that Christina and Nicole are lovers--one scene shows them in the same room in pajamas, and later they speak of running away together. This is however never expressly portrayed or stated. Some things you couldn't do in 1955, even in France.
* MindScrew
* NothingIsScarier: The tension when Christina is wandering through the deserted halls of the school at night, looking for Michel, is incredible.
* NotQuiteDead: Possibly. The film hints that [[spoiler:the wife might have ''survived'' her heart attack. (Or that the kid saw her ghost. Or that the kid is a liar.)]]
* ObfuscatingStupidity: Fichet, the detective, employs a bit of this. (More than one observer has noted the character's similarity to Series/{{Columbo}}.)
* PoliceAreUseless: It's good that Fichet heard [[spoiler:Michel and Nicole discussing their plot]], but it would have been better if he'd stepped up before [[spoiler:Christina keeled over and died]].
* RapeDiscretionShot: The film implies that Michel rapes Christina after the dinner with the fish.
* ReverseWhodunnit: What happened to Michel's body? What's going on?
* ScreamingWoman: Christina, when the lights go out just after she finds Michel's name written over and over on the typewriter during the climax.
* SpookyPhotographs: Michel's ghostly face appears in the class portrait.
* TwistEnding: [[spoiler:Michel and Nicole have been in cahoots all along.]]
* WouldHitAGirl: Michel slaps Christina after she spills alcohol on his suit--it's drugged, and she was trying to stop him from drinking it. She then goes ahead and lets him drink.
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