Diabolique
The cruel and abusive headmaster of a boarding school, Michel Delassalle, is murdered by an unlikely duo -- his meek wife and the mistress he brazenly flaunts. The women become increasingly unhinged by a series of odd occurrences after Delassalle's corpse mysteriously disappears.
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Diabolique (1955) is a mystery, thriller movie running 1h 58m. Starring Véra Clouzot, Simone Signoret, Paul Meurisse. Rated 7.9/10 on TMDB. Watch it online free on ZapFlix.