The greatest film that Alfred Hitchcock never made, Henri-Georges Clouzot's Diabolique is set in a provincial boarding school run by headmaster Michel Delasalle (Paul Meurisse). A ruthless lothario, he becomes the target of a murder plot concocted by his long-suffering invalid wife Christina (Vera Clouzot, the director's own spouse) and his latest mistress, an icy teacher played by Simone Signoret. A dark, dank thriller with a much-imitated "shock" ending, Diabolique is a masterpiece of Grand Guignol suspense. The simple murder plot goes haywire, and Michel's corpse disappears, prompting strange rumors of his reappearance which grow more and more substantial as the film careens wildly towards its breathless conclusion. Later remade as a greatly inferior 1996 Hollywood feature with Sharon Stone and Isabelle Adjani.
~ Jason Ankeny, All Movie Guide