- Two women drive from the outskirts of Paris to Niort, the birthplace of director Henri-Georges Clouzot.
- The film is based on Pierre Boileau and Thomas Narcejac's novel "Celle qui n'etait plus" (She Who Was No More). 'Hitchcock, Alfred' also attempted to buy the rights to this novel; Boileau and Narcejac subsequently wrote "D'Entre les Morts" (From Among the Dead) especially for Hitchcock, who filmed it as Vertigo (1958).
- When director Henri-Georges Clouzot bought the film rights to the original novel, he reportedly beat Alfred Hitchcock by only a matter of hours.
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