Henri-Georges Clouzot's cool, clammy, twisty 1955 thriller Diabolique is an almost perfect movie about a very nearly perfect murder, a film in which the artist's methods and the killers' are ideally matched, equal in cunning and in ruthlessness. The screenplay, adapted by Clouzot and three other writers from a novel by the crack French crime-fiction team of Pierre Boileau and Thomas Narcejac, is a fantastically elaborate piece of contrivance, but the scrupulous realism of the direction makes the unnatural tale somehow feel entirely likely.