Les Diaboliques (The Fiends)
Director. Henri-Georges Clouzot
Michel Delassalle is the cruel and abusive headmaster of a boarding school owned by his wife, Christina. He treats his spouse with disdain and enjoys an affair with teacher Nicole Horner, who he bullies just as badly. The two women conspire to kill Michel and then hide his lifeless body in the school's swimming pool... except the headmaster's lifeless body vanishes. Then private detective Alfred Fichet takes an interest in the case.