Tony Wendice, a former playboy and tennis star, is burning through the money of his beautiful wife Margot. He resorts to crime when he learns that he could lose her millions, as Margot has become infatuated with American mystery writer Mark Holliday. Tony devises a plan for the perfect murder, finds a reliable hitman, and arranges an impeccable alibi for himself. He anticipates everything except for Margot's unusual behavior and Mark's analytical skills...
The film was ranked among the top ten detective films by the American Film Institute.