《谋杀计划》是由约瑟夫·科顿,简·皮特斯,加里·梅里尔,凯萨琳·麦克劳德主演的一部恐怖片，Whitney Cameronn (Cotten), a man with a strong affection for his sister-in-law (Peters). When one of her stepchildren dies, it's revealed that the child was poisoned to death. Whitney suspects his sister-in-law committed the murder and is afraid that her other son may be in danger. The film climaxes during an ocean voyage aboard a cruise ship.