1954年的伦敦，美国人雷纳被控谋杀富有的情妇藉以取得其巨额遗产。著名的刑案辩护律师韦菲爵士不顾健康问题接办此案。在法庭上，雷纳的妻子克莉丝汀竟然作了控方证人，指出雷纳的确杀了人。在最后关头，韦菲接获神秘妇人来电，表示她握有克莉丝汀写给情夫的信件。案情急转直下，雷纳被判无罪。然而，真相却更令人震惊。

  Tyrone Power, Marlene Dietrich and Charles Laughton star in this "brilliantly made courtroom drama" (Film Daily) that left audiences reeling from its surprise twists and shocking climax. Directed by Billy Wilder, scripted by Wilder and Harry Kurnitz, and based on Agatha Christie's hit London play, this splendid, six-time Oscar-nominated classic "crackles with emotional electricity" (The New York Times) and continues to keep movie lovers riveted until the final, mesmerizing frame.When a wealthy widow is found murdered, her married suitor, Leonard Vole (Power), is accused of the crime. Vole's only hope for acquittal is the
testimony of his wife (Dietrich)... but his airtight alibi shatters when she reveals some shocking secrets of her own!