After 15 years of marriage, American couple Nick and Audrey Spitz, a policeman and hairdresser, finally go on vacation to Europe. On the plane, the wife manages to meet an English aristocrat who invites her and her husband to spend time on her uncle’s yacht, a famous billionaire. The Spitz couple find themselves in high society surrounded by unprecedented luxury, when suddenly the elderly head of the family is killed under mysterious circumstances. Everyone present has motives, but the French detective decides that the main suspects are Americans, with a great lover of detectives Audrey sees this situation as the main adventure of her life.