An entrepreneur of social prestige gets intimate with the housekeeper, while his wife has a lover who is 20 years younger than her, whom she eventually loses to her nymphomaniac daughter.

Based on the French play Copain, Clopant. The plot revolves around the gangster Mallard, who wants to blackmail the rising singing star Tony. Tony and his friends, including Christine and her brother Zaza, join forces to hunt down the gangster.