Rich industrialist Jacques Decret learns his wife Gloria is having an affair with a young actor. For revenge, he bombards her with anonymous letters, convincing her that her lover is the culprit while Gloria desperately seeks a way out.

• Société Nouvelle des Établissements Gaumont (SNEG)
• Gérard Oury
• Jeanne Moreau
• Philippe Nicaud
• Jean Lefebvre
• Micheline Luccioni
• Claire Maurier
• Jean Michaud
• Albert Michel