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Charles Desvallées (Michel Bouquet), a successful insurance broker, employs a private investigator on suspicion that his wife, Hélène (Stéphane Audran), is cheating on him. After acquiring evidence of his wife's infidelity, Charles confronts and murders Hélène's lover, Victor Pégala (Maurice Ronet). When the police question the married couple about their connection to the murdered man, both Hélène and Charles continue their perilous dance of deception. Wikipedia