“Sigismond” (Joe Dallessandro) enjoys a lively marriage with his wife “Sergine” (Mireille Audibert), and he's devoted to their young son. However, a business trip to Paris leads him to receive a letter, after which he begins an extravagant affair with call-girl “Diana” (Sylvia Kristel), developing a growing fixation on her. Her pimp isn’t happy about this new arrangement and responds with some rather forceful attempt…