While watching a bullfight, Simona (Laura Antonelli) relives a traumatic experience she had when she was younger. Simona and her lover Georges (Maurizio Degli Esposti) had a free and joyful sexual relationship, and used to meet on the beach. One day they spot a girl spying on them; she is the young Marquise Marcelle de Paille (Margot Saint'Ange), who lives almost buried alive in her father's house. Since the premature death of Marcelle's mother, her father has developed an ambiguous and obsessive attachment to his daughter and will do everything to keep Marcelle near him. Simona and Georges decide to free Marcelle from her captivity with tragic consequences.
One of the first movies with Italian sex symbol Laura Antonelli in the main role, Passion was originally banned by Italian censorship and it was released some years after its completion.