Groundlessly jealous of his wife's romantic past, Enrico Fontana hires a private detective to finally determine whether she is faithful or not. Ironically, his suspicious attitude unconsciously brings his wife Paola (Lucia Bose) together with Guido (Massimo Girotti), a man with whom she had once been in love. Paola and Guido's past was clouded in tragedy. Guido had been involved with Paola's close female friend's death. Their passion rekindled once again, the lovers even get to the point where they are thinking about murdering Enrico....