Groundlessly jealous of his wife's romantic past, Eric Fontana hires a private detective to finally determined whether she is faithful or not. Ironically, his suspicious attitude unconsciously brings his wife Palo together with Guido, a man 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...After making highly regarded documentaries, Story of a Love Affair was Michelangelo Antonioni's first feature length dramatic film. It is also signalled a significant change in the direction of post-war neo-realism.