On a beach in Nice, François meets the mysterious Peggy and falls in love with her. Following her to a villa, he meets Marc, a lawyer who has a strange relationship with the girl.
A young man comes back to his provincial home town to visit his dying uncle who is being attended to by a night nurse and novice nun. Before long, the young man develops a deep longing for the young, beautiful nun.
In the Nazi occupied city of Rome, an assault on an SS brigade draws retaliation from the military governship. "Massacre in Rome" is the true story of how this partisan attack led to the mass execution of Italian nationals under the orders of SS-Lieutenant Colonel Kappler.