A young man returns from Rome to his sister's satanic New York apartment house.
Vincenzo, a 30 years old apathetic and lazy man who still lives with his mother, has no job and no desire to improve. He meets Anna and fell in love with her but to keep the relationship alive he has to learn to accept more responsibility.
In the 1860's, Giorgio (Giraudeau), a young Italian soldier is sent to a remote post, far away from his lover, Clara (Antonelli). He is lodged in the house of the colonel (Girotti). He becames friends with the colonel and the local doctor (Trintignant). Among the inhabitants of the house, there is a strange young woman - Fosca (d'Obici) who is both unattractive and mad. However, she has a passion that Giorgio will have to cope with.
