In a moment of madness a respectable pharmacist kills a young woman who is sun-bathing by a lake. Unable to take in what he has done, he flees from the scene of the crime and behaves as if nothing has happened.
In the 1860s, 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.
