A ballet producer returns to his native town and schemes to avenge himself on the family who tried to murder him 20 years before.
Hélène and Aldo Giovanni are a circus trapeze double act and a couple. Aldo is temporarily replaced by former-partner Alexandre when the former is injured. The two get into a fight and the following day Alexandre is discovered dead. Hélène suspects her husband is responsible for the murder.
Stuck in a loveless marriage, bourgeois industrialist Francois falls in love with Janine, another man's wife. Francois sets up Janine as his mistress, and she, mercenary soul that she is, likes the set-up so much that she continues the relationship even when her own husband returns from WW II. In the long run, however, Janine is the loser in the situation.
