A man who was injured in an accident has a visitor in his hospital. The visitor suggests a strange deal.

Jean Faran has the misfortune to run over with his car a young woman named Micaela. Once recovered from the fright, she invites him to her house to have a few drinks.

Marcel Farnoux, an industrialist, lives with eight women: his wife, his two daughters, his mother, his sister-in-law and two maids. One night, he is found dead, shot through the heart. Inspector Duret has a hard time unmasking the killer from among his eight suspicious wives.