Mathilde Ceccarelli

Marceau Léonetti, a competent and energetic officer stops by chance the son of an influential lawyer driving under the influence of alcohol. A few months later, the lawyer falsely accuses Léonetti as being violent and incompetent. As a result Marceau is transferred to a small police station, where he meets young and beautiful Jeanne. Soon they are faced with a tough investigation.

A lovely summer day in Paris. Roger and Martine are on their way to work. "Work" is a euphemism because Martine is a prostitute in Pigalle. She is saving money to buy the house of her dreams in the country. Her husband Roger "works" for the same goal, but in a brothel for women. There, duchesses rub elbows with businesswomen, militant members of women's lib and other female pleasure-seekers.

Charles Van Horn, son of rich and powerful Théo Van Horn, calls upon his former teacher Paul Régis to help him solve the mystery of his recurring bouts of amnesia.