Four friends discover the pleasures of Saint-Tropez.

Lydia, a model, and Helga, a flight attendant, live together and share the rent. Lydia gets a job in a cabaret, but the owner soon asks her to become a trainer, which she refuses. To punish her, he locks her up in his house. Thanks to her friend Helga, the police take a closer look at the manager's reprehensible actions.

Inspector Dubois investigates burglaries carried out by the Barbus gang. He tracks down the criminals and shoots some of them dead, before discovering that one of them is his brother.