 The ambitious police officer Cruchot is transferred to St. Tropez. He s struggling with persistent nude swimmers, but even more with his teenage daughter, who s trying to impress her rich friends by telling them her father was a millionaire and owned a yacht in the harbor. He gets drawn into it when he tries to cover for her when a friend  lends  the car of her assumed father. It turns out that the real owners of the yacht aren t exactly what they pretend to be either...