 Pierre, 44, contentedly divorced, takes his teen daughter to the Côte d Azur along with his friend Jacques and Jacques  own teen daughter, Françoise. On the topless beaches of Saint-Tropez, Jacques and Pierre discuss marriage and being parents. Then, in a wild moment at a nighttime party, Françoise starts playing with Pierre, and one thing leads to another: they become lovers. After a couple of trysts, Pierre wants out, but Françoise declares her love for him and wants to tell her father about it. She does, but leaves out Pierre s name, so Jacques enlists Pierre s help in identifying who seduced his daughter. What will Pierre do?