Following "The Two of Us", Claude is now 21 years old. Content with his life, he has a girlfriend Tania and he aspires to become an actor. When he receives his draft notice, a friend convinces Claude he can get out of military service with his connections in Paris. When the connections fall through, Claude is sent for basic training outside Paris before being shipped off to Algeria. His stops in Morocco and Algeria are uneventful as far as military action goes. He returns home with few bad memories of his army life ...

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?