Over this long hot summer, Claude and Isabelle get their marriage back on track, while Bibou and Simon, spend a memorable summer discovering the world of grown-ups.

Thomas Gardesse, a traveling alarm systems salesman, is arrested for a minor offense and sentenced to six months imprisonment. To win the respect of his fellow inmates, he claims he is "The Marquis," a brilliant robber whose identity has remained a mystery. Two weeks before his release, an armed robber named Quentin Tasseau helps him escape and takes him to Manila so he can take part in a robbery whose mastermind requires the talents of the Marquis.

Michel dreams of a perfect meeting with the woman of his dreams, entirely due to chance, as his parents and grandparents experienced. Vincent, Michel's contrast, is completely different. He is more the man of the direct approach and he follows his...! The two childhood friends Michel and Vincent, with completely opposite views when it comes to women, soon discover the limits of their respective techniques when they meet Angèle and Nathalie.