Released after 8 years in prison, Adrien finds his family home. He discovers that his wife Teresa has moved in with Roger, and his children make the 400 blows and his former accomplices are not decided to give him his share of the booty.

Very calmly, Adrien Blaussac (Victor Lanoux) awaits his release from prison. He knows he is going to find his family and a nice nest egg that the police have sought in vain and that "friends" have kept for him. Adrien will quickly become disillusioned. His wife Teresa (Bernadette Lafont) lives with a bus driver (Pierre Mondy), his son, whom he believed to be a medical student, is just a petty thief; her daughter is not a beautician at all but spends crazy nights at the Palace between two gallant clients. And there is worse. He learns that his "friends" have no intention of returning the money that is due to him and that they are now in the pay of a certain Marval. Mad with anger, Adrien decides to take action. It is then that he realizes that his situation is even more desperate. Not content with not giving him back his share, his former colleagues decided, so that everything is clear, to remove him. Adrien, however, has a certain chance and comes out unscathed from the many machine guns he is subjected to. Never mind . Adrien, with the help of his son, decides to rob Marval's villa. However, the villa is particularly well protected with a very sophisticated alarm system and two mastiffs with sharp teeth. So much so that the two thieves have trouble leaving the scene and Roger has to fly to their aid with his bus. But Marval's safe was empty, Adrien must find an honest job and get hired on a construction site. As for Roger, who inconsiderately borrowed the equipment from RATP, he was fired.