Freshly released, Lulu is awaited upon release from prison by her eldest son, Johnny, driving a stolen car. After having recovered Frédo, her other son, this woman of her word makes it her duty to keep hers: to lead Abdel and Sandra, the two offspring of her cell friend, to Poupoune and Riton. Here they are all on their way to the campsite where the couple lives. But in front of the sinister face of the tandem, Lulu changes his mind and takes the kids under her protective wing. Thus enlarged, the small family will now try to realize Lulu's dearest dream: to afford a boat. A few expedients were not enough, the troop launched into the meticulous organization of a hold-up.