A Parisian couple decides to sell an unsanitary basement in their building. A very ordinary, nondescript man, Mr. Fonzic, shows up to buy it. Nothing unusual there, until the man moves into the cellar and makes it his permanent residence. The couple tries desperately to cancel the sale but to no avail. Worse, Mr. Fonzic becomes a threat to their family as he befriends their teenage daughter on whom he seems to exert a perverted influence.
Mona, a prisoner on work release, meets Clément, a shy actor. Desperate to impress Mona, Clément recruits his extroverted friend, Abel, to help. When Mona becomes more interested in Abel, it sets off a conflict between the two friends. Meanwhile, Mona attempts to keep her past hidden.
Far’Hook is a 20-year-old rapper. Following a violent dispute with a rival, he’s forced to leave Paris for a while. His producer, Bilal, suggests that Far’Hook acts as driver for Bilal’s father, Serge, on a tour of French ports, following in the footsteps of the classic painter Joseph Vernet. Despite the age gap and culture clash, an unlikely friendship forms between this talented rapper and a bricklayer from the north of France during a road trip that concludes in Marseille for a final concert, one of reconciliation.