Daniel leaves prison. He returns to Marseilles where Mathilda, his daughter, has just given birth. Nicolas, her spouse, a self-employed driver, is exhausted while Mathilda is a sales assistant on a trial basis. But, one night, Nicolas is assaulted by taxi drivers determined to reduce unfair competition.

Fired for insubordination, PJ Antoine Verlay, good cop but a blood strand and having difficulty working as a team, is attached to the OCBC (Central Office for the fight against Traffic in Cultural Goods) thanks to the intervention of the commander Pardo, his friend who becomes, therefore, his new superior. A clever investigator, but a stranger to everything related to culture, Antoine will have to work with Florence Chassagne, renowned art historian, who lives, speaks and breathes culture, to the point that - fruit of her great imagination - it happens to her in the midst of daydreams, to see and talk to the great artists who have disappeared as if they were familiar to her.

Lisa, a mother of two, is gradually being consumed by her alcoholism while her husband Vincent is busy with his career and underestimates the gravity of the situation, simply avoiding the subject.