Chief Léo Mattéï is the leader of the police unit specializing in cases involving minors. Possessing deep empathy and a precise sense of justice, this ex-policeman of the BAC (Brigade Anti-Criminalité, a French police unit specialized in preventing and fighting crime) manages a team as competent as it is dedicated. He doesn't hesitate to disrupt established norms to defend the interests of minors, even against their own will.