Police commissioner Herville is found dead in a Chinese restaurant in the 13th arrondissement of Paris Gilou must break the news to Laure who is being treated in a Police rehabilitation center Now in charge of the unit Gilou begins investigating with Ali a young cop fresh out of training They quickly find themselves on the case of a breakin gone wrong and the trail of 15yearold Ryan a juvenile delinquent Roban learns he must soon retire but still manages to oversee the Herville case Awaiting trail Joséphine struggles with life in prison