A couple celebrates their son's birthday in the middle of the ocean on their boat . A violent storm hits and it brings up hungry creatures from the depths and they fight for their survival.

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 break-in gone wrong and the trail of 1...