Odessa Berken, Chief Warrant Officer of the Navy, investigates a disturbing disappearance at the naval base of Brest. Frédéric Le Gall, chief of a marine unit, announces a suspicious absentee, Yassin Rhaled, 23 years old. The following day, Yassin's body is fished out of the ocean. The autopsy conducted by Samuel Delaunay leaves no doubt: the young man was murdered. The first s...