The aircraft carrier *Charles de Gaulle* has just set sail for a strategic mission in the Eastern Mediterranean, a region where the situation is volatile. Shortly after departure, however, a female crew member is found dead and another is reported missing. Despite the danger, the operation continues, and a military investigator is urgently dispatched on board. When a new victim is discovered, the *Charles*—a veritable floating city of 1,800 men and 240 women—turns into a trap where a killer, mounting tensions, and unfolding events threaten the crew and perhaps even the country itself.