A change of allegiance leads to the arrest of Andréas. Despite their orders, Caplan and Morlighem continue to investigate. They manage to dismantle a drug ring involving Russians and Turks. Roxane and Hélène have fallen into the hands of Vogel, who gives Caplan a grotesque choice: which one does he want him to kill? Who should he save? While the various Vor clans kill each other in Paris, the lives of Caplan, Morlighem and Roxane are about to take a dramatic new turn.