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? 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.