Surprise for this family returning from the West Indies. When they arrive, the parents' bed is occupied... by the corpse of a young man. No papers, no registered fingerprints, the "Invisibles" brigade is back. Darius and Ben follow the trail of a suspect in the clubs of Lille, while Duchess and Marijo understand that similar incidents took place in neighboring houses, squatted while the owners were on vacation. At the same time, Fabien, a man in his forties, seems to be hiding a heavy secret, and tries to face a mysterious blackmailer, who asks him for the impossible... Darius, on the other hand, crosses paths with one of the most important people of his past.