A surprise for this family returning from the West Indies. Upon their arrival, the parents' bed is occupied... by the corpse of a young man. No papers, no fingerprints found, the "Invisibles" brigade is back. Darius and Ben track down a suspect in the clubs of Lille, while Duchesse and Marijo realize that similar incidents have taken place in neighboring houses, squatted while the owners were on vacation. Meanwhile, Fabien, a man in his forties, seems to be hiding a heavy secret, and tries to confront a mysterious blackmailer, who asks the impossible of him... Darius, for his part, crosses paths with one of the most important people from his past.
