The team reconstructs the lives and fates of a 75-year-old man dead in the middle of a rave party, bodies found in abandoned houses, and victims with no identity left in front of a hospital.

Following Operation Fontana, the team was dismissed, and everyone is now isolated. But when Chistera and Commander Risser, a newcomer to the Crime Squad, discover a small doll with traces of Darius's DNA on the corpse of an unidentified man, everything changes. Darius, under suspicion, is completely shaken. Why does this man, whom he has never seen, own this toy? Why does it bear his DNA? What does it all mean? As victims with increasingly atypical identities uncover new personal challenges, the Invisibles team faces new personal challenges that will bring them closer than ever. By piecing together the stories of these Invisibles, they stick together. They are a team. And when a case directly affects their team leader and his mysterious, painful past, Duchess, Ben, and Marijo prove valuable allies.

Following Operation Fontana, the team was disbanded. Ben trains the police officers in the station's gym, Duchesse handles the menial tasks of Chistera's team, Marijo faces retirement and tries to manage Léa, her granddaughter. Darius has withdrawn to his country house, far from everything and everyone. But when Chistera and Commander Risser, a newcomer to the Crime Squad, discover a small doll with traces of Darius's DNA on the body of an unidentified man, everything changes. Why does it bear his DNA? As victims with increasingly atypical identities are identified, the Invisibles team faces new personal challenges that will bring them closer than ever. As they piece together the stories of these Invisibles, they pull together. They are a team. And when a case directly affects their team leader and his mysterious, painful past, Duchess, Ben, and Marijo prove invaluable allies.