Caplan and Morlighem head to Vogel's determined to avenge Theo who has ended up in hospital after the explosion. Vogel seeks a new accomplice. Roxane watches over Theo day and night.
When Caplan and Morlighem intercept a truck they uncover a major Russian prostitution ring. Roxanne strikes a deal.
After Vissarionovitch's death, Jordania and Pavlovitch both want to succeed his role as the leader of various Russian mafia clans. Roxane tracks down Vogel's sister. Caplan, Morlighem and Megrelishvelli believe something will happen at Vissiniarovitch's burial service and so stake it out. A contract killer named Odessa sets up a spot in the hotel opposite.
Jordania is placed under hospital suirvellance. Pavlovitch and Atom Parajdanov team up to try and get to Jordania in the hospital. Caplan offers a deal up, give up vital information on his rivals and he will be protected by the police. Vogel and Oriane take a hostage to pressure Caplan further.
The Pabvlovitch's organize the kidnapping of Salom and her son, in hopes that Jordania will come out into the open. Jordania realizes she has to accept Caplan's deal. Roxanne tracks down Vogel, but she can't bring herself to pull the trigger. They head for a safehouse, 30 miles outside of Paris.
When Oriane manages to work her way into Caplan's group as an interpreter, she seeks out her vengeance. Five years ago, the war stakeout between Rossi & Caplan's unit and Vibert's team, sees Vibert sent to prison after he shoots a suspect in cold blood.
Andreas finds himself under suspicion after a maximum-security safehouse is discovered by the Russians.
Following a change of allegiance, Andreas is arrested as Caplan and Morlighem continue their investigations despite being instructed to do otherwise. Roxane and Helene are captured by Vogel.