When a charred corpse is found in the boot of a car in the suburbs, Berthaud's police team are called to the scene along with the prosecutors Roban and Clement. So begins an investigation which forces the team into the broken, gang-ruled suburbs of Paris, and once more to the door of shady lawyer Josephine Karlsson.

Laure is disciplined for her use of force on a suspect and comes into conflict with Clement over his compromising newspaper interview. Karlsson is taken into Szabo's pay as his accomplice in representing the drug ring. Judge Roban uses his usual cunning in investigating a strange rape allegation.

The mysterious north African, Samy, arrives from Special Branch to help with the investigation into the Larbi crime family. Aziz is still out of control and finally pushes one of his young gang members too far - the team are called to a street shooting and the perpetrator is a sinister teenager.

The identity of the second body is revealed to be that of missing girl Celia Morau and the police begin to search for a serial killer, delving into the Paris underworld for clues. With little progress in catching the culprit, Judge Roban threatens to hand the case over to the Serious Crime Squad, but an important breakthrough occurs.

The police struggle to hold on to their suspect when he is hospitalised, while prostitutes who have been exploited by a criminal gang still believe the killer is at large. Judge Roban finds his head swayed by his heart as his personal life starts to have an impact on his work, while former public prosecutor Pierre Clement joins forces with an unscrupulous solicitor.

Laure's net is closing in on Aziz, but she still has to call in a favour from Roban to help her hold a suspect. A police stakeout on the estate goes dangerously wrong. Pierre is faced with a moral dilemma as his star begins to rise. Karlsson continues to play a dangerous game with Szabo's shady clients.

Rachid is dead, causing problems for both Karlsson and the police. Gilou has to investigate a murder linked to a gay nightclub.

Police captain Laure Berthaud seizes the opportunity to redeem her tarnished reputation when the mutilated body of a young woman is discovered, and immediately launches a search with her squad for the sadistic killer. Meanwhile, Judge Roban's investigation into the case of a child bitten by a dog turns out to have broader implications. French detective drama, starring Caroline Proust.

Laure struggles to keep her team under control when a second woman is reported missing. Meanwhile, public prosecutor Pierre Clement pays the price for refusing to cave in to pressure, and Judge Roban's investigation into possible corruption causes discomfort in high places.

Judge Roban transfers the case to the Crime Squad after an alarming number of procedural blunders occur, while the police are due to release the main suspect. Laure's reaction is surprising, but she remains determined to catch the killer, and Gilou finds himself in trouble.

Judge Roban asks CID to take charge of the investigation when new evidence comes to light and Laure is forced to take a back seat as Superintendent Bremor leads the case. Meanwhile, Pierre goes beyond the call of duty for his troubled client, and Judge Roban's pupil finds himself the target of a blackmailer.

Former public prosecutor Pierre Clement finds himself on the wrong side of the law and turns for help to the most unscrupulous lawyer he knows. Police tighten their surveillance on Niko's prostitution ring as the killer prepares to strike again, while Judge Roban discovers hard evidence to support his inquiry into municipal corruption.

Police strive to pinpoint the connection between the elusive leader of Niko's prostitution ring and the killer. Tension mounts between Laure and Gilou as he prepares to the leave the team and Judge Roban uncovers proof of Arnaud's betrayal and his reaction is unforgiving.

Samy goes deep undercover with the Larbi gang. The police are closing in on Aziz, but as usual nothing is straightforward. Josephine Karlsson is up to her neck in the dealings of the Larbi gang. Clement plays a clever game behind the scenes.

The police manage to remand their prime suspect in custody, but a series of revelations threatens to jeopardise the solidity of their case. Meanwhile, Judge Roban's uncharacteristically hasty actions look set to compromise his impartiality, and Pierre Clement finds himself roped into dealing with an unusual case.

Laure continues to protest that the serial killer is still at large, despite the evidence and opposition from her team. Meanwhile, Clement defends a young offender with a troubled past and Judge Roban ploughs on with his corruption inquiry - sparing no one in the process.

The police concentrate their efforts on putting Niko's prostitution ring under surveillance in the hope of tracking down a man who is an essential link in the investigation. Meanwhile, Bremont puts pressure on Gilou, prompting Laure to jeopardise everything to help him, and Roban suspects someone may have betrayed him.

Gilou is offered a way out of jail if he agrees to become a police informer, but on the condition that he keeps away from Laure. Meanwhile, the police team focus their investigation on the Paris neighbourhood of Barbès, where vulnerable delinquent minors are being exploited by receivers of stolen goods.

Laure tells Ali that Gilou has infiltrated Cisco's gang. To protect him, they'll need to play for time in their investigation - but their efforts are jeopardised when Judge Bourdeiou orders the arrest of Cisco's son Titi.

A public prosecutor is teamed with a hardened police captain and a magistrate to identify a body found discarded in a skip. As the case unfolds, their investigation uncovers deception and political intrigue.

As Samy's undercover operation nears its conclusion, the team prepares to arrest the Larbi brothers - but an unforeseen complication occurs and the detective's identity is called into question.

Laure's team tracks down Stephane Jaulin, whose lawyer turns out to be Pierre Clement. The investigation widens to include other possible suspects.

The operation to capture Zacharie Gabbai has failed and he is now on the run. Carole Mendy requests Roban's help in a case of violent abuse.

Roban can't stand to see Tarek Ziani elude his charges and tries to bring him down using the Crime Unit's investigation into a luxury vehicle racket.

With Gilou facing the possibility of prison, Laure's team try to recover their reputation by taking on a case that no-one else wants - the murder of an identified minor in a run-down part of town.