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.

Now in prison, Gilou makes headway as an informer and gets close to Cisco, a dangerous convict coming to the end of his sentence, who is being monitored by the police. Josephine Karlsson meets Souleymane, the 13-year-old Moroccan boy accused of the murder Laure and Ali are investigating.

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.

The police investigation screeches to a sudden halt when Souleymane disappears. How and where will they find him? Meanwhile, Laure flouts the ban on seeing Gilou, who has got himself hired as a bouncer in Cisco's nightclub. There he meets the security manager, Cisco's son Titi.

Josephine has been blackmailed by the traffickers into defending their smuggler, Maria. Ali and Laure follow whatever leads they can tease out of the new line of enquiry, but how much information can they get out of their new arrest? And is there sufficient evidence to prove a link between the international smuggling operation and the murder case they are investigating? Captain Beckriche and Judge Lucie Bordieu must find common ground - and they do.

Laure and Ali identify 'The Alsatian' and get to work on a tracking device that was hidden under his car by members of a rival gang. Josephine tries to help Souleymane but her attempts are short of adequate.

Gilou is instrumental in helping Cisco's gang acquire a stash of weapons for the upcoming heist.Laure confronts him.Meanwhile, Edelman must learn how to best act in Lola's defence

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.

Joséphine heads back to Paris with young Youssef, but his brother Souleymane is now in grave danger. Judge Vargas, who was in charge of Gilou's infiltration, decides to cut his losses. But what does this mean for Gilou?

On the day of the hold-up, last minute changes cause chaos and the police's meticulously planned intervention is thrown into disarray. As the situation becomes more and more dangerous, Laure does all she can to get Gilou out to safety. But her options are limited - and very risky.

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.

The police make an appeal to the Press and get their hands on Elina's diary - which reveals she had friends in high places. Pierre discovers a connection between the murder victim and a childhood friend of his, now a wealthy businessman - and it seems they met the day before she died.

The police delve into the personal life of a businessman who burned to death in his own home, Clement struggles to conceal his friendship with a suspect in the Andrescu case, and Gilout's drug habit gets out of control. The mother of a murdered baby is accused of negligence.

A prominent ministerial adviser, who has links to prosecutor Pierre Clement's close friend Benoit Faye, joins the list of suspects for the ruthless killing of Elina Andrescu. Meanwhile, Captain Laure Berthaud comes up against lawyer Josephine Karlsson during an inquiry into a double murder.

DPJ group captain Laure Berthaud is responsible for investigating the case of a student blown apart by the bomb he was making. Soon he finds himself facing some far-left activists who advocate very radical urban guerrilla and direct targeting of police. Josephine Karlsson driven by her hatred of the police and government goes beyond her role as a lawyer and is trapped by the DCRI which monitors the far-left activists. Pierre Clément, who dreams of greater things, is wanted to defend Johnny Jorkal, a crime lord. Judge Roban, back to court after a long absence, finds he has been sidelined.

The inquiry into Elina Andrescu's murder takes yet another disturbing turn when the body of her missing sister Sophia is found in a freezer. A distraught Ghislaine Androux is brought to trial in connection with the murder of her baby, but Judge Roban soon begins to regret meddling in the affair.

Pierre Clement unwittingly endangers Benoit Faye's life when he resolves to have his friend arrested in connection with the Andrescu case. Lawyer Josephine Karlsson is called in to defend a young man accused of rape, while Gilout is compromised by blackmailers.

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.

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.

The Koné case takes a new turn with the destruction of a bank by a group of activists from the far-left. The lawyer Josephine Karlsson must come to the defense of Mary. but is retained by the team captain Laure Berthaud in the case of the student found dead, torn apart by a roadside bomb. Meanwhile, Josephine's associate, Pierre Clement, dreams of big business but having accepted crime lord Johnny Jorkal's request to defend him, he cannot help wondering why Jorkal has chosen him over someone more experienced. As for Gilou, he is approached by the nightclub owners who would like something done to resolve their problems with the authorities...

Berthaud and her team visit the scene of the immolation of a Kurdish detainee and spot Sophie Mazeret amongst the demonstrators outside the center.

Pierre begins divorce proceedings after his estranged wife is implicated in a drug trafficking scandal. Josephine defends a man accused of committing brutal acts of torture, while Gilout's drug addiction tests Berthaud's patience

With Benoit Faye in intensive care following an assassination attempt, the prosecution in the Andrescu case has lost its main witness. The events leading up to the sisters' double murder are reconstructed using Benoit's recollections.

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.