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The police finally close in on Niko's prostitution ring, but the killer evades custody leaving Laure in a race to get to him first. Judge Roban discovers that the moral high ground comes at a price, while Pierre finds Josephine has made a deal with Szabo to save him.

As police close in, Cann plans to make a run for it. But first, he reaches out to Edelman, asking for his help. Josephine intervenes in the investigation but is not immediately trusted. Meanwhile, Laure and Gilou still have not been cleared of wrongdoing by Internal Affairs.

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.

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.

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.

Four weeks after giving premature birth to Romy, still in an incubator at the hospital, Laure Berthaud is eager to resume service. The 2nd DPJ is called in the twentieth arrondissement where a human torso was discovered. Arnaud Beckriche, the new Commissioner, overseeing the investigation, leaves a week to his team to solve the case before transferring it to the criminal brigade. For her part, Josephine languishes in a firm specializing in business law when Eric Edelman comes to offer to defend the son of a famous cosmetic surgeon, accused of having ordered the murder of his father.

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.

Despite the strong objections of Beckriche, Laure, Gilou and Fromentin are convinced that they must stay on the trail of the Camara brothers. They discover that their homework is only a facade, behind which lies a traffic of contraband cigarettes. In the field, Gilou confesses the whole truth to Laure about the bullion. For his part, Tintin has to deal with the arrival of his son Ruben, who came to spend a few days with his father. In addition, Laure's investigation into Josephine's rape is progressing.

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.

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.

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.

Roban falls into a trap set by Joséphine and Edelman, whose professional partnership is now, however, on the rocks. Laure and Gilou continue to work on the investigation they've officially been taken off, identifying a suspect who may have been involved in the money-laundering operation. Beckriche's loyalty to his former boss is put to the test.

Ryan is not telling the whole story, so Roban decides to lock him up. The banknotes recovered from the robbery lead police to take their investigation to a nearby housing estate. Meanwhile, a link is uncovered between Wang and Herville, and Joséphine builds a rapport with her cellmate, Lola.

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...

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.

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.

The interrogation of the Camara brothers does not allow Laure to move forward, but Brémont informs him that his informer told him that Drissa and Bakary had taken part in a burglary, without the stolen gold being found. Josephine wakes up under a bridge, convinced she has been raped. She asks Laure for advice but categorically refuses to lodge a complaint, which could be detrimental to her career. Roban contacts Marianne because he wants to see her. At the trial, Rudy revisits his version of the facts and charges Thomas Weber.

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.

When Laure and Gilou, under investigation by Internal Affairs, are taken into custody, Tintin is torn between his loyalties to his former colleagues and his new job. Josephine also faces a moral decision about how best to fight Lola's case.

Laure follows the drug traffickers’ courier to a warehouse in Aubervilliers, where the investigation suddenly acquires a new dimension. Meanwhile, still frail, she struggles to cope with the responsibilities in her personal life. Joséphine has a hearing with the judge. And Roban pursues a case of negligence at a hospital by involving the hospital director.

The fiasco of the search of the Roma camp leads the police to resume the investigation of the Bac. Arnaud Beckriche asks Laure and his colleagues to focus their efforts on Jolers and Calvi to establish the extent of corruption. Herville has confirmation that one of his men has warned the mayor of the operation to make it fail. To appease her revenge, Josephine takes action. In addition, Romy’s health is improving.

Laure and Gilou sink deeper into taking illegal measures, risking yet more grave repercussions. Their former team member Tintin is tasked with investigating their methods. Meanwhile, Joséphine does her best to protect Lola. However, she proves to be a most uncooperative defendant - for reasons that Joséphine understands only too well.

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.

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.