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 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.

Berthaud stakes out the Turkish restaurant that the Kurdish suicide victim was known to frequent and uncovers a work crew of illegal immigrants.

The autopsy of the Kurd reveals a hidden clue which leads Herville to upgrade the case to the highest priority. Special Branch try to blackmail Karlsson.

At a police meeting called when a youth is shot dead in a drive-by killing, Herville boasts that his unit will have arrests within 24 hours.

Berthault and her team are frustrated by new custody laws which ensure the presence of a lawyer during interviews.

When the police raid the Sarahoui's flat, Gilou takes the opportunity to break into their nightclub and retrieve incriminating evidence against him.

On learning of Cetin's release from police custody, the Ozbeks suspect him of informing against them and Rodi is ordered to eliminate him.

An online clue leads the team to the anarchists' squat, but during a raid Riffaut escapes. Judge Roban is given the results of his disciplinary hearing.

Kolabi is taken into custody, Karlsson attends court to defend victimised illegal immigrants and Roban attends a meeting with Prosecutor Machard.

The net draws in around Riffaut and his gang, but in-fighting within the police means that very dangerous loose ends remain on the streets of Paris.

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.

The torso has finally been identified: the victim was a policeman, a member of Bac Seine-Saint-Denis. On the spot, Gilou and Laure find the Commissioner Herville, their former superior. He informs them that a survey of the IGPN, investigated by Judge Roban, targeted the deceased's team. In another case, the mysterious death of Nicolas, the magistrate discovers that the young man and his roommate were paying off their charms. The trial of Thomas Weber, the son of a famous surgeon, begins.

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.

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.

The body of a teenager is found in the rubble of a building. Warned by Herville, Laure is convinced that there is a link with the investigation into the murder of Mercier and is trying to recover this case. In parallel, she continues her investigations to shed light on the rape of Josephine. Furthermore, the ex-wife of Fromentin is worried because she is unable to reach their son. The panic spreads to the policeman because Ruben does not answer his multiple calls either.

Jean-Etienne Vern asks for Josephine’s help because he is summoned for a conciliation commission: Stéphanie, a former partner, declares the breach of her contract and accuses her of harassment. At the police station, Enzo’s interrogation of Justine sets the police on the trail of Maria, the girl’s best friend. Laure and his colleagues are trying to find young Roma but she no longer comes to college.

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.

The surveillance of Calvi and Jolers confirms that they are in touch with the Camara brothers. Beckriche is asking for additional resources for his team and categorically refuses to allow the IGPN to resume the investigation on its own. For his part, Roban receives the results of his brain biopsy. Joséphine starts working alongside Edelman and is interested in the Bodin file. She is, indeed, intrigued by Roban’s findings, that she has been more meticulous in her work.

Cars burned, vandalized bus shelters: anger is brewing in the city after a police blunder. The population thinks the police have abused their authority and used violence inappropriately. Some take advantage of the confusion to stir up trouble in the streets. Chaos is not far off. The prefect makes the point with the commissioners Herville and Beckriche and prohibits any questioning so as not to cause more riots. The extremely tense situation causes the Calvi to panic, while Jolers keeps a cool head. He intends to take advantage of the situation of Drissa Camara, who is at bay.

Fabienne Mangin submits a modified plan to the City Council so that the land where the Roma camps were would be zoned as buildable. Having not obtained satisfaction, Drissa Camara is more threatening. For her part, Laure tries to find Maria and convince Herville to search for the vehicle of Calvi and Jolers. As for Josephine, she lets go of nothing and subpoenas Judge Roban and Attorney Machard to appear. Edelman fears such action will hurt his practice.

Drissa Camara is double-crossed, but hopes his hold over Gilou will save him. The secrets and lies become too much for Tintin. Josephine is in jeopardy if she sticks to her story.

A blunder by the depleted detective team has a shocking outcome, while what Moldovan also sells is revealed. Will Edelman's bluntness sway Josephine? Roban runs out of options.

Police Chief Herville is found dead in a Chinese restaurant in the 13th arrondissement of Paris. Gilou must break the news to Laure, who is being treated in a police rehabilitation centre. Now in charge of the unit, Gilou begins investigating with new recruit Ali, who is fresh out of training.

Meanwhile, Judge Roban returns to work from his time off sick only to find he is soon due to take compulsory retirement. And lawyer Joséphine struggles to adapt to life in prison while awaiting trial.

As the police identify that their top priority is to track down Ryan and his gang, Gilou agrees to work with Laure again, but she must find her place now that he and Ali are a team. Meanwhile, Edelman provides legal counsel to Joséphine to help her get out of prison.

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.

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.

Police work to uncover the role of Ryan's elder brother Fouad in the money-laundering scheme. Beckriche calls on his former colleagues at the fraud squad to assist in the investigation, but his decision is controversial. Laure and Gilou make a breakthrough arrest, while Edelman presses for a crime scene reconstruction he thinks will help Joséphine.

The money-laundering operation closes ranks. Beckriche orders his team to let the fraud squad take the lead with their investigation, but will his colleagues comply? Out of prison, Joséphine finds herself trying to pick up the pieces of her personal and professional life.

Following the debacle resulting in Fouad's death, the team is taken off the investigation. Laure is increasingly concerned about Lebrion's interference, while Joséphine realises she also has reasons not to trust Edelman.

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.

With his role in the investigation irreparably tarnished, Roban loses his grip on the case. Laure and Gilou go ever further out on a limb with a rogue decision to reactivate the now-dormant money-laundering operation. Joséphine, who now works for Solignac, continues to set traps.

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.

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.

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.