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There is no Next Episode of Engrenages planned.
Following the death of Sami, Captain Laure Berthaud is trying to cope as best she can. But her personal life, already a mess, threatens to be derailed further when she receives some unexpected news. Working with her trusted team, she leads an investigation into a shocking double murder.
Meanwhile, lawyer Josephine Karlsson tries to rebuild her reputation by taking on the case of a man accused of killing a policeman. It's a brilliant opportunity to get back in the ring, but things don't quite turn out as planned.
Laure's team manages to track down Stéphane Jaulin, whose lawyer turns out to be Pierre Clément. Clément takes to Jaulin's defence and clashes with Judge Roban, who sees his client as the perfect fit for the crime.
Meanwhile, the police investigation widens to include other possible suspects. Joséphine Karlsson succeeds in getting back on the case which had been stolen from under her nose. She forms an alliance with Roban, who is intent on exposing what appears to be a case of police manipulation. All the while, Laure is trying to deal with her 'problem'.
The double murder investigation steers Laure's team towards a group of bank raiders. Laure is not convinced of Jaulin's involvement, but Roban insists that the father has failed to tell the whole truth. In order to impress the commissioner, Herville entrusts Gilou with the job of breaking up a network of muggers. Experts called to testify in the case of the dead police officer show that the police manipulated the evidence.
Laure tries to convince Roban that he is mistaken in his pursuit of Jaulin and decides to concentrate on tracking down the raiders, but new evidence emerges which proves damning for Jaulin. Herville piles the pressure on his team to nail the mugging ring, so Gilou proposes an unorthodox alternative. While representing a civil case against corrupt police officers, Josephine Karlsson comes up against an infamous, amoral lawyer by the name of Eric Edelman.
Herville strives to endear himself to the police commissioner, who is eager to have a case resolved in order to whip up positive publicity, so Gilou steps in with a daring suggestion. But much is at stake, and Gilou's plan threatens to backfire. Laure's team hires an informant who was already on the payroll of Bremont's crime unit. Stephane Jaulin finds himself under increasing pressure as the number one suspect. In court, Joséphine goes head to head with the infamous Eric Edelman, who is defending the two policemen accused of manslaughter and corruption.
While pursuing the raiders, police come across new evidence which could potentially shift the focus of the double murder investigation. Pierre Clément presses an increasingly inflexible Judge Roban to free his client, as Stephane Jaulin sinks further into the depths of despair, with major consequences. Having been successfully represented by Joséphine in court, young Laetitia Ribeiro is acquitted and finally leaves prison to return to life on her estate. Determined to turn over a new leaf, she soon finds that her options are tragically limited and is roped into a criminal plan.
Devastated by Pierre's death, Josephine struggles to keep herself together. Laure is also affected, and the two women find some common ground in their shared grief. The police investigation into the double murder has uncovered a link between Sandrine Jaulin and Zacharie Gabbai's criminal gang. An operation is launched to catch Zach and his accomplice. Roban refuses to step down from the Jaulin case in the aftermath of Pierre's death, and resolves instead to bring in a promising young colleague, Carole Mendy.
The operation to capture Zacharie Gabbai has failed and he is now on the run. The police decide to set him a trap. Laure looks into the period in which Sandrine Jaulin's parents worked as a foster family, and a troubling history emerges. Carole Mendy requests Roban's help in a case of violent abuse involving a powerful Libyan businessman, Tarek Ziani. Gilou faces disciplinary action for the use of less-than-legal investigative methods.
Gilou is taken into custody, as his team looks on in dismay. Herville clashes with his superiors. The identity of Lucie Jaulin's biological father is finally established. Egged on by Edelman, Joséphine defends Tarek Ziani and engages in a power struggle with Roban. The police go ahead with their plan to catch Zacharie Gabbai, but the operation is a risky one - especially now that Gilou is out of action.
The investigation picks up when police find a fingerprint amongst Gabbai's belongings which links to the crime scene of the double murder. But who does the print belong to? Gilou is charged with conspiracy and, in an effort to get him off the hook, Laure goes out of her way to request help from the most unlikely of quarters. Nothing short of a bold move is required. Roban is determined to bring down Tarek Ziani and makes a deal with Ziani's lawyer Joséphine.
Following the savage attack on Kimberley, the noose tightens around the criminal activities of Karen's girl gang. But as the police start to close in, they strike again. Meanwhile, it's time to find out whether Josephine's audacity has paid off in her defence of Gilou. The Ziani case runs into trouble when it confronts the machinations of covert international 'diplomacy'.
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. But Gilou's dealings with a prominent police informant threaten the outcome of the operation. Laure's team pulls out all the stops to find the little girl kidnapped by Karen's gang, as a ransom is demanded in exchange for her freedom. Will the girl be saved? And will the culprit for the double murder of Sandrine and Lucie Jaulin be brought to justice?