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.

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.