Police commissioner Herville is found dead in a Chinese restaurant in the 13th arrondissement of Paris.

Gilou agrees to work with Laure again. She must find her place now that Ali and Gilou are a team. The most important thing is finding young Ryan and his gang. Edelman does everything he can to get Joséphine out of prison.

Ryan is not telling the whole story, so Roban decides to lock him up. The notes from the break-in contain traces of cannabis and the cops link it to a drug dealer in a neighboring housing estate.

On the trail of a messenger transporting dirty drug money, Laure ends up in Aubervilliers, in a discount store warehouse zone.

The second DPJ tries to discover Fouad's role in the money laundering operation.

While the money-laundering operation closes ranks and the 2nd DPJ must hand the case over to the Financial Crime Brigade, the team circumvents procedure in order to identify David Cann, a financial advisor who is implicated.

Following the death of Fouad, the 2nd DPJ loses the case to the Criminal Brigade, headed up by Brémont.

Roban falls into a trap set by Joséphine and Edelman and carries out raids based on forged documents.

Blackmailed about the forged documents, Roban can no longer pursue his investigation. Laure and Gilou give him a swift and effective helping hand.

Laure and Gilou sink deeper into illegality by taking money offered by Solignac in order to pressure him, unaware that they are being followed by their former colleague, Tintin, now working for Internal Affairs.

Under investigation by Internal Affairs, Laure and Gilou find themselves in custody but are released due to lack of evidence.

Cann is on the run. In desperation, he asks Edelman for help, but Edelman has been arrested.