The precinct investigates Sergeant Houle’s suicide. Nick and Ben, who know the truth, decide how to proceed while the rest of the team grieves.

Ben is offered the role of acting sergeant. Bérangère and Val respond to a report of a strange object in an alley and make a horrifying discovery.

Nick and Ben’s explanation regarding the sex trafficking ring leaves Isabelle increasingly suspicious. Meanwhile, Houle’s daughter pays them a visit.

Tyler struggles during a difficult training activity. Isabelle turns up the pressure on Nick and Ben. Théo sees Sandrine in secret.

The failed operation sets the team back. With Tyler in training and Val absent, Bérangère tries to adapt to a new partner.

Nick continues to supply Audrey with illegal painkillers as she struggles with what happened to her. A journalist looks into Bérangère’s private life.

All officers respond to a major gas leak in a residential area that Nick knows well. Théo slowly starts to reconnect with his parents.

Devastated, Ben has only one goal in mind: finding those responsible for the explosion. Nick prepares to go after the elusive leader of the Tours Nord.

While Nick and Ben testify in the prostitution case, Gendron takes control of Station 19. The team organizes a Christmas party for the local children.

The precinct learns the truth about Houle and Ben’s secret investigation. Hunted from all sides, Nick pursues his personal justice at any cost.