Squad 19 is pulled into a big raid. Nick and Ben clash over a politically explosive DUI while Isabelle and Nick find common ground when Theo starts to act out.

A showdown between rival street gangs goes terribly wrong, leaving Ben’s life in danger. Squad 19 gathers at Marie’s for the Sergeant’s party and Isabelle discovers Nick may have feelings for someone else.

An amber alert ripples through 19. After realizing he’s been shutting Audrey out, Nick makes a strong commitment to her. Ben continues to date Amelie without telling Nick, adding another stress to their partnership.

After the arrest of a misunderstood homeless man and the retrieval of a runaway, Nick and Ben realize that not everyone can be saved.

The hunt for the mole takes a dramatic shift when Nick is pulled off patrol.

An accidental death leads violent protesters to occupy an abandoned building.

Ben returns home to Morin Heights when his father goes missing. Nick and Martine make a deal.

Guilt ridden Officer Nick Barron returns to work following a deadly shooting; Ben Chartier's transfer to Station 19 from Québec's rural police force turns rocky after a split-second decision triggers an internal investigation.

A wannabe mobster has a tempting proposition for Nick.

With the investigation of Elise Roberge over, Ben volunteers for surveillance duty. Ben and Audrey face the consequences of their accident. The squad ends up in the middle of a growing gang war.

Ben's actions bring repercussions. Ben and Nick seek justice for a raped prostitute and encounter someone they both never thought they'd see again. A new officer joins 19. The squad finds out something disturbing about one of their own.

Nick butts heads with J.M when they are assigned patrol together. Beatrice embarks on a new romance.

A cover-up comes back to haunt Nick and Ben, pitting them against Gendron. Nick’s frustrations mount when Ben encroaches on his personal life.

In the aftermath of the school shooting, the squad copes with the trauma as it affects them in ways they never expected.

After an accidental death, violent protesters occupy an abandoned building and the squad must clear them out.

The squad returns to normal duty. Nick keep secrets as he pursues his cousin's killer.

Tyler botches a takedown of a gang of rapists that nearly costs Nick his life, and leaves Ben to question Tyler's fitness on the job. Nick brings Harvey to Houle’s BBQ, which goes crudely awry.

In the climactic season finale, Nick receives devastating news, and struggles to contain his explosive response. A surprise visitor lands in Ben's life, forcing him to make some very hard decisions.

The squad becomes involved in a feud with firemen; little mistakes cause consequences.

Amelie takes a chance on Ben, while Nick and Isabelle receive shocking news about Theo.

With the mole on the run, a devastated squad turn on each other, and on themselves.

Nick investigates his cousin's death and finds a possible witness.

When he tries to help Nick with his investigation, Ben gets in trouble with homicide.

The city cuts public sector pensions, pitting the squad against their own.

Nick and Ben are set on taking down Inspector Elise Roberge in order to avenge the brutal murder of Nick's sister. Nick is first on the site of a horrific event with numerous casualties. Meanwhile, Ben and Audrey are implicated in a tragic accident.