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.

The entire squad is embroiled in an intensely tragic school shooting with consequences that will profoundly impact all of their lives.

Nick and Ben will be forever changed by a tragedy caused by a misunderstanding.

Nick and Ben discover the truth behind Amelia's death.

Nick and Ben deal with the aftermath of a tragedy. Nick's lies threaten to drive them apart.

The squad waits for findings from a task force into Sergeant Houle’s case. Nick and Ben find themselves at the centre of the fractured squad, the only partnership that has endured. On the job, the squad face a horrific accident that puts multiple lives in danger.

The first of the month brings “Welfare Day” to 19 – Nick and Ben handle an array of belligerent civilians; the day caps off with a cataclysmic domestic disturbance.

The identity of the mole is revealed.

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.

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.

A wannabe mobster has a tempting proposition for Nick.

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.

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.

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

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.