Ben faces rising consequences from his actions on surveillance; Nick's new romance gets complicated and forces him to face his own past; Dulac crosses a line; and Audrey starts thinking about the future.
In the aftermath of tragedy, the patrollers of 19 struggle to find their footing. Ben tries his best to keep the moral clarity he found at the cottage; Nick realizes what he wants in his life; and Dulac loses control on the job.
The squad escapes to a cottage for a weekend getaway, but too much drinking and close quarters have a detrimental effect. Meanwhile, Nick's concern for Ben increases after his partner gets a troublesome call from Internal Affairs; and Ben makes a bold decision that could put his career at risk.
Ben's rash actions on surveillance have consequences. Meanwhile, Ben and Nick seek justice for a prostitute who was raped, and encounter someone they thought they'd seen the last of; and a new female officer joins the 19.
With the investigation of Elise Roberge over, Nick and Ben struggle to move on with their lives. His faith in justice shaken, Ben volunteers for overtime-surveillance duty, while Nick looks for tether outside the job. Ben and Audrey deal with the consequences of the tragic car accident they were involved in. The squad finds themselves pulled into a burgeoning gang war.
Nick and Ben try to avenge the brutal murder of Nick's sister. Also, Nick is first on the site of a horrific event with numerous casualties, plus Ben and Audrey get swept up in a tragic accident. The Season 4 opener.