Nick and Ben decide to take down Elise to avenge the brutal cuddle 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.

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; in pursuit of justice, Ben and Nick encounter a person they thought they'd never see again; a new officer joins 19; the squad finds out something disturbing about one of their own.

The squad escapes to a cottage for the weekend, where alcohol and the intimate setting lead to conflict.

The patrollers of 19 struggle to find their footing. Nick realizes what he wants. Dulac loses control.

Ben faces consequences; Nick's new romance gets complicated; Dulac crosses a line; Audrey thinks about the future.

Ben's troubles become public; Nick faces a crisis; Dulac gets in over his head.

The squad works during a full moon; Suarez and Beatrice receive unexpected news; the squad works to prevent a tragedy.