Andy McNally’s (Missy Peregrym) first shift on the job turns into mayhem when shots are fired in a downtown rooming house. In the midst of the chaos, Andy triumphantly makes her first big arrest – a suspected drug dealer – who turns out to be Sam Swarek (Ben Bass), an undercover officer from her own division.

As the other rookies hunt down a dangerous escaped convict, Swarek (Ben Bass) drags Andy (Missy Peregrym) through his undercover haunts on a mission he won't explain.

While working on a high-stakes gun raid, Andy (Missy Peregrym) and Gail (Charlotte Sullivan) stumble upon a victim of domestic abuse (guest star Kristin Booth) whose brutal experience in the system has taught her not to trust the police.

A home invasion at an upscale address leads to a massive first response call that brings out the training officers in full force. After the scene is cleared, Andy and Traci remain behind with the terrified homeowner. When Traci is called away to deal with an emergency with her son, Andy is left alone to face the armed thief who is still prowling around the house.

Andy's undercover skills are tested – and found to be lacking – during a citywide campaign to clean up the streets, when she's tapped to pose as a prostitute in order to arrest unsuspecting johns. But the real test comes when Andy and Dov inadvertently put a vulnerable street informant's life in danger, and it's up to the two rookies to infiltrate a dangerous gun deal in order to save the trapped woman from a group of ruthless criminals.

Andy's romance with Det. Luke Callaghan gets complicated when he chooses her for a special assignment - serving a search warrant for a bullet lodged in the head of a witness to murder.