As Chloe and Sam lie in the hospital between life and death, Andy and Dov get stuck in a diner when an armed robbery takes place. Gail chops her hair off and Andy confesses to Nick that she still loves Sam.

Clumsy new rookie Duncan gives his training officer, Andy, a run for her money while trying to solve his first homicide. Swarek's sister warns Andy against Sam and Oliver replaces outed Sergeant Frank Best.

Serving a warrant to confiscate items from an illicit gambler, Dov and Wes come face to face. Gail dumps Holly. Chris plans fight night; Duncan withdraws and Nick Collins takes his place. Chloe assists him.

Andy McNally risks her life when her rookie Duncan has a panic attack and simply turns off his radio instead of backing her up. Gail comes face to face with an orphaned little girl whose mother was gunned down in a laundry room.

The rookies undercover mission is aborted when Chris Diaz comes face to face with his personal drug dealer whom he arrests, botching up the mission. Chloe alerts Dov that his friend Chris might be in trouble but just how deep is he in?

Nick and Gail and Sam and Andy pair up to solve the case of Brian Gowdy's murder. The plot thickens with both a cheating wife and Sam's jailed father being more or less involved in the murder.

Investigating a firebombing in Little Italy, the rookies find a thumb in a trash bag. Andy faces off with Duncan at his hearing; Chris ditches work and Dov goes after him, forgetting Chloe's birthday.