The rookies investigate a series of arson attacks, and Andy tries to stop a grieving widow from entering her burnt-out business, only to become trapped in the building.
Andy and Traci respond to a break-in at an upscale address. When the crisis appears to be over, Traci hurries away to handle a personal emergency, leaving Andy in the lurch when she is later confronted by an armed suspect.
The trainees face performance assessments that determine whether they can stay on the force, but Andy contemplates quitting following the murder of an unidentified girl at a house party.
While off-duty, Andy and Dov become involved in a holdup at a diner, Nick goes rogue to search for Sam Swarek's next of kin, and Andy is faced with both the men she cares for and must reveal her decision.
The investigation into the discovery of a missing man's body in the trunk of a car leads Andy and Sam to someone with a surprising connection to Sam.