
Ambitious young cops try to prove themselves in their high-stakes careers, in which the smallest mistake can have deadly consequences. At the core of the close-knit group is perfectionist Andy McNally (Missy Peregrym), whose father was a homicide detective before he burned out on the job. The series follows Andy and her four colleagues -- Dov Epstein, Gail Peck, Traci Nash and Chris Diaz -- as they experience the trials, triumphs and tribulations of police work, as well as its effect on their personal lives.

With the senior officers off on another assignment, the rookies of 15 Division are on their own; a seemingly innocuous shift leads to a frenzied night in the station when an improperly searched prisoner pulls a gun on Chris in cells.

A prison transfer goes awry, and the convict flees custody; the officers of 15 Division are troubled to learn that it's Jon Grey, the pedophile they apprehended earlier in the year.

Nick and Andy go missing while working undercover to infiltrate a meth pipeline; Swarek and the other officers find themselves in the middle of a rescue operation; Andy works to deal with all the change going on around her.

On her first day back, Andy is forced to work a bank robbery case with newly promoted Swarek; a distraught woman gives Nick perspective on his life with Gail; a bombshell is dropped on Noelle.