
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.

A silent alarm leads Andy and Swarek to the discovery of an illegal warehouse party and to an injured John Doe; a homeless squatter who has been the victim of a brutal stabbing; 15 division works to contain the teenagers to the scene for questioning.

Nick and Oliver embarrass 15 Division when they're surprised by a pair of gunmen and end up losing the key witness in an upcoming mob trial; with no leads, all hope seems lost for the police until a man comes in off the street with vital information.

A grad student goes missing, Andy and Nick's search reveals the young woman was leading a double life as a high-end escort; the police discover that another escort also went missing a month ago, a pattern begins to emerge.

The same night the officers of 15 Division are forced to release a suspected predator for lack of evidence, Andy and Gail are violently assaulted in Andy's loft and Gail is abducted; Detective Luke Callaghan is brought in to oversee the case.