
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.

Andy and Traci are among the first responders to a home invasion at an upscale address; when the crisis appears to be over, Traci hurries away to handle a personal emergency; Andy must confront the armed suspect alone.

A fatal traffic collision reveals a shocking truth; Andy and Callaghan's relationship gets complicated when they disagree over the handling of a witness in a murder case.

A heat wave makes life on the streets even more perilous for the rookies; the squad discovers that a serial rapist may be on the loose; during a blackout, Andy must take down a vicious predator alone.

Chris and Andy face a tough decision while investigating a vicious beating; Sam and Luke get competitive during a retraining exercise.