Even as a hardened cop, things have never been tougher for Detective Vic Mackey. In this season, he must deal with a vicious, gang-related slaughter with no leads, the desperate attempts of an Internal Affairs detective to discredit him, and the looming threat of forced retirement. To top it all, he's obsessed with finding the killer of a valued Strike Team member and friend. Meanwhile, Shane hooks up with the Armenian mob and becomes a dangerous...

The story of an inner-city Los Angeles police precinct where some of the cops aren't above breaking the rules or working against their associates to both keep the streets safe and their self-interests intact.

Charlie Crews is an eccentric detective returning to the force after being wrongfully imprisoned. Back on the beat with his determined partner, Dani Reese, and his unusually Zen-like outlook toward the cases he investigates, this unconventional crime solver tries to catch the LA wrongdoers who really belong behind bars.