Following the deaths of Sgt. Matthew Boyden and an unidentified black man in a drive-by shooting, the gunman makes a speedy getaway leaving the team with no idea which man was the intended target. Meanwhile, his own drug addicted daughter, Amy, hears the news from a custody cell back at the nick. Still in shock, evidence collected from his daughter and colleagues lead the team to discover Boyden wasn't always on the right side of the law. Sure he may have had a few skeletons in his closet, but did anyone hold a killer grudge? The investigation takes a surprising turn when Sam is brought in for questioning – her underage daughter has been involved with Boyden and she is now a suspect in the enquiry.