Chief of Detectives Ben Gallagher thinks life will once again be rosy when his younger brother Andrew is released from prison. But, on the very day Andrew is set free, the brothers discover the body of a lifelong friend, and the murder launches Ben on a fast slide from his revered rule of law. He is soon ordered to stay away from the case, but the closer he gets, the surer he becomes that a family member is somehow implicated. Torn between loyalties, he embarks on a race that takes him thousands of miles and a couple of decades away, leading to a cold case in the north—and a killer no one would ever suspect.