Rebus is back on the force, albeit with a demotion and a chip on his shoulder. He's investigating a car accident when news arrives that a case from 30 years ago is being reopened. Rebus's team from those days -- who called themselves "The Saints" -- is suspected of helping a murderer escape justice to further their own ends. And Malcolm Fox, in what will be his last case as an internal affairs cop, is tasked with finding out the truth.