Mason Rhyme is a fired former Philly cop now making ends meet with whatever hard luck cases come his way. As Christmas 1989 approaches, a ghost from Rhyme's past comes rapping at his barely standing office door: His former superior officer, Captain Silver. The case: Find a cop killer known as "The Horseman." As the body count rises, Rhyme has to keep his head while dealing with dirty cops and the ruins of his childhood. Can Rhyme stay one step ahead of a killer who strikes too close to home, or will "The Horseman's" cleaver bring Rhyme's one shot at redemption to a bloody end?