This third and final book in "The Bone Exchange" trilogy takes a roller-coaster ride into a dark world of debauchery, violence, and supernatural phenomena that tests the skills of Detective Slessa and Tom Isaacs to the limit. Armed with nothing but the copy of a fifteenth-century witness account of medieval torture and killing written by a long-dead scribe, Slessa finds several unnerving but accurate similarities to the case file. Risking everything they believe in and taking faith in both the ancient manuscript and the messenger, Slessa and Isaacs piece together the puzzle in an attempt to meet the New Order head on.