It begins with a number of werewolves found dead, their blood drained. For Riley Averline, a Centurion with the Order, the immediate suspect is a vampire. When the three vampire covens of Boston proclaim their innocence, however, it forces Riley to look deeper. Into the case, and into himself. Enter the world of the Order of Cerberus, one filled with magic and the supernatural, but also the very human concepts of loss, grief, and what we are willing to do in order to heal from tragedy.