A string of grizzly murders and ominous epistles present a perplexing case in this unique blend of history and mystery At the scene of an unusual crime, DI Wesley Petersen finds the body Charles Marrick, who has been murdered and his body drained of blood. When a popular local vet is murdered in an identical fashion, Wesley wonders what the two men could possibly have in common. Meanwhile Wesley's friend Neil Watson is alarmed when he begins receiving disturbing anonymous letters writing in gory detail about macabre events at a medieval abbey; Neil fears that his letters are being sent by the killer. Wesley's investigation takes an unexpected twist when both a third body and a skeleton are found, the latter possibly belonging to a sex offender who disappeared 20 years before. As the sinister truth behind the mystery unfolds, both Wesley and Neil are forced to face tragedy, shocking revelations, and a killer who bears the scars of past sins.