DI Wesley Peterson is called to an unusual crime scene. The victim, Charles Marrick, has been murdered, his body drained of blood. Described by those who knew him as 'evil', it seems that Wesley isn't going to have any shortage of suspects. But 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 archaeologist friend Neil Watson is alarmed when he starts getting 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 is looking for. However, Wesley's investigation takes an unexpected twist when a third body is discovered many miles away.And Wesley has the additional problem of a skeleton found in nearby woodland, possibly that of a sex offender who disappeared twenty years before.Could there be a connection between all these deaths and Neil's letters?And could Neil himself be in danger?As the sinister truth unfolds, both Wesley and Neil are forced to face tragedy and shocking revelations...and a killer who bears the scars of past sins.