The Field of Blood by Paul Doherty
After the discovery of three savagely murdered bodies in his parish, Brother Athelstan finds himself involved in the hunt for a dangerous killer. It is clear that two of the victims, a whore and a preacher, surprised an assassin who was then forced to kill them. But who the third victim is, and why someone has gone to so much trouble to kill him, remains a mystery. And can it really have any connection with Sir John Cranston's attempt to save a women unjustly accused of stabbing a clerk?