Struggling to find his feet back in Ireland after a lengthy posting with Europol in Spain, drugs specialist Mike Mulcahy is plunged into unfamiliar territory when the daughter of a politician suffers a horrific sex attack. Dragged into the case against his will, Mulcahy becomes convinced there is more to it than a random frenzied sexual assault, especially when he discovers that the weapon used by the attacker to torture the victim was a crucifix. But know-it-all colleagues and politically motivated bosses, eager for a quick, uncontroversial result, ignore his belief that the attack had religious rather than sexual motivations. Sidelined and overruled, Mulcahy sets about his own investigation, but frustrations abound at every turn-until reporter Siobhan Fallon turns up asking awkward questions. As more young women are attacked and assault turns to murder, Mulcahy and Fallon are drawn into an uneasy alliance, and each step they take hurtles them ever closer to the monstrous killer known only as The Priest and a final showdown that is as explosive as it is unforgettable.