Gregor Novara hunts evil.

Loathed by those who see him as an abomination for the incubus blood in his veins, he is regarded by others as a savior. Set loose to hunt down another incubus before the beast can put in motion an apocalyptic prophesy the Catholic Church has kept hidden for centuries, Novara must chase his prey through the years. He starts his mission with hope that gradually turns to despair, descending into darkness until he risks becoming the same evil he tracks.

Morgan Kelly is a New York City homicide detective with a growing list of murdered women. The mutilated victims are tied together by the manner of death and a bloodline extending back thousands of years. Fresh off a psych evaluation and a suspension, Kelly must find the serial killer while still dealing with the nightmares disrupting her life.

Father Roger Greene is the meeting point for Novara and Kelly. Assigned by the Vatican to be Novara's liaison, he is ordered to watch over the emotionally unstable emissary while also counseling his childhood friend, Kelly. Startled to discover the Church's evil and the serial killer are one in the same, Greene must put aside his fear and help Novara destroy the incubus before it captures Kelly and begins the cataclysm.