The Host: Shadows

Sometimes the things that go bump in the night are there to protect the innocent. Four hundred years ao, Tristain St. Blaise worked as an apprentice for alchemist Beniot Achilles. An experiment went terribly wrong, fusing an entity to Tristain's soul, turning him from an enlightened man of reason to one of dark passions. Now, to find some measure of redemption, he wears the mantle of a hired killer, protecting innocents and ridding the world of men like Achilles.
Angelia Lightheart has worked hard to purge her life of unhealthy relationships. One night in a dark Manhattan alley, she is saved from a would-be rapist by a man who seems to look through her very soul into the weary heart she hides from the world. As Angelia and Tristain fall in love, his work as a contract killer brings him face to face with the one responsible for his immortal state--endangering not only their love, but Angelia's life.