On a trip to England, physicist Portia Harding is stalked by a heart-stoppingly handsome maniac. Theondre North is a nephilim—the son of a fallen angel—who needs Portia's help to change his fate. Problem is, Portia's down-to-earth attitude frustrates beings from both heavenly and hellish realms—and gets Theo turned into a vampire. But at least he has Portia to satisfy his newfound hungers-and possibly save his soul.