The world's worst nightmare has come true: Andrew Bennett, the only good vampire, has gone very, very bad! Now it's up to his lover Mary, Queen of Blood, to stop him but she is human now. She must embark on a quest to learn the truth about Andrew's past and which vampire turned him. But the problem is, it is the most deadly vampire alive: Cain! Collects issues #0, 13-18 of I, Vampire.