The antagonist is Patch. He is a fallen angel that is attempting to become human so he can live a free life without the agenda and rules of the other angels. To become a human he has to kill the leader of the Nephilim Chauncey. It is impossible to kill him unless you kill a female descendant of his who happens to be Nora, the protagonist. Patch cant kill her though because he is in love with her. He must choose between becoming a human and sacrificing his true love or live as a fallen angel and try to find a new way to become human. Either choice will not lead to his immediate happiness.