Dan Weston is a simple, hard working family man. That quickly and violently changes when he is forced to watch the senseless murder of his wife and child at the hands of demons hiding in human form. As the man/demon responsible toys with Weston as if he were a simple pawn, Weston swears a vow of vengeance on all of the demon kind. With nothing left to lose, he immerses himself in the dangerous world of preternatural creatures.
On his quest to find some inner peace, Weston begrudgingly accepts help from the beautiful demon, Lucy. He finds comfort in conversations with an old war vet and Weston's longtime friend, Father Robert tries to right Weston's sinking ship of morality.
In a battle that seems to be stacked against Weston, he fights not only for the memory of his wife and child, but also to keep from losing his humanity and becoming a monster himself.