When Austin Archer was eighteen, he was attacked by an unknown assailant and rescued by a dark figure who wore ebony armor. Now thirty and a police detective, Austin faces a mystery that is connected to his own attack in ways he never thought possible.
Someone is murdering teenagers in Austin's city. At first Austin suspects a mysterious man named Jude, but Jude is far more than he appears to be, and knows more about Austin than a stranger should. Austin is drawn to Jude and wants to trust him, but Jude's claims about the identity of the murderer and even his own are too fantastic to be believed.
When Austin was a child, his mother sang to him that angels were watching over him. Austin is about to learn that this is more than a lullaby.