Fallen angels were sent to kill Frank when he was a boy. He's been killing them ever since.
When a Watcher is gruesomely murdered, the Order suspects it's one of the Fallen and tasks Frank with apprehending the killer. But nothing could prepare Frank or the Order for what he finds during the investigation:
Someone has used stolen magic to free Arraziel, a fallen angel who feeds on the life force of humans. Frank needs to stop Arraziel and find the killer before more of the Fallen are freed.
If he fails, the human race may not survive.
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