***SPOILER ALERT!*** 
 Off to find the his brother, he leaves his old life. Leaving High School and the girl he loves behind him, he is on the mission on rescuing his little brother from the hands of Verchiel -and evil angel who believes he is doing the word of God- who is actually an asshole in discovery channel. Being a Nephilim hasn't been easy for Aaron, but he isn't like any other half-human half-angel, he has a mission and it is to free all of the Fallen Angels and help them return to Heaven or Paradise. 
 What he doesn't know, is that the girl he's in love with is also a Nephilim, who falls in the evil hands of Verchiel. As soon as he goes to rescue her, he discovers that his little brother isn't little anymore, but a grown man who is tagged as a hunter. He kills, and keeps trophies of his victims. 
 Camael, who used to me the right hand of Verchiel, helps train Aaron to accept his nature. He reminds him every day of his mission and why he has to complete. He grows fund of Aaron in a secretly way. It's a shame he had to die, he grew on me. :) 
 Having to kill his brother, and destroying Verchiel, he is finally able to release all of the fallen angels from Aerie, and train all of the other Nephilims who are left behind. Well, it's a great book. Dark, religious, and funny. Why funny? well if you had a labrador who can speak 24/7 and only you understand what he is saying, well it's pretty funny. Have you ever heard a dog call SHOTGUN!? well you will. :)