4.5 stars for this amazing book! 
 Nathan is the kind of attracting character that kept my attention from the first time I met him. His way of showing up on the most interesting times, a lot of them in disguise, makes him so mysterious I was dying to know more about him. 
 This book proved he's so worthy of my and every reader interest. This is an emotional, full of action and funny story. Nathan and Audrey are so perfect for each other and after 5 years of being separated, the passion is stronger than ever. Also, looking for a way of surviving the chips implanted on the Gray brothers spines and taking down the Commander, is full of danger. 
 This books made me cringe in fear, it made me laugh and cry... It's a fantastic book and I'm dying for the last one.