4.75 stars. 
 I absolutely loved this book! It was such a great mystery/sci-fi/action book and it was so much fun to read! My favourite Altered boy would have to be either Cas or Sam. I think I'd have to go with Cas, though, because HE IS SO CUTE. Literally I'd love him to be a real thing. Mhm. The plot twists were absolutely surprising and page 250 left me in EFFING SHOCK LIKE WOT. 
 HOWEVER. *says however in Cat in the Hat voice* I think some of the details were a bit vague and leaving the reader to fill in the blanks instead of expressing what the author was actually trying to say, but other than that, AWESOME BOOK WITH HOT HUNKY GUYS. My two favourite things! 
 Loved it!