This book was good, but not great. There were times when I was really into this book, and the story held my interest; but mostly I was bored with the story, and I didn't mind putting the book down to finish the next day. I do want to make it clear though, Ms. Bracken knows how to write. Her writing is effortless and fantastic, which should make for a fantastic story, but unfortunately that was not the case here. 
 The beginning of the book was interesting. It drops the reader right in the middle of the action. However, this is also where one of the flaws comes in...there wasn't enough explanation. The back story is there, but we never actually hear the whole story. Maybe this is something for later books, but I think it was extremely important for this book. The "colors" that the children are was also confusing. I kind of figured out what each color (red, orange, yellow, green, and blue) meant, but there was never a solid description of what each color entailed. The colors were assigned based on ability, but those abilities were never fully explored. The other thing that really bothered me was the fact that there was zero explanation on why certain kids had these powers, while others died. I kept waiting and waiting for something, but nothing ever appeared to help me understand. 
 Then came the second part...for basically a good 200+ pages there was nothing. Honestly, it was so boring and unnecessary. Not much happened, and my interest hit an all time low. I was seriously considering skipping pages, but I thought, Maybe the next chapter will be better than this one. Unfortunately, I was proven wrong. I did like the characters that were introduced (Liam, Zu, and Chubs), but it wasn't enough to keep the story interesting. I also didn't like how quickly "love" blossomed between Liam and Ruby. It was like one minute they didn't know each other and were awkward, and the next was "I have always loved you." I was like, What the heck happened?! The other part of this section that really made me angry was that it was one big pity party for Ruby. Ruby kept complaining and whining about how unfair everything was, and it annoyed me to no end. I was waiting for her to pull out a violin so she could play it along with her mopiness. 
 Finally, it was the end of the book, and it was much better than the second part of the book. However, by this time I wasn't really invested in the story, so I didn't really care what happened. Nevertheless, the ending was still very good. Granted, the big twist of the story wasn't really that surprising. I figured it out pretty quickly, but everything went down in a very explosive finale. 
 I probably won't read the next one in the series because I think that might end up suffering from middle book syndrome, but maybe I'll change my mind. I think this is the type of book that readers will either absolutely love and think is amazing, or not like that much and feel it wasn't worth their time. I feel that a good 250 pages could have been cut out, and the story would have been a lot better. I was expecting a lot more from this book, so I felt a little let down. However, it wasn't a terrible book...it just wasn't the greatest.