This was definitely a case where I can't give it three stars, but it was certainly not a four. I'm not really sure why I liked it better than most of the YA I've read lately. I think that the idea of genetic mutations that manifest as 'skills' kind of appealed to me. I will admit that it felt like the relationship between them sprang up a little suddenly which is usually a no-no but here it seemed deeper, maybe because of their ability to read each other so well. The second half of the book was much better than the first and now I have to say that I'd like to know where Aria and Perry go from here on their quest to find the 'Still Blue'.