There really is not much to dislike about this book. It has everything you are looking for in a YA novel, with terrific pacing and a bit of humor tossed into the mix. Allira and her brother Shilah are both defective, which means they have a gene giving them mutant powers (think X-men). 
 What Howarth does so well with this work. While she is writing about a world where people are able to have fantastic (and not so fantastic) super powers she still makes it about the characters themselves and not the flash. While the defectives are a more evolved human they are still preyed upon by the government, which creates an interesting landscape; while they may be more enhanced than they predators, the defectives are still vulnerable. 
 Without giving anything away, my favorite characters are Tate, Ebbodine, and Paxton. I hope to see them more in the rest of the series. 
 If you like YA this book is everything you are looking for. I look forward to completing the whole series.