Quick and engrossing read. Picked this one up because the premise sounded interesting, and it didn't disappoint on that front! Suffered from the classic YA problem of characters who discover a "twist" at the end that is super obvious the whole way through, but still very enjoyable. 
 2nd read: Sat down with this and finished in one sitting again! Still really enjoyable, and interesting to see the groundwork laid here for the rest of the series that is quite rare for a first book.