Very cool concept. It was one of those books that just hooks you in immediately. 

The only real issues with this is that you an tell it was written by a first time author. That's not saying it's badly written. You can tell that this was the authors first book, mainly by the language she uses. Again, not a bad thing. The main issues here is continuity. For example, in one scene two characters are talking at a counter, and then suddenly they're at a table leaning forward. This happens multiple times through the book, as well as some pages seem to be missing a paragraph or had a paragraph deleted and then the following one wasn't re-written. It doesn't ruin the story, but just makes it apparent that this is a book by a first time author.

That being said, I did already order the second book in the trilogy, and will be continuing reading this story.