I am on a task to read all of these YA dystopia books and this is my 4th one....I have to say so far it is my second favorite next to Hunger Games. The world is pretty well realized...though there were a few questions about about how it the society in the book became the way it was, but I assume this will be further explained in next books. But the Society is very sinister. Beware of people with good intentions has never been more true. Once you start laying down...its hard to ever get back up. The strength of the book is the building romance though. A lot of times...this seems rushed and pushed on me...but in this book it built slowly and made it all the more satisfying. Overall..I enjoyed it and look forward to the next book.