six and four.
If you have read hunger games, maximum ride, downsiders, uglies, pretties, and specials, or matched or the recent novel the fifth wave, you will like this book.
The one thing that surprised me about this book was that it reminded me of the sorting hat from harry potter, but the consequences are much more dire.
It is set in a dystopian Chicago, but it centers on the 5 downfall traits of humanity.
But by all means read it, it is a lovely exhilarating ride to read.
The characters, the romance, the different factions will grip you and never let go. Very action-ie as well.