Going into this book, I was suprised how the world of Safety ended up being portrayed. It added to the mystery of what's really going on and I enjoyed trying to put the pieces together with Korrine.
Watching her story progress was done really well.
This is a great standalone, but if it's made into a series I wouldn't complain. The ending gives you enough to be satisfied, but also gives you the chance to make some assumptions.
If you live scifi, young adult, 1st person POV, mystery; check this book out!