This second book has the action some of my students were asking about when they considered reading the first book. Now that the characters have ventured out of the society's picture perfect world they are facing violent attacks, starvation, thirst, the elements, and lots of fear. There is still not much sex going on - just kissing and Cassia and Ky disappear for a bit, but I did not feel it was implied very strongly that they slept together. It seemed more like they left to spend some time together and make out. Either way, everything happened off page. For mature students who handled the violence in the Hunger Games or Maze Runner, this is another book to encourage reading and discussion about totalitarian governments and the role of the individual in society.