How do you survive in a world where if you open your eyes what you see drives you to madness, suicide, even murder? This was a page turner and I really enjoyed the reading; however, it left me unsatisfied because I wanted to know more about what is it that they see exactly. I felt there were plotholes that bothered me. Nevertheless, I liked the ending. Overall, a quick read and enjoyable thriller for a light reading despite its dark subject matter. I had watched the movie years ago, and I want to watch it again now that I have read the book also.