I thought this was a great ya sci-fi book. A thriller throughout, it was very hard for me to put down. I really liked Benson the main character, and many of the other characters. The premise of going to a boarding school but never being allowed to leave isn't totally believable, but I like it anyway. I loved the twist at the end when you find out that some of the students are robots, I had some idea of this but I wasn't totally sure. Variant isn't especially well-written but the suspense makes up for it. Great read for fans of ya sci-fi.