Mysterious and sinister and engaging.
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Six kids begin their tenure at a prestigious new prep school. Right away, strange things begin happening: they're gassed on the way to the school, parents don't remember them, other students act like pod people. They're tested, assaulted, and abused in order to achieve the ill-defined goals of the mysterious, unseen "headmaster".

The setup is effective. The school's designs are vicious and sinister right from day one. The students are functionally prisoners, scrambling to stay alive and figure out where they are, why they're there, what's planned for them, and how to escape it. The dialogue is sharp and the time- and location- jumps in the story are well organized.

My only real complaint is that it keeps piling up more and more mysteries and questions and weirdnesses without wrapping anything up. I'm not at all convinced that the author knows how it all will tie together (See the TV show "Lost").