Maze Runner (Book 1) by James Dashner
Used trade paperback (cover may vary).
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When Thomas wakes up in the lift, the only thing he can remember is his name. He's surrounded by strangers--boys whose memories are also gone.
Outside the towering stone walls that surround them is a limitless, ever-changing maze. It's the only way out--and no one's ever made it through alive.
Then a girl arrives. The first girl ever. And the message she delivers is terrifying: Remember. Survive. Run.