The Maze Runner (set) By James Dashner

(The Maze Runner # 0,1,2,3)

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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