The maze runner

Thomas wakes up in an elevator, remembering nothing but his own name. He emerges into a world of about 60 teen boys who have learned to survive in a completely enclosed environment, subsisting on their own agriculture and supplies from below. A new boy arrives every 30 days. The original group has been in "the glade" for two years, trying to find a way to escape through a maze that surrounds their living space. They have begun to give up hope when a comatose girl arrives with a strange note, and their world begins to change.