Paperback
Published Aug. 30, 2007 by Alfaguara.
Gregor De Las Tierras Altas (Cronicas De Las Tierras Bajas I)
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When eleven-year-old Gregor and his two-year-old sister are pulled into a strange underground world, they trigger an epic battle involving men, bats, rats, cockroaches, and spiders while on a quest foretold by ancient prophecy.