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New York : Chicken House/Scholastic Inc., 2009.
1st American ed.
vii, 481 p. ; 21 cm.
In an overpopulated world where all signs of nature have been obliterated and a wall has been erected to keep out plague-ridden animals, twelve-year-old Mika refuses to believe that his twin sister was killed after being abducted, and continues to search for her in spite of the dangers he faces in doing so.