Gregor and the Code of Claw, Paperback/Suzanne Collins

Everyone in the Underland has been taking great pains to keep The Prophecy of Time from Gregor. Gregor knows it must say something awful but he never imagined just how awful: it calls for the warrior's death. Now, with an army of rats approaching, and his mum and sister still in Regalia, Gregor the warrior must gather up his courage...