In the highly anticipated sequel to Gregor the Overlander, Gregor is summoned back to the Underland by the terms of a second prophecy, this time about the Bane, an ominous white rat whose survival may come at the cost of Gregor's dearest treasurehis little sister, Boots. The Bane is destined to bring a World War to the Underland. But when Gregor comes face to face with the Bane, he finds he is unable to kill this creature. His heart tells him he's making the right decision. Will it be a decision he lives to regret?