Spies have reported the sighting of a Rat King in the Underland, a character who has been legendary since the Middle Ages. Recognizable by its tremendous size and snow-white coat, the Rat King is destined to bring a World War to the Underland.
In the second title in the Underland Chronicles series, Gregor and the Prophecy of Bane by Suzanne Collins, Gregor returns to the world beneath New York City, seeking his young sister, Boots, who has been kidnapped by giant cockroaches that are trying to protect her from murderous rats. PW said of Gregor the Overlander, "Collins does a grand job of world-building.... Unlike Gregor who cannot wait to leave, readers will likely find it to be a fantastically engaging place." .