First published 2012
When Gregor's little sister Boots falls mysteriously ill, he has no choice but to venture back into the strange, subterranean world of the Underland. There, he discovers a deadly new plague sweeping through the lands, threatening the lives of his friends and loved ones. Gregor must lead a perilous quest to find the cure, facing unknown dangers and his own darkest fears along the way. In the Underland's treacherous depths, Gregor will be forced to make the most difficult decisions of his life to protect those he holds dear.
Genres: fiction, adventure, fantasy, young-adult
Vibes: emotional, fast-paced, suspenseful
Tropes: found-family, quest
Setting: New York (N.Y.), Regaulia
358 pages · Paperback · Scholastic Paperbacks