Everyone in the Underland has been taking great pains to keep The Prophecy of Time from Gregor. Now, with an army of rats approaching, and his mum and sister still in Regalia, Gregor the warrior must gather up his courage to help defend Regalia and get his family home safely.

When eleven-year-old Gregor falls through a grate in the laundry room of his apartment building, he hurtles into the dark Underland, where spiders, rats and giant cockroaches coexist uneasily with humans. This world is on the brink of war, and Gregor's arrival is no accident. Gregor has a vital role to play in the Underland's uncertain future.

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.

Follow Gregor in fourth gripping adventure in Suzanne Collins's masterful New York Times bestselling Underland Chronicles! Now, in the fourth book in Suzanne Collins's New York Times bestselling series, Gregor is drawn into a crisis. For generations, rats have run the mice--or "nibblers"--out of whatever lands they've claimed, keeping them on the move. But now the mice are disappearing, and the young queen Luxa is determined to find out why.When Gregor joins her on a fact-finding mission, the true fate of the mice is revealed. It is something far more sinister than Gregor or Luxa had imagined--and it points the way to the final prophecy he has yet to fulfill. Will Gregor's role as warrior be put to the test?

Gregor and Boots must return to the Underland to help ward off a plague. It is spreading fast, and when it claims one of Gregor's family, he begins to truly understand his role in the Prophecy of Blood. Gregor must summon all his power to end the biological warfare that threatens the fate of every warmblooded creature.

When Gregor and his little sister discover a strange underground city beneath their New York apartment, he becomes the unwilling participant in a conflict involving giant spiders, bats, cockroaches, rats, and humans.

When twelve-year-old Gregor finally learns the ancient prophecy, which foretells his death, he must gather his courage to defend Regalia from the army of rats, take his mother and sister home safely, and fight his own dark side.