Thirteen-year-old Twig learns he was abandoned at birth and travels out of his Deepwoods home to find the place where he belongs.

Undertown is destroyed! Gnokgoblins, waifs and cloddertrogs huddle by the ruins, preparing for a mass exodus to a new home in the Free Glades. Rook Barkwater, a young librarian knight, knows the journey will be full of peril. Dangers are everywhere - vengeful shrykes, wild muglums and poisonous blow-holes, while in th Goblin Nations, the tribes are massing for war. Can Rook and his friend withstand the onslaught and preserve freedom in the Edgeworld?...

Quint finally begins his training at the Knights Academy, Maris adjusts to life in Undertown, and Sanctaphrax shivers in anticipation of a legendary storm, while a storm of a different kind brews between sky-scholars and earth-scholars.

In his continuing adventures, Twig, now sixteen years old, joins the crew of his father's sky pirate ship and embarks on a dangerous mission to collect the powerful stromphrax, a substance that purifies water and also prevents the city of Sanctaphrax from floating away.

Hedgehog, who hibernates through the winter, wants to know what winter feels like, so he asks his friend Rabbit to save him a little bit of winter to share in the spring.

Young pioneer, Micah, enters Wrymeweald full of hope to return home having made his fortune. But this is a land where wyrmes, fabulous dragon-like beasts, roam wild and reign supreme. After a near-brush with death on the edge of a canyon, Micah soon finds a chance to prove his worth when he meets with Eli, a veteran tracker of Wrymeweald.