Guided by the fearless Dione-a red-haired native with a knack for flight and a language all her own-Wilt plunges into a realm where survival depends on mastering the strange currents of an alien ecology. Questions arise the more he bonds with Dione and her people. Who built this refuge? Why was it abandoned? And what does his mentor, the eccentric Dr. Sooma, know that he's not telling?
In a world of treetop villages, floating acorns, and lurking dangers, Wilt must uncover the truth of the Citadel-or risk becoming part of its forgotten history.