From the visionary author of The Genesis Quest, a "wildly imaginative" (Greg Bear) science fiction novel about a young man's struggle for survival on a comet made of ice. In Donald Moffitt's brilliant cosmic adventure, Torris, son of the Facemaker, knows only his small community at the base of the great Tree on a comet with almost no gravity or atmosphere. Torris's daily struggle for survival includes harvesting frozen air to...