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 keep breathing, dodging flutterbeasts, and hunting meatbeasts for food.

When the time comes to make his vision quest to the top of...