The Trappers, hunter-gatherers who live beside a mammoth wall of ice, have none of the wonders their carefully hand-copied, ancient Warm Times books describe, like cars, guns, or plows. When bloodthirsty invaders slaughter most of the tribe, a small band of survivors heads south, led by a man few of them trust. Holding the remnants of her people together is their doctor, Catania Olsen, whose ugliness has left her unmarried but whose medical skill...