As a new Ice Age imperils the world, a lunatic fringe of the environmental movement has taken control of the U.S. government. Finding themselves abandoned by the new regime, the once-thriving space colonies must now replenish their air from scoopships that illegally dive into the atmosphere. But when Alex and Gordon"s ship is hit by a missile, they are sent tumbling to Earth--only to be hunted by authorities with ghastly plans for the two....