Their old world's in chaos. Their new world's in danger. And they don't trust each other. Opis is now home to a reluctant band of evacuees in mankind's most distant and secret outpost, Nomad Base. There's no going back to an Earth brought to its knees by bioterrorism. But Nomad's colonists are torn. Do they offer their old world a lifeline by sharing a groundbreaking alien drive technology, creating an exodus that'll...