Empyrion One In Search of Fierra Stephen Lawhead 1986
"What they saw, streaking through the atmosphere, was a turquoise world--blue-green with vegetation, water, and cloud-laced sky: a world never seen before. Here was a virginal world, rich and ripe, free and unspoiled. A perfect world--or so it seemed in those first dizzying moments of discovery. . . How could they know what lay ahead?"