Seventy years in the future, diseases ravage the human race threatening total destruction, and the crew of ship sent to investigate the biochemistry of Saturn's moons may hold the key to humankind's ultimate survival. By the author of Mission of Gravity. 20,000 first printing.

About the Author

Hal Clement is one of the world-famous names in SF in the twentieth century, the man who as much as anyone created the rules by which hard SF is written today. Clement (Harry C. Stubbs) lives in Milton, Massachusetts.

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