New York: Macmillan, 1979.
Hardcover. Fine in a near fine dust jacket. Third printing of the American edition. 382 pp. A fine copy in a price-clipped jacket with light shelfwear. The final book in Lewis' theological science fiction trilogy, described on the jacket as "a parable on much the same theme as Aldous Huxley's Brave New World: the degeneration of man that inevitably results from a gross and slavish scientific materialism devoid of all idealistic, ethical, or religious values."