A CASE OF CONSCIENCE. London: Faber and Faber Limited, . Octavo, original green wrappers printed in black. Advance copy (uncorrected proof) of the first British edition. Proof has "First published in mcmlviii" instead of "First published in mcmlix" on copyright page. A novel expanded from a 1953 novella of the same title. "A Jesuit priest visits the 'unfallen' planet Lithia, where he solves a biological riddle and wrestles with his conscience. A thoughtful and entertaining work, with a range of intellectual reference unusual for the American SF of its day -- one of the masterpieces of 1950s SF, and Blish's best book." - Pringle, The Ultimate Guide to Science Fiction, second edition (1995), p. 59. "A rich, ambiguous, deep-cutting probe into the most ultimate of concerns." - Anatomy of Wonder (2004) II-136. The final part of the "After Such Knowledge" trilogy. Winner of the 1959 Hugo award for best novel. Pringle, Science Fiction: The 100 Best Novels 26. Survey of Science Fiction Literature I, pp. 303-07. Publisher's review slip laid in. Tiny nick in cover at bottom of front spine fold, a fine copy. Rare. Enclosed in a custom cloth clamshell box. (161011).