[SCIENCE FICTION]. DE CAMP, L. Sprague (1907-2000). Lest Darkness Fall. New York: Henry Holt and Company, [1941]. 8vo. 379, [1, blank] pp. Publisher?s full black cloth, front board and spine stamped in white, publisher?s unclipped (?$2.50?) dust jacket (cloth lightly rubbed, endleaves toned; jacket toned and chipped, joints worn, a few marginal tears). A fine copy in a good jacket. FIRST EDITION. This classic in the alternate history genre, features the main character, Martin Padway, who travels back in time to Ancient Rome; he influences various events to prevent the Dark Ages.