On July 6, 1947, rancher Mack Brazel walked into the sheriffs office in Rosewell, New Mexico, to report some strange debris in one of his fields. The incident was the culmination of several reports of strange lights, sounds, and shapes in the sky; the beginning of a series of government statements, retractions, and denials; and the subject of a thousand conflicting stories. What actually happened at Rosewell-and how the government reacted to the case-has...