Albert and David Maysles’s documentary films are like no one else’s, combining intelligence, an incredible sensitivity for character and nuance, and a technical facility that creates a subtle and compelling mood. This 1968 study of door-to-door Bible salesmen in the Boston area and in the south is a superb and truthful look at an American institution—and at the troubling relationship between fact and fiction, materialism and spiritual values. Beautifully edited by Charlotte Zwerin, this film is required viewing for anyone concerned with documentary.