When she was a young girl, Narcissa loved nothing better than to read heroic tales about brave men and women risking their lives to bring Christian ideas to "barbarians" in far-off places. In 1831, her dream of doing the same was about to come true. That's when some Indians arrived in St. Louis, Missouri, looking for the "White Man's Book of Heaven." Their quest was the answer to Narcissa's prayers: She would bring salvation to "those wandering sons...