In 1921, the Church of Jesus Christ of Latter-day Saints excommunicated Joseph White Musser for his refusal to give up plural marriage. Cristina M. Rosetti tells the story of how a Church leader followed his beliefs into exile and applied the religious thought he began to develop in the mainline faith to become a foundational theologian of Mormon fundamentalism. Musser's devotion to Joseph Smith's vision and the faith's foundational texts reflected...