Plot summary
Sam mentions a group called the School of the Prophets. Pyre and Taba learn from Bishop Low that Dan and Ron were excommunicated: Dan for wanting to take his two underage step-daughters as plural wives, and Ron for his controversial politics and for beating Dianna. The detectives question Bernard Brady, who was in the School of the Prophets with the Lafferty brothers and a man called Prophet Onias. Brady and Allen guide Pyre and Taba to the Lafferty farm, where they discover three women from a Canadian community alone, having been abandoned by Ron and Dan.
Pyre discovers Ron's list of people who they believe must face blood atonement. Brady reveals that Ammon died because Ron refused to provide him with medical care, citing Ammon's own beliefs and abuse toward the brothers in the past. Flashbacks to the 19th-century recount Emma Smith's rejection of polygamy, Joseph Smith's killing, and Brigham Young's rise to lead the LDS Church.
Credits
Adapted from Wikipedia contributors, Under the Banner of Heaven (miniseries). Series, exact episode number and English title matched. Paragraphs formatted; references and illustrations omitted.