Under the Banner of Heaven

Season 1

1. When God Was Love

In 1984, in the fictional city of East Rockwell, Utah, LDS Detective Jeb Pyre and Paiute Detective Bill Taba investigate the brutal murder of Brenda Wright Lafferty, an LDS woman, and her baby daughter, Erica. Brenda's husband, Allen Lafferty, is arrested but claims men with beards committed the murders. He says he's no longer part of the LDS Church, which upsets the devout Pyre. Flashbacks show Brenda was the vivacious daughter of an Idaho bishop, and she met Allen while attending Brigham Young University. The Lafferty family is a highly respected and conservative LDS family.

Allen recalls that when his parents (Ammon and Doreen) were assigned a two-year-long mission, Ammon chose middle sons Dan and Robin to oversee the family and run his chiropractic business; he purposely snubbed his eldest son, Ron. Another set of flashbacks portrays Joseph Smith, the founder of Mormonism, having a religious revelation and proposing to Emma Hale. In the present, police arrest a bearded Robin Lafferty at a motel.

2. Rightful Place

Pyre questions Robin and Allen in separate rooms at the police station. Detective Taba investigates reports of gunfire, and is lured deep into the woods by a mysterious girl. Flashbacks to 1830s Kirtland, Ohio reveal the tense relations between the Church of Latter-Day Saints and other residents, resulting in the Mormons being forced to leave. Robin explains to Pyre that the family business ran into financial difficulties and they couldn't afford to pay federal taxes. As a result, Dan and Robin filed lawsuits and became tax protesters. Allen knew his brothers didn't like Brenda, as they considered her too independent for a woman. He feared for Brenda's safety, recalling how Ammon once killed the family dog to punish the boys for not doing chores. Taba finds a cabin in the woods and is confronted with a gun.

3. Surrender

Pyre and backup arrive to help Taba. They arrest Sam Lafferty and he speaks of a list consisting of sinners that need to be cleansed by blood atonement. The list includes several prominent LDS families, and police quickly search for them. Sam's daughter reveals to Pyre that tensions between the brothers and Ammon reached the point of violence when Ammon didn't approve of Dan's extreme views. Pyre consults his bishop about violent teachings in the LDS Church's past, and is told to not question it. Brenda tries to convince Dan to end his anti-tax stance but he refuses.

She then asks Allen to distance himself from his brothers, to which he agrees only if she puts off her career to have children. Allen says he now realizes he was putting Brenda in a cage. Robin discovers Brenda and his niece were murdered and tearfully insists he had nothing to do with it.

4. Church and State

Pyre, Taba, and Officer Morris investigate Bishop Low's empty house, which has been vandalized. Pyre discovers a letter that Dianna (Ron's wife) wrote, with Brenda's help, to LDS President Spencer W. Kimball, as she was concerned about the Lafferty brothers' extreme behavior. Bank employee LaConte Bascom reports that Ron was denied a loan to save his construction business because the church didn't approve of his brothers' libertarian anti-tax activism. Dan had visited a Fundamentalist LDS community and studied The Peace Maker, a document by Udney Hays Jacob that preaches polygamy as a man's holy right. He also convinced Ron to support his radical beliefs. Pyre connects the Lafferty family to Bishop Low's house invasion. Officer Morris locates Bishop Low, who was on a fishing trip.

5. One Mighty and Strong

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.

6. Revelation

Ron sought out a fundamentalist Mormon group that practiced polygamy. Their mother reveals to Pyre that there were two men named Chip and Ricky with her sons the night of Brenda's murder. The School of the Prophets encouraged a return to old and racist practices. Onias tells Ron he is their "One" chosen by God to receive God's revelations, which Ron believes. Brenda and Allen's marriage was on the rocks due to Allen's devotion to his extremist brothers. After he struck her, Brenda had asked the Church to grant her a divorce, but she was instead charged with saving the Lafferty clan from their ways.

When she attempted to do so, she was threatened by Dan and Matilda with blood atonement. Bishop Low and Brenda help Dianna and her children flee town for their safety, but Pyre worries Ron may have found and killed Dianna. Pyre breaks down as he confronts his now-wavering faith, reading the book Allen directed him to, Mormonism: Shadow or Reality?. Taba encounters Onias in the wilderness.

7. Blood Atonement

Onias tells Taba that the power of being the "One" corrupted Ron. Flashbacks address the Mountain Meadows Massacre of 1857 and conflicting accounts of what occurred. Pyre is asked to twist the law to save the LDS Church from bad publicity, but he refuses. Pyre's loss of faith causes a rift in his marriage. Allen tells Pyre that he and Brenda reconciled before her death. Jacob gives Dan's journal to the police, which Pyre uses to identify leads. Pyre and Taba go to Wyoming to interview Chip and Ricky, who recall Dan slashed Brenda and Erica's throats while Ron helped.

Taba confronts Pyre about blindly believing the LDS Church's version of history. In Miami, Florida, Dianna's children are taken to a safe house. Dianna returns to the Lafferty home, finds Matilda, and they flee Utah. Pyre and Taba locate Ron and Dan in the Circus Circus Casino in Reno, Nevada. The brothers are arrested just as Ron attempts to murder Dan in a bid to become the true "One." Pyre returns home and reconciles with his wife, no longer a believing man but seeing his family as his faith like Allen before him.