Set in 2010–2012 in and around the fictional town of Belleton, Georgia, the novel is narrated by Scharisse "Schar" Freeman, the wife of Rev. David Freeman, pastor of Hope in Christ Baptist Church, one of the largest Black megachurches in America. Within Black church culture, a pastor's wife holds the title of "First Lady," a position carrying both social prestige and enormous pressure to perform piety. Schar married David at twenty-two and has spent eighteen years seeking acceptance from the exclusive sorority of megachurch pastors' wives, women who have always looked down on her for lacking a churchgoing family lineage and for not knowing who her father was.
The novel opens on Pageant Night, November 20, 2011, with Schar backstage at the 51st Annual First Lady USA pageant, a by-invitation-only competition for pastors' wives. She has been banished to a janitor's closet after ten of the eleven other contestants voted to expel her for an alleged affair with Rev. Jeddah Lancaster III, Belleton's first Black mayor. Though the pageant's young co-directors, twins Nate and Nikki Bailey, refused to remove her, Schar is isolated and furious. She takes the stage dressed as legendary comedian Moms Mabley, delivers a monologue connecting Mabley's childhood rapes to the biblical story of Bathsheba, then strips down to fake maple leaves in an Eve-like tableau, announcing she is there to tell the truth.
The narrative flashes back to Schar's fortieth birthday in late September 2010. She is frustrated by a marriage in which she feels secondary to the church: David defers her birthday celebrations, prioritizes sermon preparation over intimacy, and undermines her parenting of their daughter, Gabrielle, an almost-sixteen-year-old gifted classical pianist. Also in the household is Marcus, David's cousin, raised by David's parents after his own parents died, now serving as the family's private chef. Quiet and observant, Marcus becomes a steady, nonjudgmental presence in Schar's life. Schar's only real ally among the First Ladies is Karolyn Tate, wife of a Denver megachurch pastor. Every birthday, Schar hopes for a call from Petra Addo-Moore, her estranged best friend since eighth grade. Their friendship ruptured seventeen years earlier when Schar, pressured by Sheila Battle, Hope in Christ's head deaconess, replaced Petra as maid of honor because Petra's agnosticism and bisexuality were deemed unsuitable for a pastor's wedding.
At Schar's lavish birthday extravaganza, the Bailey twins invite her to compete in the following year's pageant. Her elation dims when she learns the contestant list includes nearly all the women who iced her out after a disastrous couples' retreat she organized in Honolulu a decade earlier, including her most hostile adversary, Daphne Lancaster, Jeddah's wife. In October, at the annual breast cancer walk Schar does in memory of her mother, Annetta, who died when Schar was twelve, she nearly collides with Petra's car. Petra approaches briefly and tells Schar to watch where she is going, but the exchange is not an invitation to reconnect. Schar reveals a secret even Petra does not know: Her mother did not actually die of breast cancer.
In February 2011, Jeddah contacts Schar and insists they meet in Mercy County, a rural area south of Belleton. By a creek behind a derelict diner, he delivers devastating news: His dying grandmother, Evelyn Lancaster, wants to unburden her conscience. Jeddah's late father, Rev. Jeddah Lancaster Jr., groomed and raped Schar's teenage mother when Annetta was fifteen and working as a babysitter for the Lancaster family. Schar is Jeddah's biological half sister. His father also contracted AIDS and transmitted it to Annetta during a later encounter, confirming Schar's suspicion about her mother's true cause of death. Jeddah demands silence, predicting correctly that Schar will comply to protect her own position. The following day, Schar visits the dying Evelyn, who expresses regret for covering up her son's crimes and warns Schar: "Never bear a man's secrets."
At home, Schar tells Gabrielle that Jeddah is her half brother but withholds the AIDS information, resolving to bury the secret. When the pageant's launch week is held in Honolulu, Schar is paired with Jennifer Smith, a divorced and remarried First Lady from Dallas who becomes a genuine friend. Jennifer reframes the other wives' hostility as rooted in purity culture's sexual shame rather than in anything Schar did. Over the week, Schar arranges a tea-time apology session where all contestants except Daphne offer forgiveness. Linda Nash, one of the contestants, privately thanks Schar for the original retreat, which reignited her dormant sex life. On the final night, even Daphne breaks down sobbing about Jeddah's infidelities and quietly thanks Schar for speaking about how men's behavior forces women to turn on each other.
As their plane lands in Atlanta, TMZ publishes photos of Jeddah with his arm around Schar near the Mercy motel, framing the images as evidence of an affair. Daphne attacks Schar on the plane. David initially believes Schar cheated but comes around when she shows him their resemblance and reveals they are half siblings. Jeddah holds a press conference claiming they had a brief affair. David pressures Schar to accept a "contrition campaign" devised by crisis consultants: She would publicly claim to have a sex addiction and undergo ninety days of rehabilitation supervised by Sheila. Schar reconnects with Petra, who reached out after the scandal, and tells her the whole truth, including that Annetta died of AIDS. Aunt Marie, Schar's only living blood relative, reveals the full history: Lancaster groomed Annetta from adolescence, telling her God had brought them together, and Annetta never understood what happened as rape. When Schar learns the church elders have threatened to relieve David of his duties if she does not comply, she capitulates, and a statement announces she has entered treatment for sex addiction.
The lie devastates Schar's relationships. Gabrielle confronts her mother repeatedly for not practicing what she preaches. Schar's connection with Marcus deepens into undeniable romantic tension. Then Gabrielle reveals that David told her during a trip that Schar truly has a sex addiction, making Gabrielle promise secrecy. Schar is enraged to learn David was laying groundwork to divorce her if she did not comply. She declares all bets are off. On Election Night, after Jeddah wins the mayoral race, Schar and Marcus share their first kiss, though she pulls away before the encounter goes further.
Weeks before the pageant, Sarai Lancaster, Jeddah and Daphne's teenage daughter, delivers a Bible that Evelyn wanted Schar to have. It is inscribed to Schar and signed "Your Grandmother" by the former First Lady USA 1965. Armed with this evidence, Schar rewrites her monologue. On Pageant Night, she reveals on live television that Jeddah is her half brother, that their father raped her teenage mother, and that she was coerced into a false confession. She reads aloud the Bible's inscription, proposes a DNA test, and publicly apologizes to Petra, declaring she will never again call any place home where Petra is not welcome. After the monologue, Schar helps a devastated Daphne off the floor and convinces her to return to the stage, arguing that if Daphne stays down, men will control the narrative. Schar wins the crown. David comes backstage and suggests they work with consultants, but Schar tells him the woman he married is gone.
An epilogue set one year later shows Schar divorced and living in a restored rooming house on Belleton's East Side. In an interview on media mogul Vashti's talk show, she discusses her forthcoming book
Divorce and Rejoice and her deepest regret: failing Petra as a friend. She has given away much of her divorce settlement, emceed a fundraiser for an HIV/AIDS charity, resigned as First Lady USA, and no longer attends church, acknowledging her doubts about God. Daphne, as first runner-up, ascended to the crown. Marcus has started his own private chef business, and after 422 days of intentional courtship, the two consummate their relationship. In a final scene set in Nice, France, Schar calls Petra from a café after going skydiving. For the first time in months, Petra answers.