Set in 1953 in the Fillmore district of San Francisco, a vibrant Black neighborhood, the novel follows Vivian, a nurse and single mother who fled racial violence in rural Louisiana 25 years earlier. After Klansmen smashed her bedroom windows and dragged her father to his death, Vivian fled west with Ellis, who married her after they crossed the state line. Ellis gave her three daughters and then died of a heart attack. Sustained by a tight-knit community, including her neighbor Mary, Vivian has poured her ambition into training her daughters as a singing trio called the Salvations, rehearsing them on the rooftop of their building. She believes stardom will deliver the security and renewal of faith she has been chasing since her journey west.
The three sisters each carry a distinct relationship to performing. Ruth, the eldest at 24, possesses a deep, powerful voice but secretly longs for domestic life with Gerry, Mary's son and her childhood friend. Esther, 22, works three times harder for less natural talent and struggles with dark moods that began after a club manager named Mr. Sterling groomed and sexually exploited her when she was 12. Ruth had tried to warn Esther, but after the incident, when Esther knocked on Ruth's door seeking comfort, Ruth did not answer. That unanswered knock became the root of a lasting rift between them. Chloe, the youngest at 20, has the widest vocal range and loves performing most purely but lacks Ruth's raw power. Vivian privately acknowledges that without Ruth, the dream cannot survive.
The inciting event arrives when a music manager named Mr. Franklin Dyers proposes managing the Salvations. He envisions a national tour and a record deal, insisting girl groups are the wave of the future and identifying Ruth as the indispensable center. Vivian agrees, though the plan means her daughters would travel without her. Walking home at dawn, she hears a police officer mention that the City's Redevelopment Agency has labeled the neighborhood "blighted" and hired a new administrator, Mr. Belmont, to take action. Vivian dismisses the warning.
When Vivian announces Mr. Franklin's offer, Ruth counters with her own news: She is pregnant and plans to marry Gerry. Vivian argues passionately that Ruth will regret choosing domesticity, but Ruth stands firm. Meanwhile, at the Champagne Supper Club, Chloe meets James, a white man recently arrived from Washington, DC. His sincere attention fills a loneliness she has been carrying. Though she knows a relationship across the color line is forbidden, his words stay with her.
Esther, who works at Horace's bookstore and finds her truest self there, sees Ruth's departure as her opportunity. When white officials, including Mr. Belmont, offer to buy the bookstore as part of a plan to acquire the entire block, Esther helps Horace organize resistance. They canvass the neighborhood, convincing most business owners to refuse. Mr. Bailey, owner of the Champagne Supper Club, is the holdout. Esther strikes a deal: She and Chloe will resume performing at the club if Mr. Bailey refuses to sell. He agrees.
Preacher Thomas, the widowed pastor of Shiloh Baptist Church, delivers a pointed sermon the Sunday Mr. Franklin visits, urging surrender to God's plan and cautioning Mr. Franklin against blocking the sisters' path. Mr. Franklin, moved, tells Vivian he would consider signing the duo if they land a prestigious gig. Ruth and Gerry marry, with Vivian giving Ruth her mother's emerald brooch, the last physical connection to her Louisiana home. As the wedding party exits the Champagne Supper Club, they find a demolition notice taped to the door: The club is to be torn down within 30 days.
Part Two opens with Ruth struggling through the isolation of new motherhood. She sneaks out one night to Bop City, a jazz club where Esther and Chloe now perform, and rediscovers herself singing along under her breath. Meanwhile, Esther falters onstage without Ruth, her mistakes more visible in a duo. After one strong performance, she overhears Mr. Franklin tell Mr. Bailey that Chloe is the real star, calling Esther's presence "unfortunate." Esther is shattered.
When Vivian announces that the Dunbar Hotel, a prestigious venue in Los Angeles, still wants them to audition, the date falls on the same day as Horace's largest demonstration against the demolitions. Esther stays behind to perform an original protest song at the rally, feeling a liberation she never found onstage with her sisters. In Los Angeles, Chloe performs solo and stuns the auditioners. Vivian is furious at Esther's absence but eventually accepts her choice.
Chloe's relationship with James deepens through double dates with Tony, her gay best friend, and Tony's boyfriend Ed. They face hostility from white passersby, and the outside world presses in. Vivian, meanwhile, resists a deepening romance with Preacher Thomas, who proposes marriage. She fears losing someone again. She auditions replacement singers from the church, but they are mediocre. When Chloe suggests performing solo, Vivian insists on a trio. Alone in the church, she feels doubt about her lifelong dream for the first time.
Freddy, a neighborhood fixture who has recently gotten sober, tells Vivian he saw Chloe kissing a white man connected to the redevelopment officials. Vivian confronts Chloe, connecting the relationship to the violence that drove her from Louisiana. Chloe defends herself, accusing her mother of abandoning her for Preacher Thomas. Vivian refuses to attend Chloe's upcoming Dunbar audition. Chloe goes alone, performs Esther's original song, and reaches a new artistic depth. The hotel offers her a regular position as opening act. Then, at Tony's house, Mr. Belmont arrives to serve an eviction notice and calls out to his son: James. Chloe recognizes him instantly. His father is the man dismantling her neighborhood. James tells her he has confronted his father and separated himself from the work, but Chloe ends the relationship, saying the world they live in will not accommodate them. Something grows inside her after he leaves, not from him, but from herself.
The family receives eviction notices. Vivian and Preacher Thomas plan to move to Vallejo with Ruth's family. Mary will relocate to Oakland. Esther considers following Horace south to join the civil rights movement. Mr. Franklin arranges a meeting at Bop City, bringing Vivian and Chloe together without telling either the other will be present. He offers to manage Chloe as a solo artist, saying the Dunbar gig is the proof he needed. For the first time, Vivian defers to her daughter, saying the choice is Chloe's. Chloe accepts. After the celebration, Vivian goes home and climbs to the rooftop one final time. She begins singing "Underneath the Harlem Moon," the song that inspired everything decades ago when she was a girl watching three Black women perform at a white woman's party. Her voice carries wider than she knew was possible. The power she spent years cultivating in her daughters has lived inside her all along.