Ivory Westbrook is a seventeen-year-old piano prodigy living in poverty in Treme, a historically Black neighborhood in New Orleans. She attends Le Moyne Academy, an elite performing arts high school, on a tuition her late father, Willy Westbrook, a white jazz pianist, paid in full by selling his beloved piano bar when she was ten. Three years later, Willy was shot and killed during a fight at that same bar, leaving Ivory with a frequently absent mother who uses drugs, an abusive older brother named Shane, and no income. To cover her family's bills, Ivory does homework for wealthy male classmates in exchange for cash, an arrangement that regularly escalates into coerced and unwanted sex. She has also been raped repeatedly since age thirteen by Lorenzo Gandara, Shane's best friend and fellow Marine, who assaults her whenever he can corner her alone. At school, Ivory faces relentless bullying from privileged peers who mock her poverty. Her sole allies are Stogie, a ninety-year-old music shop owner who lets her practice on his old Steinway piano, and Sarah, a classmate she confides in.
Ivory's senior year brings a new music director: Emeric Marceaux, twenty-seven, a pianist in the Louisiana Symphony Orchestra who holds a master's degree from the prestigious Leopold Conservatory of New York. Emeric lost his previous position as Head of School at Shreveport Preparatory after he was discovered in a consensual BDSM encounter with Joanne, a fellow teacher and his secret girlfriend of four years. Joanne let the incident appear nonconsensual to protect her own career, and while the charges did not stick, the scandal destroyed Emeric's reputation. Beverly Rivard, Le Moyne's dean, hired Emeric because his mother, Laura, still sits on Leopold's Board of Trustees and can help Beverly's undeserving son, Prescott Rivard, gain admission. In exchange, Beverly gave Emeric a job no one else would offer. She also forced out the previous music instructor, who had planned to recommend Ivory for Leopold, and deleted Ivory's college-preparedness materials from her student file.
When Ivory walks into Emeric's classroom on the first day, he mistakes her for a teacher because of her mature appearance. An immediate, volatile dynamic takes hold. He recognizes her extraordinary musical talent, her poverty, and the signs of abuse in her split lip and guarded body language. Over the first weeks, he buys her textbooks and a tablet, drives to Treme to punch Shane for hitting her, and begins intensive private piano lessons that stretch four hours each day. When Ivory performs Balakirev's Islamey, one of the most technically demanding pieces in the classical piano repertoire, Emeric tells her the interpretation was stunning, reducing her to tears. Their sessions grow increasingly charged. After Ivory throws a marker at his forehead in frustration, he spanks her as punishment, and she discovers that controlled, consensual pain produces a euphoric warmth entirely unlike the abuse she has endured. He puts her shoes on her feet with careful tenderness, a gesture that shocks her because no man has ever touched her without taking something in return.
Emeric kisses Ivory in a public park and then abruptly pulls back, declaring that further physical contact must stop because of the legal risks. For five weeks, he maintains strict professional distance while applying for jobs out of state. Meanwhile, Ivory continues her arrangement with Prescott, enduring unwanted sex in his car to pay her family's bills.
The stalemate breaks when Emeric overhears Prescott and another student, Sebastian Roth, arguing over their "arrangement" with a girl. He tracks down Prescott's usual meeting spot, drives to the vacant lot, and finds Prescott on top of Ivory in the back seat of a car. He beats Prescott and threatens him with exposure if he speaks or contacts Ivory again. Emeric takes Ivory to his Garden District estate, where she confesses the full scope of her sexual history: Lorenzo's initial rape at thirteen, years of subsequent assaults, the homework-for-sex arrangement, and an estimate of sixty to eighty or more partners, most encounters unwanted. That night, Emeric brings Ivory to orgasm for the first time, an experience that stuns her. He moves her into his home, citing Lorenzo's ongoing threat, and fills an entire closet wall with designer clothes in her size. They retrieve Schubert, her orange tabby cat, the last gift her father gave her before he died.
Their relationship deepens through daily routines of discipline, music, and growing intimacy. Emeric selects Ivory as the piano soloist for Le Moyne's Holiday Chamber Music Celebration, and she delivers an exceptional performance. After hours in the school theater one evening, Ivory initiates oral sex with Emeric, choosing to do so willingly as an act of giving rather than coercion; he instructs her to raise her hand if she wants to stop, transferring the power of consent to her. Meanwhile, Emeric hires a private investigator who identifies Lorenzo's criminal record and pressures police into arresting him. He also arranges for a woman named Deb to seduce and secretly record Beverly's husband, storing the footage as leverage against the dean.
When Emeric sends Ivory to his father's medical clinic for an exam, she encounters Joanne, visibly pregnant and claiming to carry Dr. Marceaux's grandson. Ivory is furious that Emeric concealed the pregnancy. Soon after, three developments converge: a paternity test confirms the baby is not Emeric's, Ivory's health results come back clean, and Lorenzo is detained on multiple charges. During foreplay, Ivory uses her safe word, "Scriabin," for the first time, establishing her absolute limit due to Lorenzo's repeated assaults. Emeric stops immediately and without anger, then gives her a choice. She leaves a trail of clothing up the staircase. They have sex for the first time with Ivory on top, controlling the pace, a deliberate inversion of every prior experience.
Months later, Lorenzo is released early from jail after a successful appeal. Shane, who has been watching Emeric's house, helps Lorenzo break in while Ivory is home alone, sick. Lorenzo kills Schubert and attempts to rape Ivory. She fights back, and Shane intervenes when he discovers what is happening. Emeric arrives and strangles Lorenzo to death with his belt while Shane holds the body down. Recognizing that calling police would expose his living arrangement with a student, Emeric and Shane dispose of the body. They bury Schubert in the backyard. Shane agrees to disappear permanently.
On Ivory's eighteenth birthday, Emeric flies her to New York for a surprise audition at Leopold. She opens with a modern pop song that violates every classical convention, then silences the room with a flawless excerpt of Islamey. She declines Leopold's open offer of admission, explaining that she has found the instructor she needs in Emeric. Her dream, she realizes, is not a specific institution but the lights, the audience, and the music, pursued on her own terms.
Back at Le Moyne, Beverly uses hidden camera footage from the school theater showing Ivory in a sexual encounter with an unidentifiable figure to expel her for misconduct. Emeric identifies himself as the man in the video and presents Beverly with the recordings of her husband's affair, forcing Beverly to reinstate Ivory. Emeric submits his resignation, freeing Ivory to graduate without further interference.
After graduation, Emeric reveals the future he has built: a dueling piano bar in the French Quarter called "Emeric and Ivory," featuring two grand pianos side by side, one of which is the Steinway from Stogie's shop that Emeric secretly purchased months earlier. Stogie will help manage the bar from a nearby townhouse Emeric arranged for him. An epilogue set three years later shows Ivory and Emeric, now married, performing together nightly at their packed bar, fulfilling Ivory's dream of the lights, the audience, and the music.