Rylee Hill, Kate Hallett, is an angsty, bullied teenage girl who clings to the music of Payton Adler, a troubled rock star whose songs feel like a lifeline. Her father is a detached cop who’s often away, and his girlfriend adds strain at home. With her only close friend, Sidney Aya Furukawa, she attends a Payton-led Floorplan concert, hoping to meet the star after the show. Sid leaves early to see a boy, while Rylee lingers, chasing a moment with Payton.
After the performance, Rylee is left at the venue when Sid doesn’t return. Payton, who travels with a strict tour crew that blocks private moments, frantically heads out to score more drugs and, in the parking lot, accidentally hits Rylee with his car. He offers her a ride to avoid drawing attention, all while texting and slipping back into old habits. In the ride, Payton buys and uses more drugs, and a quick stop nearly sends them into a crash as he blows through a red light, ending a few blocks from Rylee’s empty house.
Back at the house, Payton is still spiraling. Rylee, trying to be supportive, provides water and a pulse of calm, while Sid returns and is stunned to find Payton in Rylee’s space. Payton grows increasingly panicked, locking himself in the bathroom and thrashing against his restraints. Rylee and Sid decide to help him, moving him into a safer space, and at one point Rylee secures him to the bedpost with handcuffs to keep him from harming himself or others.
The next morning, Rylee believes this could be her purpose—that she’s meant to help Payton detox—while Sid worries about the danger. The plan is to hold him for a few days, but Payton’s manager begins a search, skeptical about any real harm given Payton’s relapse history. The situation spirals when Payton escapes during a chaotic move to a neighbor’s vacant house. A confrontation follows: Payton fights with Rylee and Sid, and Sid arrives just in time to strike with a car, helping to subdue him.
In the chaos that follows, Payton is restrained in the neighbor’s house, and Sid’s screams draw attention. Rylee’s fear and desperation mount, and in a shocking moment she accidentally kills Sid while shushing the crowd away from a passer-by. Gripped by fear, she tries to frame Chris for the murder, pivoting to a different way to protect herself and Payton.
That night, Rylee has a heartfelt talk with Payton about her mother’s death and how Floorplan’s music helped her survive, a moment that binds the two of them even as danger looms. Marnie, Ron Hill’s girlfriend, finds Payton and begs for help, but Rylee intervenes again and kills Marnie with a bat. She then returns to Payton, offering comfort, telling him she loves him, and placing her mother’s necklace in his possession as a symbol of their shared bond. Payton pretends to reciprocate, shows her lyrics he wrote, and then escapes.
The morning after, a murder scene unfolds as Payton is found dead and Marnie’s body sits in a car. Rylee’s father is called away to duty, and the necklace is discovered on Payton’s neck, which he hides as a grim reminder of what occurred. A year passes, and the world at large believes Payton died of an overdose. Payton’s prints are tied to the murder, and a posthumous Grammy-winning song emerges from his lyrics, cementing a haunting, if controversial, legacy surrounding the two unlikely figures whose fates became inseparable.
