On the evening of the Kennedy assassination, Jim MacLaine stops by his friend Mike Menary at the funfair where Mike works, and the conversation quickly pivots from shock to opportunity. Jim reveals that he’s joined a touring rock group called the Stray Cats, and he asks Mike to come along as their road manager, convinced that if the band breaks through, Mike could help them make millions. Mike proves to be a sharp operator, arranging a better van, better accommodations, and even a recording session for the group. Privately, Mike tells Jim that the band’s trajectory depends on one hard choice: the arrogant singer/ guitarist Johnny must go in order for the group to truly succeed. With Mike’s logistics and Jim’s growing popularity, the Stray Cats score their first hit, a song sung by Jim that is released as the B-side to a Johnny-led track. Jim suddenly becomes the focal point for fans and the press, while the embittered Johnny exits the band in response to the shifting power dynamics.
The band launches a successful tour across the United States, where a new manager, Porter Lee Austin, arrives with deep pockets and ambitious plans. He acquires a majority stake in Jim and the group, a move that amplifies Jim’s visibility while leaving the other members—especially the drummer J.D.—feeling sidelined. Jim, aided by his new girlfriend Danielle, begins to push back against Porter Lee’s approach, which treats Jim’s music as a marketable commodity rather than a personal expression.
Tragedy strikes when Jim’s mother dies suddenly. Jim, Danielle, and Mike return to England for the funeral, and Jim confronts memories of his past life: his wife Jeanette and their young son, whom he left behind but never formally divorced from. Jeanette’s absence is painful, and Danielle is stunned to realize Jim never disclosed his marriage and child. The funeral crowd swells with fans, and Danielle’s sense of complexity around Jim’s life deepens.
Back in the United States, tensions within the Stray Cats come to a head as J.D. and the others sever ties with Jim, leaving him as a solo act with only Mike and Danielle in his orbit. Undaunted, Jim undertakes an ambitious project: a progressive rock opera honoring his late mother, designed to be an expansive artistic statement. Meanwhile, Danielle clashes with Porter Lee and grows wary of Mike’s insinuations about Jim’s sexuality, leading Mike to orchestrate a staggering cover: Danielle witnesses Jim in bed with another woman, prompting her to walk out of his life.
Even as the rock opera captures a global audience when broadcast live to millions, Jim’s personal life remains unsettled. He relocates to a secluded castle in Spain and becomes a recluse, with Mike living as his caretaker and friend, though old resentments begin to surface between them. After a two-year withdrawal from the public eye, Porter Lee exerts pressure for Jim to emerge for a high-stakes television interview intended to generate much-needed revenue and prevent being forgotten.
On the day of the planned interview, Jim’s mental state falters; he refuses to leave his room. Mike orders him to perform, and Jim eventually appears, delivering curt, abrasive responses before breaking into uncontrollable laughter. Only Mike realizes that Jim has overdosed on drugs, and he races to summon help. An ambulance arrives, but Jim dies en route to the hospital, leaving behind a legacy built on talent, tension, and a life lived in the glare of fame.
