Mitchie Torres, a talented yet shy teenager, dreams of attending an exclusive summer music camp. Although her family can't afford the tuition, her mother secures a job as the camp's cook, allowing Mitchie to attend at a discounted rate. Excited yet nervous, Mitchie arrives at the camp and feels out of place among the wealthy and privileged campers. She conceals her true background by pretending her mother has a glamorous job. As weeks go by, Mitchie navigates through various camp activities and makes new friends, including the socially influential Tess Tyler. However, she often finds herself under pressure to maintain her fabricated story, leading to a series of misunderstandings and conflicts.

As Mitchie tries to balance her dual identity, she catches the attention of Shane Gray, a spoiled pop star tasked with teaching at the camp to improve his public image. Shane overhears Mitchie singing but doesn't see her face, sparking his quest to find the girl behind the voice. Drawn together by their mutual love for music, Mitchie and Shane develop a bond, but her fear of being exposed keeps her from fully opening up to him. The camp's climactic final jam approaches, offering Mitchie a chance to showcase her talent and be true to herself, but also risking her secret being revealed.