Viola, a high school soccer player, is devastated when her girl’s team is cut. Determined to keep playing, she concocts a plan to disguise herself as her twin brother, Sebastian, and take his place at his new boarding school, Illyria, while he pursues his music dreams in London. Viola, now posing as Sebastian, tries out for the boys' soccer team and impresses the coach. She faces one major problem: her roommate Duke, the team's star forward, who has no idea of Viola’s disguise and initially thinks she's odd.

As Viola navigates her double life, she juggles a growing attraction to Duke, who is smitten with Olivia, a beautiful classmate; meanwhile, Olivia starts to fancy the sensitive "Sebastian," unaware it's really Viola in disguise. Chaos ensues when the real Sebastian returns earlier than expected. The situation spirals further into confusion and comedy, as relationships are tested and true identities are on the brink of exposure.