In 1880s Paris, an orphan girl named Félicie, who dreams of becoming a ballerina, runs away from her orphanage with her friend Victor. They become separated, and Félicie finds work at the Paris Opera, befriending a mysterious cleaner named Odette. When Félicie discovers the daughter of a wealthy restaurant owner, Camille, practicing ballet, she becomes jealous and decides to assume Camille's identity to get into the prestigious school of the Paris Opera Ballet and pursue her dream.

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A talented but unstable ballerina's descent into madness blurs the lines between reality and fantasy as she prepares to star in a production of Swan Lake.