Black Swan is a psychological thriller about Nina, a ballerina in a New York dance company. Nina is chosen to play the lead role of the Swan Queen but struggles with the dark sexuality required for the Black Swan role. Nina begins having hallucinations and losing her grip on reality as the pressures of the role intensify. The film explores Nina's psychological breakdown through her developing anorexia, bulimia, and schizophrenia. It also examines the themes of competition, sexuality, and control through Nina's rivalry with fellow dancer Lily and overbearing relationship with her mother.