French filmmaker René Féret writes, directs and produces this imagined portrait of Wolfgang Amadeus Mozart's older sister Maria Anna 'Nannerl' Mozart. Despite being a talented musician and composer in her own right, Nannerl (played by the director's daughter Marie Féret) is forced to act as accompanist to her brother, who is five years younger. As she comes of age in this difficult and ambitious family, monopolised by the domineering Leopold Mozart (Marc Barbé), Nannerl must suppress her own creative and sexual impulses to conform to the social conventions of the day.