Once upon a time was a former prima ballerina called Cinderella. After her mother’s death she became a servant in the dance company of her stepmother and her two stepsisters. The invitation to a charity gala performance, which the celebrated solo dancer Frdric will attend, looking for an equally gifted new partner, is going to change her life. Heinz Spoerli has the great idea to turn Cinderella into a poor and wretched corps de ballet girl in a provincial company, exploited and humiliated by the wicked ballet mistress who favors her own two daughters – with the Good Fairy as a haggard rehearsal pianist. The stepmother and both stepsisters are played in drag.