Everyone knows the musical genius Mozart, but his sister, Maria Anna, has long been overshadowed by Wolfgang Amadeus. He is the one and only "child prodigy," a superstar with many problems, but Maria Anna is just as talented as her brother. When he is dismissed from his position in Salzburg, she sees an opportunity to escape an arranged marriage by helping him find a position at the court of Emperor Joseph II in Vienna. But Amadeus's erratic behavior jeopardizes their plan.