It's 1791 and Wolfgang Amadeus Mozart is Vienna's brightest star. But six weeks after he tells his wife that he has been poisoned, the great composer is dead. The city is buzzing with rumors of infidelity, bankruptcy and murder. Wolfgang's sister Nannerl refuses to believe such base gossip. As she looks closer, Nannerl finds traces of something sinister: a Masonic secret that might just be connected to Wolfgang's death. And as she listens to his bewitching last opera, The Magic Flute, she realizes that the arias might contain more than just music.