Jack and Annie travel to Vienna, Austria, in 1762 where they meet the young Wolfgang Amadeus Mozart and his sister and help save the budding genius' life.

Geronimo Stilton and his friends travel back in time to stop the Pirate Cats from stealing one of Mozart's most famous musical pieces.

In eighteenth-century Europe, Anna "Nannerl" Mozart, a musician whose talent and dedication is overshadowed by that of her gifted younger brother, Wolfgang, struggles to win the notice of her father and patrons who might further her career, despite her gender.