Born with a gift for music, Nannerl Mozart has just one wish: to be remembered forever. She delights audiences with her masterful playing, but has little hope she'll ever become the acclaimed composer she longs to be. She is a young woman in 18th century Europe, and that means composing is forbidden to her. She will perform only until she reaches a marriageable age-- her tyrannical father has made that much clear. Meanwhile the talents of her beloved younger brother, Wolfgang, shine brighter. His brilliance begins to eclipse her own, until one day a mysterious stranger from a magical land appears with an irresistible offer. He has the power to make her wish come true-- but his help may cost her everything.