Nannerl Mozart, sister of the famous Wolfgang, has a gift for music and wishes to be remembered forever--but for a woman in eighteenth-century Europe, that is never going to happen. She is allowed to perform only until she is of marriageable age--on order of her tyrannical father--but when her younger brother begins to eclipse her skills, she begins to despair of her life. Then, a mysterious stranger from a magical world arrives with an irresistible...