Amid the glamour of Prince Nicholas Esterhazy's court in 18th-century Vienna, murder is afoot. Or so fifteen-year-old Theresa Maria is convinced when her musician father turns up dead on Christmas Eve, his valuable violin missing, and the only clue to his death a strange gold pendant around his neck. Then her father's mentor, the acclaimed composer Franz Joseph Haydn, helps her through a difficult time by making her his copyist and giving her insight...