In a foggy archipelago called the City of Islands, twelve-year-old Mara has always been fascinated by the magic that drifts on the air as songs. But as a servant for the powerful Lady of the Tides, Mara must earn her keep by searching for magical treasures deep in the murky ocean. Then Mara finds the skeletons of strange hybrid creatures that haven't existed in the city for centuries--all humming with a powerful spell-song. Convinced her discovery...