Fifteen-year-old Marty, her grandmother, and their macaw, Methuselah, live in a big old family house on Heron Shoals Island. When they’re asked to board a young musical prodigy, his father, and his professor for the next couple of months, Marty senses disaster on the horizon. The group soon becomes friends, though, as they find themselves working together to solve a thrilling and complicated mystery. If they can solve it, life at the old home on Heron Shoals Island will never be the same again.