Book excerpt: The McNallys are visiting Michigan's Mackinac Island. Gavin and his brother, Gus, take a nature walk. Gavin wants to hunt for treasure at a nearby fort after the walk. When Gus goes missing Gavin is annoyed. But he soon comes to realize what treasure really means. Aligned to Common Core standards and correlated to state standards. Spellbound is an imprint of Magic Wagon, a division of ABDO.