The Covenant Creek Kids: The Mystery of Granddaddy Meek Hardcover Book and Audiobook by Whitney White

Instead of staying home or going to summer camp like their friends, Brennan and Addison are spending part of their summer vacation with their great-grandparents, Mama D and Granddaddy Meek, but they have a feeling Granddaddy Meek doesn't want them around.

In spite of his brusque demeanor, when Granddaddy Meek catches them rummaging around an old chest hidden away in the closet, he begins to share with them why he loves America so much. In the process, they find a new love for a real American hero.