Young Amish widow Rachel Yoder helps run a bed-and-breakfast in rural Lancaster County, Pennsylvania, and when a guest, journalist Philip Bradley, finds an old postcard in the dresser of his room, it touches off a surprising chain of events.

"Celebrate the fun that grandparents and grandkids can get up to in this action-packed undersea adventure--a companion picture book to Paul McCartney's bestseller Hey Grandude"--

One day, Duncan is happily coloring with his crayons when a stack of postcards arrives in the mail from his former crayons, each of which has run away or been left behind, and all of which want to come home.