Sprout loves his Grandma. He also likes trucks, trains, and seeing now places. But when Grandma invites him and his big sister on an overnight trip, Sprout is nervous. After all, he's never slept away from Mom and Dad before. Soon they are on the road passing big rigs, at a restaurant with dancing chickens, and in the shadows of the tallest-ever trees. With so much to see and phone home about will Sprout's doubts soon be forgotten?