Traveling to the quiet countryside can be a wonderful adventure, but spending the night in a new place can also feel a little bit spooky. Henry and his enormous dog, Mudge, are visiting Grandmother's house for the weekend. During the day, they love exploring the fields and enjoying the fresh air. But when the sun goes down and the lights turn off, the old country house begins to make strange and unfamiliar noises. Suddenly, a mysterious thumping sound echoes in the dark. Henry is worried, but he is even more concerned about how his big, easily frightened dog will handle the scary night. They must figure out what is making the bumping sounds before they can finally get to sleep. This gentle, relatable story explores the common childhood fear of the dark and the comforting power of a best friend.