In the summer of 1908, in Muskegon, Michigan, a visiting troupe of vaudeville performers is about the most exciting thing since baseball. They're summering in nearby Bluffton, so Henry has a few months to ogle the elephant and the zebra, the tightrope walkers and a slapstick actor his own age named Buster Keaton. Henry longs to learn to take a fall like Buster, "the human mop," but Buster just wants to play ball with Henry and his friends.