Dirk lives in his castle with his father, Baron Kay. He plans an excavation of a cave with his friends, Reggad, Teddy, and Laddie. Laddie distracts the field guard at the Baron's hydroplane so the group can take it for the expedition. Taking the vehicle, they meet Reggad at the site where the boy had already taken the required tools. Teddy isn't there with the boxes when they arrive, but they proceed. Laddie finds a revolver which Dirk examines. It's from 1937 from an inscribed date, "almost 500 years ago". As the two are looking at the pistol, Reg broke a hole into the ground and fell into it.