It's the 1890s and three children, Emilita, Maddy and Benjamin (who everyone calls Bongo), share a series of innocent adventures as they vacation in the seaside town of Tibbodnock. In "Boris the Kitten," the trio are awakened by a mysterious thumping sound coming from the attic -- and it won't go away! In "The Mystery of the Missing Duck," the young detectives must figure out what that big, hairy thing behind the barn door could be. In "The Treasure of the Cave," the sound of an angry pirate pierces the darkness as they search for a hidden treasure.