Amazing Airship Adventure

It is London, 1897, twins Emma and Jimmy MacDougall and their parents are having a pleasant dinner with Sherlock Holmes when a commotion draws them to the window. A flying airship is heading up Baker Street terrifying horses and pedestrians alike. Something comes flying out of the airship and the window explodes around them. A note attached to the rock threatens not only 221B and its residents, but all of London, besides. Holmes and Watson begin to search for the airship and its owner, but soon Sherlock Holmes recognizes that he needs extra eyes on the street. Adults may be too busy to watch what's going on over their heads, but children will have spotted something. Getting their father's permission, Holmes sends the twins to find out who has spotted what. With the help of a newspaper boy and a young hansom driver, the twins track the likely owner of the airship to a circus tent and send the driver back to alert Holmes. Soon they find themselves trapped in the ship itself, which is slowly rising out of the tent, on its way to blow up 221!