Sherlock Holmes and Doctor Watson are on a ship on their way to London, and the ship is hijacked.

The son of a British aristocrat is the main suspect in the theft of the Crown of Mazalin, which belongs to the queen; Holmes is immediately called to the scene to investigate.

Holmes suspects Professor Moriarty for the counterfeit money problem in London.

Professor Moriarty thinks he has found a weakness in Hound.

A little girl pickpockets Professor Moriarty's stolen gem.

A mysterious green balloon lands in Hound's backyard.