Hound is returning to England, but while crossing the English Channel, the ship he's on is attacked by pirates who are after one of the passengers. With the aid of another passenger, Dr. John Watson, Hound attempts to save the day.

Moriarty enters a prestigious airplane race, with the intent of sabotaging his way into first place, including stealing parts from other entrants to make his plane the best. Mrs. Hudson, Hound and Watson enter the race in hopes of stopping him.