A little girl named Polly pickpockets a gem Professor Moriarty has just stolen, and he is determined to stop at no end to get it back.

Someone has been sabotaging England's new Air Mail postal service to Europe, and it's up to Hound, Watson and Mrs. Hudson to find out who.

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.

Sherlock Hound and Doctor Watson are asked to investigate the disappearance of twenty Sovereign Gold Coins from a specially constructed safe.

Hound and Watson are invited to the first unveiling of "The Sacred Sword of the Wizards" in decades, but when the safe containing it is broken into and the sword isn't even touched, it's up to Hound to figure out why.

When the Rosetta Stone literally floats away from the British Museum, Hound wonders if it has to do with various countries' claims to the stone.

Hound suspects Professor Moriarty for the rising counterfeit money problem in London, but is unable to find any leads until a little girl comes asking Hound to help her find her father.

Professor Moriarty thinks he has found a weakness in Hound, his land lady Mrs. Hudson, and so sets about kidnapping her, but things don't go as he planned.

An aristocrat's son is the main suspect after a crown on loan from the Queen goes missing. Hound is asked to investigate, not knowing Professor Moriarty has been watching the location.

A mysterious green balloon lands in Hound's backyard, with a message asking for help as the sender is being held prisoner on Dolphin Island.

A young girl returns to England after several years in America and finds her uncle is not quite who she remembers.

A freight car in the middle of a passenger train disappears en route to London, and Hound must figure out how.

Moriarty is after a large diamond, but after hiding it in a doll, he ends up with more than he bargained for.

The Royal Navy asks Hound and Watson to help them recover a submarine stolen by Professor Moriarty.

There's a new thief in London, one that puts Moriarty to shame, and their next target appears to be the Queen's favorite horse.

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 succeeds in stealing a large gold statue, but Hound is able to track his escape, learning that Moriarty hid it somewhere by the docks, and must find it before Moriarty returns.

When a bank's entire collection of gold is stolen the same night a sculptor disappears, Moriarty becomes the first suspect when sketches of a gold statue in his likeness are found at the sculptor's house.

A sea monster seems to be attacking ships on the River Thames and devouring them whole, and after a passenger goes missing in one of the attacks and no body can be found, Hound is called in to find him.

Hound must find three art students on holiday in London from France who have gone missing, while Inspector Lestrade tries to figure out why someone would steal artwork reproductions.

When Moriarty goes to great lengths to steal a parrot off a train, Hound takes up the case to find out what's so special about this parrot.

Big Ben's bell has been burglarized, but bureaucrats beseech Hound to keep that bit buried while they search, so as to burke blemishing England's dignity.

A large shipment of cash is being taken by carriage across the country, and due to sabotage the police are unable to escort the shipment, and so Hound is asked to shadow the shipment to ensure it arrives at its destination.

Moriarty has stolen a collection of diamond-encrusted coral lobster carvings and it's up to Hound and Watson to track him down.

Moriarty and his gang manage to steal a shipment of gold, but Inspector Lestrade's investigation is making it difficult for the gang to get the gold out of London. Meanwhile, Hound and Watson investigates an odd break-in and robbery at a company making a new blimp.