Believed dead after his fatal encounter with Moriarity three years ago, Holmes returns to England to foil a murder plot against him by a former Moriarity gang member.

The headmaster of a prestigious prep school calls on Holmes for help when the ten year old only son of powerful but publicity-shy duke disappears.

Holmes is asked by the country's Prime Minister to aid in the recovery of a stolen diplomatic letter, which, if published, might lead England into war.

An obscure family document containing an enigmatic ritual holds the key to a hidden treasure if Holmes can decipher the mystery.

Holmes is called to a manor house to investigate the brutal murder of a country lord with a fireplace poker and reconcile the story of his bruised and battered wife with the facts.

Responding to a grieving wife, Holmes investigates the apparent murder of her husband in an apartment above an opium den.

Lastrade reveals to Holmes that someone has been inexplicably breaking into homes for the senseless purpose of breaking small busts of Napoleon.

While convalescing in Cornwall, a depressive Holmes investigates the apparent death from apoplexy of a local woman and the unexplained sudden dementia of her two brothers.

Holmes investigates the disappearance of a champion racehorse and the murder of its trainer on a lonely moor.

A bored Holmes eagerly accepts a case involving the disappearance of an amateur Spanish cartographer as well as his servants from his rented country lodge.

Sherlock's brother Mycroft enlists his younger sibling to locate missing patent plans that pertain to a strategically critical state-of-the-art submarine.