2. The Priory School

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.

3. The Second Stain

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.

4. The Musgrave Ritual

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

5. The Abbey Grange

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.

6. The Man with the Twisted Lip

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

7. The Six Napoleons

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

8. The Devil's Foot

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.

9. Silver Blaze

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

10. Wisteria Lodge

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.

11. The Bruce Partington Plans

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

12. Episode 12

13. Episode 13