All 12 episodes from the first four series of the BBC's fast-paced modernised crime drama based on the characters created by Arthur Conan Doyle. Laptops, mobile phones and the internet are the new tools for crime in a modern London under threat from serial killers, bombings and gang warfare. Sherlock Holmes (Benedict Cumberbatch), the most brilliant intellect of his generation, has a unique analytical brain unlike anyone else's, and staves off the ever-present threat of boredom by solving crimes, the more intricate and baffling the better. Meanwhile, his friend and flatmate, John Watson (Martin Freeman), is an army doctor invalided home from the battlefields of Afghanistan. Series 1 episodes are: 'A Study in Pink', 'The Blind Banker' and 'The Great Game'. Series 2 episodes are: 'A Scandal in Belgravia', 'The Hounds of Baskerville' and 'The Reichenbach Fall'. Series 3 episodes are: 'The Empty Hearse', 'The Sign of Three' and 'His Last Vow'. Series 4 episodes are: 'The Six Thatchers', 'The Lying Detective' and 'The Final Problem'. The collection also includes the 2016 special 'The Abominable Bride'.