In this modernized version of the Conan Doyle characters, using his detective plots, Sherlock Holmes lives in early 21st century London and acts more cocky towards Scotland Yard's detective inspector Lestrade because he's actually less confident. Doctor Watson is now a fairly young veteran of the Afghan war, less adoring and more active.
Did You Know?
In the American (PBS Masterpiece Mystery) broadcasts of this series, certain letters in the closing titles are highlighted red. These letters spell out a word that somehow relates to the episode. These highlighted letters don't occur in the closing credits of the original airings of the series (on BBC) though. See more