In this episode, written by Mark Gatiss and Steven Moffat, long-buried secrets catch up with the Baker Street duo. Someone has been playing a long game indeed and Sherlock and Watson face their greatest ever challenge. Is the game finally over?
In episode two Sherlock, Season 4, Sherlock faces perhaps the most chilling enemy of his long career: the powerful and seemingly unassailable Culverton Smith, a man with a very dark secret indeed. "The Lying Detective" is written by Steven Moffat. Benedict Cumberbatch returns as Sherlock Holmes, with Martin Freeman as John Watson, Mark Gatiss as Mycroft Holmes, Rupert Graves as Inspector Lestrade
The mercurial Sherlock Holmes (Benedict Cumberbatch) is back once more on British soil, as Doctor Watson (Martin Freeman) and his wife, Mary (Amanda Abbington), prepare for their biggest challenge yet: becoming parents.