 Mark Gatiss wrote " The Hounds of Baskerville " , which investigates the strange activities at a military base . Aware that The Hound of the Baskervilles , first published in 1902 , was one of the most famous of Conan Doyle 's original stories , Gatiss felt a greater responsibility to include familiar elements of the story than he does when adapting the lesser @-@ known stories . Russell Tovey appeared as Henry Knight , a man whose father was ripped apart by a gigantic hound on Dartmoor twenty years earlier . Directed by McGuigan , the episode was first broadcast on 8 January 2012 . 
