The Hounds of Baskerville order to test his theory. He also points out Sherlock was wrong for once; he believed the drug was in Henry's sugar and put it in John's coffee. In the closing scenes, Mycroft oversees the release of Jim Moriarty (Andrew Scott) from a holding cell in which he has written Sherlock's name all over the walls. The story is based on Arthur Conan Doyle's novel "The Hound of the Baskervilles", and also contains plot devices and lines from other Doyle stories: In June 2011, it was announced that Russell Tovey would appear in "Sherlock" series two in its second episode.
The Hound of the Baskervilles the like, as seen in the works of Henry Fielding and, later, Wilkie Collins. It incorporates five plots: the ostensible 'curse' story, the two red-herring subplots concerning Selden and the other stranger living on the moor, the actual events occurring to Baskerville as narrated by Watson, and the hidden plot to be discovered by Holmes. Doyle wrote that the novel was originally conceived as a straight 'Victorian creeper' (as seen in the works of J. Sheridan Le Fanu), with the idea of introducing Holmes as the "deus ex machina" only arising later. The "Hound of the Baskervilles" was first serialized