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 (1959 film) Sherlock Holmes (Cushing) and Doctor Watson (Morell) to investigate the death of his friend Sir Charles Baskerville; he believes that Sir Charles was killed by a monstrous hound that, legend has it, killed his ancestor Sir Hugo Baskerville (David Oxley) centuries before. Intrigued, the pair go to meet the new owner of Baskerville Hall, Sir Henry (Lee). Holmes remembers that he is going to be away on another case, and leaves Watson to look after Sir Henry. A tarantula attacks Sir Henry briefly in London; Holmes suspects foul play. Before he leaves, Holmes reminds Watson not to let Sir Henry