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 in "The Strand Magazine" in 1901. It was well-suited for this type of publication, as individual chapters end in cliffhangers. It was printed in the form of a novel the following year. "The Hound of the Baskervilles" has been adapted for many media. Over 20 film and television versions of "The Hound of the Baskervilles" have been made. "The Hound of the Baskervilles" has been adapted for radio for the BBC by Bert Coules on two occasions. The first starred Roger Rees as Holmes and Crawford Logan as Watson and was broadcast in 1988 on BBC Radio 4. Following its