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 up into individual leaves as part of a promotional campaign by Doyle's American publisher - they were used as part of window displays by individual booksellers. Out of an estimated 185-190 leaves, only 36 are known to still exist, including all the leaves from Chapter 11, held by the New York Public Library. Other leaves are owned by university libraries and private collectors. A newly rediscovered example was sold at auction in 2012 for US$158,500. The novel uses many traditional novelistic techniques which had been largely abandoned by the time of writing, such as letters, diary extracts, interpolated manuscripts, and