investigate a man named Von Bork. Ten Years Beyond Baker Street by Cay Van Ash is set during Holmes's undercover search for Von Bork; it tells how he divides his time between his counter-espionage task and a search for Sir Denis Nayland Smith, believed to have been kidnapped by Fu Manchu; thus, Van Ash combines the worlds created by Conan Doyle and Sax Rohmer. The story is continued in Robert Ryan's 2015 novel A Study in Murder, the third in his "Dr Watson" detective series, in which Von Bork torments Dr Watson, now a prisoner of war in Germany, and arranges for him to be exchanged for Sherlock Holmes so that he can exact his revenge. Peter Brown wrote "Anyone having any knowledge or experience of actual intelligence work could not help a gasp of horror at what Sherlock Holmes is doing in 'His Last Bow'. Having by patient hard work established his credentials with the Germans and being in a perfect position to go on feeding them false information for the rest of the war, Holmes for no reason whatsoever blows his own cover and destroys everything. Why, for God's sake? Why? How I wish I could reach into that room and shout at Holmes: 'Stop! What are you doing? Are you crazy?'. Alas, this story with its monumental blunder must remain forever as it is. Conan Doyle had a wide knowledge of many subjects - evidently, intelligence work was not one of them. There were in 1916 England some people he could have profitably consulted on the subject." Adaptations Film and television A silent short film based on the story was released in 1923 as part of the Sherlock Holmes film series by Stoll Pictures. Eille Norwood played Sherlock Holmes and Hubert Willis played Dr. Watson. The 1942 American film Sherlock Holmes and the Voice of Terror starring Basil Rathbone is credited as an adaptation of this story. "His Last Bow" was adapted as part of the storyline in the 1986 Soviet film The Twentieth Century Approaches, the final entry in the Adventures of Sherlock Holmes and Dr. Watson film series. An episode of the animated television series Sherlock Holmes in the 22nd Century was based on the story. The episode, titled "The Secret Safe", aired in 2001. Radio "His Last Bow" was dramatised by Edith Meiser as an episode of the American radio series The Adventures of