The Hound of the Baskervilles (1939 film) in the Victorian period of the original stories; all known previous "Holmes" films, up to and including the 1930s British film series starring Arthur Wontner as Holmes, had been updated to a setting contemporaneous with the films' release. It is also the only film in the series to be a strict adaptation of a source material, while subsequent installments would feature original titles and incorporate various elements of different stories. Sherlock Holmes (Basil Rathbone) and Dr. John H. Watson (Nigel Bruce) receive a visit from Dr. James Mortimer (Lionel Atwill), who wishes to consult them before the arrival of Sir
Sherlock Holmes and the Secret Weapon of a Swiss scientist by their nemesis Professor Moriarty, to steal a new bomb sight and sell it to Nazi Germany. Sherlock Holmes and Dr. John Watson have to crack a secret code in order to save the country. The film is one of four films in the series which are in the public domain. Sherlock Holmes (Basil Rathbone) pretends to be a Nazi spy to aid scientist Dr. Franz Tobel (William Post Jr.) and his new invention, a bombsight, in escaping a Gestapo trap in Switzerland. Holmes and Franz fly to London, where Holmes places him under the protection