Sherlock Holmes (1931 film series)

[4] Produced by Twickenham Studios, The Sleeping Cardinal was loosely based on "The Adventure of the Empty House"[4] with the noticeable change that in the film version, Ronald Adair is a card cheat.

Loosely based on "The Adventure of Charles Augustus Milverton",[4] the film altered the story converting a blackmailer to an art dealer.

With the second film another success, Associated Radio Pictures lured Wontner to their studio to make The Sign of Four: Sherlock Holmes' Greatest Case which was produced and released later the same year.

[5] For this film, Fleming was replaced by younger actor Ian Hunter to better facilitate the storyline of Watson's wooing of Mary Morstan.

Ian Fleming returned for a final turn at Dr. Watson, as did Lyn Harding as Moriarty while John Turnbull became the third actor to play Inspector Lestrade.

"[12] Wontner's final performance as Sherlock Holmes was in a 1943 BBC adaptation of "The Boscombe Valley Mystery" with Carleton Hobbs as Dr.