“The Sign of Four” is a 1932 black & white British Crime/Mystery film directed by Graham Cutts and staring Ian Hunter, Arthur Wontener, Ilsa Bevin, Graham Soutton and Miles Malleson in which a young woman needs Sherlock Holmes for protection when she’s tormented by an escaped killer. However, when the woman is abducted, Holmes and Watson must infiltrate the city’s criminal underworld to track down the young woman.
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- Sir Arthur Conan Doyle: The Doctor and the Detective: A Biography of Sir Arthur Conan Doyle by Martin Booth
- Teller of Tales: The Life of Sir Arthur Conan Doyle by Daniel Stashower
- Alfred Hitchcock: Hitchcock (Revised Edition) by Francois Truffaut and Helen Scott
- Alfred Hitchcock: A Life in Darkness and Light by Patrick McGilligan