The Sign of Four (1932 film) - Wikipedia
The 100 best novels: No 26 – The Sign of Four by Arthur Conan Doyle (1890) | Arthur Conan Doyle | The Guardian
The Sign of Four (TV Movie 1987) - IMDb
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Sherlock Holmes: The Sign of Four
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The Sign of Four - Rotten Tomatoes
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Charles van Buren's review of A Study in Scarlet and The Sign of Four
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Sherlock Holmes and the Sign of Four (TV Movie 1983) - IMDb
The Sign of Four (TV Movie 1983) - IMDb
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The Sign of Four - The Arthur Conan Doyle Encyclopedia
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Sherlock Holmes – “The Sign of Four” The Sherlock Holmes Society of London
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The Sign of Four - Broadview Press
