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After reading 1540 websites, we found 2 different results for "Who wrote The Sign of Four"
Arthur Conan Doyle
Arthur Conan Doyle wrote The Sign of Four which was published in the magazine in February 1890.
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featuring Sherlock Holmes written by Sir Arthur Conan Doyle
The Sign of the Four, also called The Sign of Four, is the second novel featuring Sherlock Holmes written by Sir Arthur Conan Doyle.
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