The Sign of the Four, also called The Sign of Four, is an 1890 detective novel, the second novel featuring Sherlock Holmes by British writer Sir Arthur Conan Doyle. Doyle wrote four novels and 56 short stories featuring the fictional detective.

Arthur Conan Doyle: La Marque des quatre (French language, 1896, Hachette)
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The Sign of the Four, also called The Sign of Four, is an 1890 detective novel, the second novel featuring Sherlock Holmes by British writer Sir Arthur Conan Doyle. Doyle wrote four novels and 56 short stories featuring the fictional detective.
French language
Published 1896 by Hachette.