A forgotten 1890 first edition of Sherlock Holmes novel The Sign of Four arrived among ordinary charity-shop donations in England; staff spotted its significance and it sold for £11,520

https://timesofindia.indiatimes.com/world/uk/a-forgotten-1890-first-edition-of-sherlock-holmes-novel-the-sign-of-four-arrived-among-ordinary-charity-shop-donations-in-england-staff-spotted-its-significance-and-it-sold-for-11520/articleshow/135117224.cms

The Sign of the Four at PG: https://www.gutenberg.org/ebooks/2097

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