In 1927, Arthur Conan Doyle was asked by Strand Magazine of London to provide a list of the twelve best Sherlock Holmes short stories.
When this competition was first mooted I went into it in a most light-hearted way, thinking that it would be the easiest thing in the world to pick out the twelve best of the Holmes stories. In practice I found that I had engaged myself in a serious task. - Arthur Conan DoyleLater, Doyle added seven more best Sherlock Holmes short stories to his list from those written after 1927. - AsNotedIn
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