"thirteen in number" [HOUN] Ask the average citizen about the number thirteen, and it is likely to inspire terror, or at least some slight trepidation. Right up there with black cats and overturned saltshakers, the number thirteen has a long history associated with bad luck. But what about in the Sherlock Holmes stories? Where does the number thirteen pop up and what can we infer from it? It's just a Trifle.

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Music credits Performers: Uncredited violinist, US Marine Chamber Orchestra Publisher Info.: Washington, DC: United States Marine Band. Copyright: Creative Commons Attribution 3.0