Detection is, or ought to be, an exact science and should be treated in the same cold and unemotional manner. You have attempted to tinge it with romanticism, which produces much the same effect as if you worked a love-story or an elopement into the fifth proposition of Euclid.

Arthur Conan Doyle (1859-1930) British writer and physician

Story (1890-02), “The Sign of the Four,” ch. 1 [Holmes], Lippincott’s Monthly Magazine, Vol. 45 (US) / 1 (UK)
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Critiquing Watson's writing in A Study in Scarlet (1887). More on Euclid's Fifth Proposition here.

The original publication, and Doyle's manuscript (along with many other iterations across media) use "The Sign of the Four" as the title, while others (including the first book publications) use "The Sign of Four." The five-word form is used most commonly in the story, but the four-word form does show up. (More info.)

Published in novel form as The Sign of Four (1890-10).