A Study in Scarlet is a detective mystery novel written by Sir Arthur Conan Doyle, introducing his new characters, "consulting detective" Sherlock Holmes and his friend and chronicler, Dr. John Watson, who later became two of the most famous characters in literature.Conan Doyle wrote the story in 1886, and it was published the following year. The book's title derives from a speech given by Holmes to Doctor Watson on the nature of his work, in which he describes the story's murder investigation as his "study in scarlet": "There's the scarlet thread of murder running through the colourless skein of life, and our duty is to unravel it, and isolate it, and expose every inch of it."


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Conan Doyle was a fervent advocate of justice and personally investigated two closed cases, which led to two men being exonerated of the crimes of which they were accused. The first case, in 1906, involved a shy half-British, half-Indian lawyer named George Edalji who had allegedly penned threatening letters and mutilated animals. Police were set on Edalji's conviction, even though the mutilations continued after their suspect was jailed.

The second case, that of Oscar Slater, a German Jew and gambling-den operator convicted of bludgeoning an 82-year-old woman in Glasgow in 1908, excited Conan Doyle's curiosity because of inconsistencies in the prosecution case and a general sense that Slater was not guilty. He ended up paying most of the costs for Slater's successful appeal in 1928.