The Final Problem is a short story by Arthur Conan Doyle featuring his detective character Sherlock Holmes. It was first published in Strand Magazine in December 1893. It appears in book form as part of the collection The Memoirs of Sherlock Holmes. Conan Doyle later ranked "The Final Problem" fourth on his personal list of the twelve best Holmes stories.
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Conan Doyle was also 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.