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It is also one of the 12 best works by A. Conan Doyle about the genius detective Sherlock Holmes.

1891. Sherlock Holmes stumbles upon the trail of a mysterious international criminal organisation run by the «Napoleon of the underworld» Professor Moriarty. Holmes stubbornly and ingeniously leads the case to the exposure of the criminal syndicate. However, the detective realises that this case may be his last investigation. The final act of The Last Case is a duel between Holmes and Moriarty near the Reichenbach Falls in Switzerland.