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The Mazarin Stone

"The Adventure of the Mazarin Stone"
Author Arthur Conan Doyle
Series The Case-Book of Sherlock Holmes
Publication date 1921

"The Adventure of the Mazarin Stone" (1921) is one of 12 Sherlock Holmes short stories (56 total) by Arthur Conan Doyle in The Case-Book of Sherlock Holmes first published Strand Magazine October 1921 - April 1927.

Watson arrives at 221B Baker Street where the page boy Billy shows him a wax effigy of Holmes placed near a curtained window in the sitting room. The effigy produces a shadow on the curtain that, when viewed from outside, is the unmistakable profile of Sherlock Holmes. Using this visual trick, Holmes aims to give a perfect target to a would-be murderer with a rifle. Holmes names his murderer as Count Negretto Sylvius, the diamond thief he has been following in disguises. He gives the criminal's address to Watson, then sends the doctor out the back for the police. As the Count arrives, Holmes has Billy invite him inside, then takes him by surprise when he attempts an assault on the effigy. Holmes then offers the Count and his helper, boxer Sam Merton, freedom if they give up the jewel, or jail if not.

He invites them to discuss the deal while he plays violin in the next room. When the Count decides to double-cross Holmes and takes the stone from his secret pocket to show Sam in window light, the detective springs from the chair in place of his replica and grabs the £100K jewel. His bedroom has a gramophone and secret passage to behind the curtain.

After the police take away the villains, Lord Cantlemere sweeps in. Unlike the Prime Minister and Home Secretary, he did not want Holmes. When tricked into insisting on arrest for whoever is found possessing the diamond, he finds the jewel in his pocket - where Holmes has placed it - and apologizes. Finally, Holmes can eat.

It is notable for being one of only two Arthur Conan Doyle Holmes stories, aside from a couple of humorous vignettes, to be written in third person. The other is "His Last Bow". "The Mazarin Stone" was written this way because it was adapted from a stage play, "The Crown Diamond", in which Watson hardly appeared. Its adaptation from the theatre also explains why the action in this story is confined to one room. The plot twist in which Holmes reveals he had been listening to the two criminals as they spoke freely would also not have been possible using a first person narrative.


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