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In page The Hound of the Baskervilles:

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The novel incorporates five plots: the ostensible 'curse' story, the two red-herring subplots concerning Selden and the other stranger living on the moor, the actual events occurring to Baskerville as narrated by Watson, and the hidden plot to be discovered by Holmes. The structure of the novel starting and ending in the familiar setting in London is used to ‘delimit the uncanny world associated with the Gothic landscape of the moors', with varying degrees of success.[1] Doyle wrote[citation needed] that the novel was originally conceived as a straight 'Victorian creeper' in the style of Le Fanu, with the idea of introducing Holmes as the deus ex machina arising only later.