The Valley of Fear - Arthur Conan Doyle

The last of the four book-length Sherlock Holmes stories pads out an interesting Holmes investigation of a murder in a country house with a lengthy back story set in the USA. Both parts of the book keep the reader interested in the twists and turns of the plot, with a final twist as the two parts are reconciled towards the end. I think the Holmes formula worked best in the shorter stories and in truth we don't get much more than a short story's worth of Holmes here but that doesn't mean this isn't a good read and a worthy member of the canon.

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