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In the short story The Adventure of the Dartmoor Bungalow (later, chapters 3 and 4 of The Big Four), Halsey is mentioned by John Ingles. He would appear to be a mutual friend of Ingles and Poirot. He had, it seemed, provided a letter of introduction for Poirot to Ingles when Poirot needed to consult him for background information on Li Chang Yen.

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