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The book features the recurring character of Colonel Race for the last time and was an expansion of a Hercule Poirot short story entitled "Yellow Iris," which had previously been published in issue 559 of the Strand Magazine in July 1937 and in book form in The Regatta Mystery and Other Stories in the US in 1939.
The Man in the Brown Suit is perhaps the only novel in which the emotional side of Colonel Race's nature has been given consideration.