Agatha Christie Before marrying and starting a family in London, she had served in a Devon hospital during the First World War, tending to troops coming back from the trenches. She was initially an unsuccessful writer with six consecutive rejections, but this changed when "The Mysterious Affair at Styles", featuring Hercule Poirot, was published in 1920. During the Second World War, she worked as a pharmacy assistant at University College Hospital, London, acquiring a good knowledge of poisons which feature in many of her novels. "Guinness World Records" lists Christie as the best-selling novelist of all time. Her novels have sold roughly
The Regatta Mystery short story." An unnamed reviewer in the "Toronto Daily Star" (30 June 1939) wrote, regarding the title story "The Regatta Mystery", that "Agatha Christie succeeds in baffling her readers ... [B]ut far from plausible is her solution", and went on generally to say, "The author is handicapped by attempting to compress her plots into 27-odd pages each. Nor has she opportunity for continued suspense." The original version of "The Regatta Mystery" featured Hercule Poirot. The story was later rewritten by Christie to change the detective from Poirot to Parker Pyne for book publication and all collections in both the US