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 Hollow detective Hercule Poirot—one of the longest gaps in the entire series. Christie, who often admitted that she did not like Poirot (a fact parodied by her recurring novelist character Ariadne Oliver), particularly disliked his appearance in this novel. His late arrival, jarring, given the established atmosphere, led Christie to claim in her "" that she "ruined [her own novel] by the introduction of Poirot". Agatha Christie's successful career foresaw the use of her eight owned houses as settings for her novels, which were Taken at the Flood, Dead Man's Folly, Five Little Pigs, A Pocket Full of Rye, and Crooked