Hercule Poirot available to solve mysteries at an English country house. At the time of Christie's writing, it was considered patriotic to express sympathy towards the Belgians, since the invasion of their country had constituted Britain's "casus belli" for entering World War I, and British wartime propaganda emphasised the "Rape of Belgium". Poirot first appeared in "The Mysterious Affair at Styles" (published in 1920) and exited in "Curtain" (published in 1975). Following the latter, Poirot was the only fictional character to receive an obituary on the front page of "The New York Times". By 1930, Agatha Christie found Poirot "insufferable", and, by
Hercule Poirot in literature story years (25 short stories and only 4 novels). Christie increased her novel production during this time (14 novels, 21 total short stories and one theatre play). Twelve short stories form "The Labours of Hercules". The other short stories listed here take place in this period but were published before and after the publication of "Hercules". The theatre play is named "Black Coffee" and was written by Agatha Christie, who stated a frustration with other stage adaptations of her Poirot mysteries. In 1998, author Charles Osborne adapted the play into a novel. A new detective, Miss Marple, enters the stage