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 to kill his victim shortly before his own death so that he could avoid succumbing to the arrogance of the murderer, concerned that he might come to view himself as entitled to kill those whom he deemed necessary to eliminate. The "murderer" that he was hunting had never actually killed anyone, but he had manipulated others to kill for him, subtly and psychologically manipulating the moments where others desire to commit murder so that they carry out the crime when they might otherwise dismiss their thoughts as nothing more than a momentary passion. Poirot thus was forced to kill the