Hercule Poirot of Police of Brussels, until "the Great War" (World War I) forced him to leave for England. (In "The Mysterious Affair at Styles" Poirot had retired at age 55 in 1905) I had called in at my friend Poirot's rooms to find him sadly overworked. So much had he become the rage that every rich woman who had mislaid a bracelet or lost a pet kitten rushed to secure the services of the great Hercule Poirot. During World War I, Poirot left Belgium for England as a refugee (although he returned a few times). On 16 July 1916 he again
Hercule Poirot behind as a "very unhappy old man". However, Poirot and Hastings reunite during the novels "The Big Four", "Peril at End House", "The ABC Murders", "Lord Edgware Dies" and "Dumb Witness" when Hastings arrives in England for business, with Poirot noting in "ABC Murders" that he enjoys having Hastings over because he feels that he always has his most interesting cases with Hastings. The two collaborate for the final time in "Curtain: Poirot's Last Case", when the seemingly-crippled Poirot asks Hastings to assist him in his final case. When the killer they are tracking nearly manipulates Hastings into committing murder,