Hercule Poirot met his lifelong friend, Captain Arthur Hastings, and solved the first of his cases to be published, "The Mysterious Affair at Styles". It is clear that Hastings and Poirot are already friends when they meet in Chapter 2 of the novel, as Hastings tells Cynthia that he has not seen him for "some years". Particulars such as the date of 1916 for the case and that Hastings had met Poirot in Belgium, are given in "Curtain: Poirot's Last Case", Chapter 1. After that case, Poirot apparently came to the attention of the British secret service and undertook cases for the
Hercule Poirot "little grey cells". Poirot also bears a striking resemblance to A. E. W. Mason's fictional detective, Inspector Hanaud of the French Sûreté, who first appeared in the 1910 novel "At the Villa Rose" and predates the first Poirot novel by ten years. Unlike the models mentioned above, Christie's Poirot was clearly the result of her early development of the detective in her first book, written in 1916 and published in 1920. His Belgian nationality was interesting because of Belgium's occupation by Germany, which also provided a plausible explanation of why such a skilled detective would be out of work and