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
Poirot Investigates for the purposes of fiction, had been almost exhausted. Miss Agatha Christie, however, has invested the type with a new vitality in her Hercule Poirot, and in "Poirot Investigates" she relates some more of his adventures. Poirot is most things that the conventional sleuth is not. He is gay, gallant, transparently vain, and the adroitness with which he solves a mystery has more of the manner of the prestidigitator than of the cold-blooded, relentless tracker-down of crime of most detective stories. He has a Gallic taste for the dramatic, and in "The Tragedy of Marsdon Manor" he perhaps gives it