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 often misleading about his past to gain information, the truthfulness of that statement is unknown; it does however scare off a would be killer of his wife. In the short story "The Chocolate Box" (1923), Poirot reveals to Captain Arthur Hastings an account of what he considers to be his only failure. Poirot admits that he has failed to solve a crime "innumerable" times: I have been called in too late. Very often another, working towards the same goal, has arrived there first. Twice I have been struck down with illness just as I was on the point of success.