Captain Arthur J. M. Hastings, OBE, is a fictional character created by Agatha Christie as the companion-chronicler and best friend of the Belgian detective, Hercule Poirot. He is first introduced in Christie's 1920 novel The Mysterious Affair at Styles (originally written in 1916) and appears as a character in seven other Poirot novels, including the final one Curtain: Poirot's Last Case (1975), along with a play and many short stories. He is also the narrator of several of them. Source: Wikipedia (en)