wife. Later, though, he tells Poirot to draw back and escape the trap. The two are an airtight team until Hastings meets and marries Dulcie Duveen, a beautiful music hall performer half his age, after investigating the Murder on the Links. They later emigrated to Argentina, leaving 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, Poirot describes this in his final farewell letter to Hastings as the catalyst that prompted him to eliminate the man himself, as Poirot knew that his friend was not a murderer and refused to let a man capable of manipulating Hastings in such a manner go on. Mrs Ariadne Oliver Detective novelist Ariadne Oliver is Agatha Christie's humorous self-caricature. Like Christie, she is not overly fond of the detective whom she is most famous for creating–in Ariadne's case, Finnish sleuth Sven Hjerson. We never learn anything about her husband, but we do know that she hates alcohol and public appearances and has a great fondness for apples until she is put off them by the events of Hallowe'en Party. She also has a habit of constantly changing her hairstyle, and in every appearance by her much is made of her clothes and hats. Her maid Maria prevents the public adoration from becoming too much of a burden on her employer but does nothing to prevent her from becoming too much of a burden on others. She has authored more than 56 novels and greatly dislikes people modifying her characters. She is the only one in Poirot's universe to have noted that "It’s not natural for five or six people to be on the spot when B is murdered and all have a motive for killing B." She first met Poirot in the story Cards on the Table and has bothered him ever since. Miss Felicity Lemon Poirot's secretary, Miss Felicity Lemon, has