Hercule Poirot sort of obsessive-compulsive" in Poirot. As mentioned in "Curtain" and "The Clocks", he is fond of classical music, particularly Mozart and Bach. In "The Mysterious Affair at Styles", Poirot operates as a fairly conventional, clue-based and logical detective; reflected in his vocabulary by two common phrases: his use of "the little grey cells" and "order and method". Hastings is irritated by the fact that Poirot sometimes conceals important details of his plans, as in "The Big Four". In this novel, Hastings is kept in the dark throughout the climax. This aspect of Poirot is less evident in the later novels,
Poirot Investigates hidden in the house; he agrees to look. Poirot and Hastings travel to Devon, where they are looked after by Mr and Mrs Baker, Marsh's housekeepers. They tell Poirot that they signed and witnessed two wills, as Marsh said he had made a mistake with the first, although they did not see its contents. Immediately afterwards, Marsh left the house to settle tradesmen's accounts. Looking round the house, Poirot is pleased with the dead man's order and method, except for one particular: the key to a roll top desk has been affixed, not to a neat label, but instead to