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,
Agatha Christie's Poirot character with the surname Lemesurier, as a nod to the short story "The Lemesurier Inheritance", which has otherwise not been included in the Poirot series. One other short story, "The Regatta Mystery", is not included in the Suchet series, as it is not generally considered part of the Poirot canon. First published in issue 546 of the Strand Magazine in June 1936 under the title "Poirot and the Regatta Mystery" (and illustrated by Jack M. Faulks), the story was later rewritten by Christie to change the detective from Hercule Poirot to Parker Pyne. It was as a Parker Pyne mystery