Fan Casting Arthur Hastings in The Mysterious Affair at Styles

Captain Arthur Hastings is the narrator of the novel. He ends up at Styles Court after a brief stint in a convalescent home, recovering from injuries he sustained during WWI, which is still ongoing during the events of the novel. Hastings fancies himself an amateur sleuth, but he is extremely insecure about his investigatory prowess and desperate for the approval of Hercule Poirot. Hastings is infatuated with Mary Cavendish, his friend John's wife.