"I see the detective story as a subspecies of the crime novel. The crime novel can include a remarkable variety of works from the cosy certainties of Agatha Christie, through Anthony Trollope and Graham Greene, to the great Russians. The detective story may be considered more limited in scope and potential. The reader can expect to find a central mysterious death, a closed circle of suspects each with credible motive, means and opportunity for the crime, a detective, either amateur or professional, who comes in like an avenging deity to solve it , . . . - P. D. James, http://bit.ly/7ztC9m
