Guilty but Insane :

Guilty But Insane takes an historical approach to golden age detective fiction by Margery Allingham, Christianna Brand, Agatha Christie, Dorothy L. Sayers, and Gladys Mitchell. It examines how writers and readers of detective fiction during the 1920s to 1940s understood guilt, responsibility, and the workings of the mind as they related to the commission, the investigation, and the punishment of crime. Under the lens of psychology, the detective novel is revealed as a site for the negotiation of competing interpretations of sanity and insanity.--Provided by publisher.