Ngaio Marsh was, among other things, a well-respected theatrical producer (having started out as an actress), and her passion for and knowledge of the theater was displayed in many of Alleyn’s adventures. In Enter a Murderer, the Inspector has been invited to an opening night, a new play in which two characters quarrel and then struggle for a gun, with predictably sad results. Even sadder, the gun was not, in fact, loaded with blanks.