The Golden Age of Detective Fiction was an era of classic murder mystery novels of similar patterns and styles, predominantly in the 1920s and 1930s. The Golden Age proper is, in practice, usually taken to refer to a type of fiction which was predominant in the 1920s and 1930s but had been written since at least 1911 and is still being written today. In his history of the detective story, Bloody Murder: From the Detective Story to the Crime Novel, the author Julian Symons heads two chapters devoted to the Golden Age as "the Twenties" and "the Thirties". Symons notes that Philip Van Doren Stern's article, "The Case of the Corpse in the Blind Alley" (1941) "could serve ... as an obituary for the Golden Age."Authors Agatha Christie, Dorothy L. Sayers, Margery Allingham and Ngaio Marsh have been collectively called the Queens of Crime. Source: Wikipedia (en)