Definition: The Detection Club was a British society formed in the 1930s, which has continued, in various forms, until the present day. Members included Dorothy L. Sayers, G.K. Chesterton, Agatha Christie, and Ronald Knox. In addition to discussing the writing of mysteries, or crime stories, they agreed to abide by a code of ethics.
Interested in an organization for mystery writers of today? Mystery Writers of America serves mystery and crime writers with information on craft and publishing.