The Detection Club was formed in 1930 by a group of British mystery writers, including Agatha Christie, Dorothy L. Sayers, Ronald Knox, Freeman Wills Crofts, Arthur Morrison, John Rhode, Jessie Rickard, Baroness Emma Orczy, R. Austin Freeman, G. D. H. Cole, Margaret Cole, E. C. Bentley, Henry Wade, and H. C. Bailey. Anthony Berkeley was instrumental in setting up the club, and the first president was G. K. Chesterton. There was a fanciful initiation ritual with an oath probably written by either Chesterton or Sayers, and the club held regular dinner meetings in London.
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Guidelines
In addition to meeting for dinners and helping each other with technical aspects in their individual writings, the members of the club agreed to adhere to a code of ethics in their writing to give the reader a fair chance at guessing the guilty party. These fair-play "rules" were summarised by one of the members, Ronald Knox, in an introduction to an anthology of detective stories. They were never intended as more than guidelines, and not all the members took them seriously. See history of crime fiction for details. The first American member (though then living in the UK) was John Dickson Carr, elected in 1936.
The club continues to exist, although the fair-play rules have been considerably relaxed.
A number of works were published under the club's sponsorship; most of these were written by multiple members of the club, each contributing one or more chapters in turn. In the case of The Floating Admiral, each author also provided a sealed "solution" to the mystery as he or she had written it, including the previous chapters. This was done to prevent a writer from adding impossible complications with no reasonable solution in mind. The various partial solutions were published as part of the final book.
The oath
Do you promise that your detectives shall well and truly detect the crimes presented to them using those wits which it may please you to bestow upon them and not placing reliance on nor making use of Divine Revelation, Feminine Intuition, Mumbo Jumbo, Jiggery-Pokery, Coincidence, or Act of God?
Presidents
Lord Gorell shared the presidency with Agatha Christie, who only agreed to accept the role if a co-president was appointed to conduct the club's proceedings.