The Detection Club produced a number of collaborative ventures to boost its coffers. The earliest of these, in 1930, was Behind The Screen.  Broadcast on the BBV in six episodes, each read by the author, and also serialised in The Lustener, the mystery was written by Hugh Walpole, Agatha Christie, Dorothy L. Sayers, Anthony Berkelwy,  E. C. Bentley and Rinald Knox. An abridged version, adapted by Jihn Peacock, last broadcast in 2015, is currently being rebroadcast by the BBC on Radio 4 Extra.  To listen to it, including the four episodes broadcast last week on the BBC Radio iplayer go to:

http://www.bbc.co.uk/programmes/b068b5jj