Ask a Policeman — The Detection Club

With “a touch of genius,” this round-robin mystery follow-up to The Floating Admiral features famous detectives including Lord Peter Wimsey (The Times Literary Supplement).
 
Following the success of The Floating Admiral, in which certain members of the Detection Club -- including Agatha Christie, Dorothy L. Sayers, and G. K. Chesterton -- collaborated on a whodunit, six writers pooled their talents to create another coauthored mystery. This time the premise had an added twist: authors would swap their detective characters, allowing for some extremely entertaining parodies of one another's sleuths.
 
When a ruthless British newspaper tycoon is shot dead in his home, the high-level suspects include the assistant commissioner of Scotland Yard, casting doubt on the impartiality of a formal police investigation. As a solution, the home secretary brings in four brilliant detectives to solve the murder: Mrs. Bradley, Sir John Saumarez, Lord Peter Wimsey, and Roger Sheringham.
 
Featuring a preface by inaugural Detection Club member Agatha Christie, this playful tour de force gathers together half a dozen Golden Age Mystery masters: John Rhode, Helen Simpson, Gladys Mitchell, Anthony Berkeley, Dorothy L. Sayers, and Milward Kennedy.