Die All, Die Merrily: A Carolus Deene Mystery (Carolus Deene Series)

Richard Hoysden's body is discovered in his country flat, apparently a suicide. Missing from the room is a tape of Hoysden's last moments in which he confesses to the murder of a young woman. Lady Drombone, a Member of Parliament and the young man's aunt, hires Carolus to find the tape and help suppress it. He himself insists on reconstructing the confusing circumstances in order to solve the baffling crime.