"The Devil in the Summer House" was written by "locked-room" mystery author John Dickson Carr and originally aired as an hour long program on BBC radio on October 14, 1940. (There does not appear to be a recording of that broadcast available.) Carr re-wrote the story as a half-hour program for Suspense but excluded the character of Dr. Gideon Fell, a sleuth who appears in many of Carr's novels. The short story of the version that aired on Suspense can be found in Ellery Queen's Mystery Magazine, September 1946.
As the episode opens, two men meet on the grounds of an uninhabited home on a dark and stormy night. Twenty-five years earlier, the summer house behind the garden was the scene of a death. Now, it is all grown over...
Joe Parker, an attorney, and Captain Burke of the homicide squad, enter the old house. Mr. Parker was the attorney for the family that lived here, and he has come back now because he recently received a letter from someone...who must surely now be dead.
But, why would a dead person send him a letter?
(Image of Martin Gabel)