Mercury Mystery paperback 110 (1947)

(thanks to Jo Travis for the picture)

Synopsis:
Introduction by Ellery Queen (the same introduction appears in Carr's essay The Grandest Game in the World)

The Adventures of Dr. Fell

The Proverbial Murder
The Locked Room
The Wrong Problem
The Hangman Won't Wait
A Guest in the House

And Other Stories

The Devil in the Summer House
Will You Walk Into My Parlor?
Strictly Diplomatic