THE RED HOUSE MYSTERY is a Whodunit mystery novel, published in 1922. It was Milne's only mystery novel and was immediately popular; Alexander Woollcott called it one of the three best mystery stories of all time , and Raymond Chandler, in his 1944 essay The Simple Art of Murder called it an agreeable book, light, amusing in the Punch style, written with a deceptive smoothness that is not as easy as it looks.