In attempting to reach the genuine psychological reason for the popularity of detective stories, it is necessary to rid ourselves of many mere phrases. It is not true, for example, that the populace prefer bad literature to good, and accept detective stories because they are bad literature. The mere absence of artistic subtlety does not make a book popular. Bradshaw's Railway Guide contains few gleams of psychological comedy, yet it is not read aloud uproariously on winter evenings. If detective stories are read with more exuberance than railway guides, it is certainly because they are more artistic. Many good books have fortunately been popular; many bad books, still more fortunately, have been unpopular. A good detective story would probably be even more popular than a bad one. The trouble in this matter is that many people do not realize that there is such a thing as a good detective story; it is to them like speaking of a good devil. To write a story about a burglary