“The mystery story is a kind of writing that need not dwell in the shadow of the past and owes little if any allegiance to the cult of the classics. It is a good deal more than unlikely that any writer now living will produce a better historical novel than Henry Esmond, a better tale of children than The Golden Age, a sharper social vignette than Madame Bovary, a more graceful and elegant evocation than The Spoils of Poynton, a wider and richer canvas than War and Peace or The Brothers Karamazov. But to devise a more plausible mystery than The Hound of the Baskervilles or The Purloined Letter should not be too difficult. Nowadays it would be rather more difficult not to.”

Introduction
The Simple Art of Murder (1950)