The main aim of detective stories is to entertain, but the best cast a light on human behaviour and display both literary ambition and accomplishment. Even unpretentious detective stories, written for unashamedly commercial reasons, can give us clues to the past and give us insight into a long-vanished world that, for all its imperfections, continues to fascinate. This book, written by Martin Edwards, serves as a companion to the British Library’s internationally acclaimed series of Crime Classics.