It is Sunday afternoon, preferably before the war. The wife is already asleep in the armchair, and the children have been sent out for a nice long walk. You put your feet up on the sofa, settle your spectacles on your nose, and open the News of the World. Roast beef and Yorkshire, or roast pork and apple sauce, followed up by suet pudding and driven home, as it were, by a cup of mahogany-brown tea, have put you in just the right mood. Your pipe is drawing sweetly, the sofa cushions are soft underneath you, the fire is well alight, the air is warm and stagnant. In these blissful circumstances, what is it that you want to read about? Naturally, about a murder.