Penguin Books, London. 1971, paperback, Mystery fans who have been following the famous Nicky Welt stories will be enchanted with this harvest of ingenious puzzles starring the smart professor who solves murders left & right just by raising an eyebrow. Includes The nine mile walk; The straw man; The ten o'clock scholar; End play; Time and time again; The whistling tea kettle; The bread and butter case; The man on the ladder.