Roy Irons' fascinating book investigates whether Hitler's campaign would have been a greater success if he had put fewer resources into experimental weapons of revenge such as the V-2 rocket and the V-1 Doodle-bug. Enormous resources were poured into these experimental projects, often inspired by Hitler's thirst for revenge after the collapse of Germany in 1918 and his dread of a recurrence when Russian victories and allied bombing began to cast grim and ever-growing shadows over the Third Reich.