DR. RANTZAU — pondered a problem. He knew that when Belgium and Holland were overrun, as soon they would be, it would be the end of Arthur Owens’s easy cross-Channel excursions. Yet DER KLEINER — the LITTLE GUY — was irreplaceable. Not only had he been the first to alert the Abwehr to British advances in radar, and to the existence of Britain’s coastal radar network, but Ritter could mentally check off many other accomplishments:He reported on ship movements, RAF concentrations of aircraft in England and France, the delivery of war materials from the United States, the strengthening of coastal defences, the disposition of balloon barrages, the formation of merchant vessel convoys, the camouflaged locations of fuel dumps. He also gave daily weather reports, often both morning and evening….1Owens had been head and shoulders above all other spies for three good reasons: he was inside British intelligence as a trusted double agent; he was allowed to travel Britain unsupervised; and MI5 accepted in principle that a double agent could be allowed solo visits to the Continent to confer with his German masters.
