First Edition. pp. 288 illusts #0120 (Some foxing on prelims and edges; sunning.)

Admiralty agents Allied American arms attaché attack authorities base became Britain British Canaris Captain carried changed Chief cipher close Commander communications concerned craft deal deciphering Defence Department detection early effect enemy espionage established evidence experience fact Fleet force Foreign France Franklin French German Naval Intelligence given Hall hand head highly important intercepted interest island Italy Japanese keep knew known later learned letter London Lord messages missile months naval intelligence never North nuclear obtained Ocean officers operation ordered organization passed period plans political ports possible powers probably problem received records reports result Room Royal Navy Russians secret sent Service ships side signals Soviet story submarine success suggested taken tion took U-boat