Click--click--click! The long letter T repeated three times. Then a pause, and the call "M.X.Q.Q.--J.A.J.70." By the prefix, Rodwell knew that he was "through," and actually in communication with the headquarters of the German espionage throughout the world; that marvellously alert department from which no secret of state, or of hostile army or navy was safe; the department formed and controlled by the great Steinhauer, who had so many times boasted to him, and perhaps with truth, that at the Koeniger-gratzerstrasse they knew more of England than even the English themselves knew. True, the British public will never be able to realise one hundredth part of what Germany has done by her spy-system, or of the great diplomatic and military successes which she has achieved by it. Yet we know enough to realise that for years no country and no walk of life-- from the highest to the lowest--has been free from the ubiquitous, unscrupulous and unsuspected secret agents of whom Lewin Rodwell was a type. In Germany's long and patient preparation for the world-war, nothing in the way of espionage was too large, or too small for attention. The activity of her secret agents in Berlin had surely been an object-lesson to the world. Her spies swarmed in all cities, and in every village; her agents ranked among the leaders of social and commercial life, and among the sweepings and outcasts of great communities. The wealthiest of commercial men did not shrink from acting as her secret agents. She was not above employing beside them the very dregs of the community. No such system had ever been seen in the world. Yet the benefits which our enemies were deriving from it, now that we were at war, were incalculable. By every subtle and underhand means in her power, Germany had prepared for her supreme effort to conquer us, and, as a result of this it was that Lewin Rodwell that night sat at the telegraph-key of the Berlin spy-bureau actually established on British soil. He waited until the call had been repeated three times with the secret code-number of the Koeniger-gratzerstrasse, namely: "Number 70 Berlin." Then, putting out his cigarette, he drew his chair forward until his elbows rested upon the table, and spreading out the closely-written document before him, tapped out a signal in code. The letters were "F.B.S.M." To this kind of pass-word, which was frequently altered from time to time, he received a reply: "G.L.G.S." and then he added his own number, "0740." The signals exchanged were quite strong, and he drew a long breath of relief and satisfaction. Then, settling down to his dastardly work, he began to tap out rapidly the following in German: "On Imperial War Service. Most Urgent. From 0740 to Berlin 70. Transmitted Personally.