The spy looked at the speaker helplessly. His white face contrasted sharply with his black moustache. For a moment he swayed uncertainly, and fell to the floor in a heap. He was a most abject spectacle, and it was necessary to carry him out of the room. That night he spent in a cell, facing a charge of treason against the Government, and wondering what his fate would be. A mass of compromising letters and papers were found in the room. From some of these it was proven that “G. D.” was a naturalized citizen and a former yeoman on the cruiser _Brooklyn_. What had prompted him to turn against his own country? Could it have been some grievance, real or fancied? Was it Spanish gold? Chief Wilkie discovered many interesting things among the papers that were found in the room on E Street. Among them was a slip of paper which contained what is known as Slater’s Code. It said: “To send add 100; to receive subtract 100.” This was the key to the cipher which he was to employ in sending messages to his employers. The cipher contained thousands of ordinary words arranged alphabetically and having fixed consecutive numbers of five figures each. Why he had not employed it in the compromising communication to Montreal was never known. Possibly over-confidence had made him careless for the moment. In the meantime Chief Wilkie had his organization working overtime. The United States map in his office containing the little steel pins to indicate the position of his men in different parts of the United States and Canada was consulted repeatedly during the next twenty-four hours. Telegrams in code were sent in all directions. As the result another spy was captured in Tampa, Florida. By one of the curious freaks of fate this man was critically ill when he was taken into custody and died shortly afterwards. But the greatest activity was in Canada. It was learned that the Dorchester Street house had only been leased a few days before, and that it was intended as the rendezvous of the Spanish spies in Canada. It was clear that a private detective agency had been organized in Canada for the purpose of obtaining information concerning the movements of the American troops.