"Most probably," he said, "they have another station across at Borkum, Wilhelmshaven, or somewhere. I wonder what they're at?" he added, much puzzled. Through those long hours we watched anxiously; but just before the dawn Dubois and Busch lowered their apparatus from the top of the chimney, and a few minutes later emerged, walking together towards the hotel. As soon as they were out of sight we held a consultation, and it was decided that, while Murphy and I kept watch for the police, Ray should use his jemmy upon the door and break it open. He would admit us and remain himself outside to give us warning. Those moments were breathless ones. We parted, the wireless operator walking one way, while I went in the opposite direction. Suddenly we heard the cracking of wood, followed by a low cough. By that, we knew all was well. We hurried back, and a few seconds later were in the courtyard of the disused factory. Ray had handed me his jemmy, and with it I broke open the second door of the empty place, flashing a light with the electric torch I carried. We passed into the small office, but no second glance was needed to show that the place was completely fitted with a wireless installation of the most approved pattern. "We'll try it," suggested young Murphy, and taking out the apparatus we hauled it up to the top of the chimney. Then re-entering the office, he placed the receiver over his ears, and listened intently, in his hand a pencil he had found ready upon the paper pad. I stood watching his face. Apparently he heard nothing. Then he touched the key of the instrument and instantly a great blue spark, causing a crackling noise, flashed across the room. He was calling. Suddenly his face brightened, and he was listening. Then he grew greatly puzzled. Taking the receiver off his head he began to search the table upon which were several books; but at that instant I heard a light footstep behind me, and as I turned I felt a heavy crushing blow upon the top of my skull. Then the blackness of unconsciousness fell upon me. I knew no more till, on opening my eyes, I found myself lying in bed with a nurse bending over me. I gazed around in amazement. There were other beds in the vicinity. I was in a hospital with my head tightly bandaged. For a whole day and night I lay there, the nurse forbidding me to speak. Then suddenly there entered Ray, whose arm was in a sling, accompanied by young Murphy. "The spies came back--unexpectedly, and went for me before I could raise the alarm," Raymond explained. "Dubois hit you over the head with a jemmy, and by Jove! it's a mercy you weren't killed. He's cleared out of the country, however, fearing a charge of attempted murder. I've informed the police, and they are looking for both him and Busch, as well as Gessner, who is missing from Sydenham." "Yes, but why had they established these two wireless stations?" I asked.