"This way!" said Torrence, stepping softly along the edge of the gutter in search of a suitable anchorage for the hook. But the place looked dangerous. There was an attic window hard by, which we must avoid, and the gutter flared too broadly for a holding. Fortunately there was plenty of rope, as the drop to the ground could not have been more than twenty feet. "Now don’t make a sound for your life. I am going to take a loop around the chimney. There is a blank wall where we must drop, but whole families are asleep beneath us. Follow me and hold your breath. If we can once gain the air ship we are safe!" It was the first intimation he had given of where we were going, and I was relieved to be assured that we were headed for our own property, though why we should be afraid to go there openly was the mystery. We passed the line around the chimney and made a loop with the hook, and then Torrence, grasping the rope firmly, disappeared over the edge into the alley below. I followed him as quickly as possible, but must have made more noise than I intended, for scarcely had I touched the ground than a window opened above me, and a man’s head was thrust out. "Hello, there!" he cried; and then seeing the rope, which was hanging in full view of the gaslight, shouted at the top of his voice: "Police! Stop thief! Police!" "Run for your life!" cried Torrence, "but don’t lose sight of me!" He led the way down the alley at a lively pace; I followed, though farther off than I liked. It was only a short distance to where a street crossed at right angles. Turning to the left we dashed down the thoroughfare at full speed, and before I had gone fifty yards, ran square into the arms of a policeman. "No so fast, young man!" said the officer, holding me firmly, "what’s all this about?" "What’s it about," I answered indignantly; "I’m trying to catch the thief, and there he is." I pointed to Torrence, who at that minute turned another corner, "and if you’d do your duty and help, instead of standing here holding me like an idiot, we’d have him!" I added. "And what’s he done?" asked the man stupidly, evidently mortified at his mistake. "Has he robbed you?" "I should say so. He’s grabbed my watch and chain and made away with it; and we’ll never get it back again either, if you keep me here much longer." The man released his hold. Fortunately my coat was buttoned up so that the chain was covered. The policeman had only got a glimpse of Torrence, who passed while he was on the opposite side of the street, but he was now convinced that he was in error and had caught the wrong man, and so joined me in the pursuit. Scarcely had we turned the corner after Torrence than we met that gentleman walking very leisurely toward us. "Did you see a fellow running this way?" asked the officer excitedly. "Yes," said my brother; "he’s just ahead of you! If you run I think you may catch him!"