He was up the side of the boat-like structure in a second, and then, with one leg thrown over the car he turned and took deliberate aim at Pu-Yi. There was one crack, he waited for an instant to be sure, and saw that it was enough. Then there was a chunk of machinery, two or three loud explosions, a roar, and the wings of the venomous night-hawk moved rapidly over the parquet, chased by a black shadow. It gathered speed, lifted, tilted upwards, and, clearing the buildings at the far end of the Square, hummed away into the night. * * * * * It was thus that Mark Antony Midwinter escaped from the City in the Clouds. He had been there all the time. He had murdered poor old Chang many hours before, and impersonated him with complete success. The food of the recluse was brought to him by servants and placed in an outer room so that he should never be disturbed during his calculations. He had received it with his usual muttered acknowledgments through a little _guichet_ in the wooden partition which separated the anteroom from the telescope chamber itself. No one had ever thought of doubting that the astronomer himself was there as usual. The whole thing was most carefully planned beforehand with diabolic ingenuity and resource. CHAPTER FIFTEEN It was just three weeks after the murder of Pu-Yi, and once more I sat in my chambers in Piccadilly. The day had been cloudy, and now, late in the afternoon, a heavy fog had descended upon the town through which fell a cold and intermittent rain. Up there, in the City in the Clouds, perhaps the sun was pouring down upon its spires and cupolas, but London, Piccadilly, was lowering and sad. Lord Arthur Winstanley and Captain Pat Moore had just left me, both of them glum and silent. It went to my heart not to take them into my full confidence, but to do so was impossible. I had told them much of the recent events in the City--I could not tell them everything, for they would not have understood. Certainly I could have relied upon their absolute discretion, but, in view of what was going to happen that very night, I was compelled to keep my own counsel. They had not lived through what I had recently. Their minds were not tuned, as mine was, to the sublime disregard and aloofness from English law which obtained in Morse's gigantic refuge. Certainly neither of them would have agreed to what I proposed to do that night. Preston came quietly into the library. He pulled the curtains and made up the fire. The face of Preston was grim and disapproving. He looked much as he looked when--what ages ago it seemed!--I departed his comfortable care to become the landlord of the "Golden Swan." "I'm not at home to any one, Preston," I said, "except to Mr. Sliddim, who ought to be here in a few minutes. Of course, that doesn't apply to Mr. Rolston."