They crossed the dark landing, avoiding with their eyes the deep black space over the banisters. Then they began to mount the narrow staircase to meet the sounds which, minute by minute, grew louder and nearer. About half-way up the stairs Aunt Julia stumbled and Shorthouse turned to catch her by the arm, and just at that moment there came a terrific crash in the servants' corridor overhead. It was instantly followed by a shrill, agonised scream that was a cry of terror and a cry for help melted into one. Before they could move aside, or go down a single step, someone came rushing along the passage overhead, blundering horribly, racing madly, at full speed, three steps at a time, down the very staircase where they stood. The steps were light and uncertain; but close behind them sounded the heavier tread of another person, and the staircase seemed to shake. Shorthouse and his companion just had time to flatten themselves against the wall when the jumble of flying steps was upon them, and two persons, with the slightest possible interval between them, dashed past at full speed. It was a perfect whirlwind of sound breaking in upon the midnight silence of the empty building. The two runners, pursuer and pursued, had passed clean through them where they stood, and already with a thud the boards below had received first one, then the other. Yet they had seen absolutely nothing--not a hand, or arm, or face, or even a shred of flying clothing. There came a second's pause. Then the first one, the lighter of the two, obviously the pursued one, ran with uncertain footsteps into the little room which Shorthouse and his aunt had just left. The heavier one followed. There was a sound of scuffling, gasping, and smothered screaming; and then out on to the landing came the step--of a single person _treading weightily_. A dead silence followed for the space of half a minute, and then was heard a rushing sound through the air. It was followed by a dull, crashing thud in the depths of the house below--on the stone floor of the hall. Utter silence reigned after. Nothing moved. The flame of the candle was steady. It had been steady the whole time, and the air had been undisturbed by any movement whatsoever. Palsied with terror, Aunt Julia, without waiting for her companion, began fumbling her way downstairs; she was crying gently to herself, and when Shorthouse put his arm round her and half carried her he felt that she was trembling like a leaf. He went into the little room and picked up the cloak from the floor, and, arm in arm, walking very slowly, without speaking a word or looking once behind them, they marched down the three flights into the hall.