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
