With a last glance at the moonlit square, they passed quickly in, and the door slammed behind them with a roar that echoed prodigiously through empty halls and passages. But, instantly, with the echoes, another sound made itself heard, and Aunt Julia leaned suddenly so heavily upon him that he had to take a step backwards to save himself from falling. A man had coughed close beside them--so close that it seemed they must have been actually by his side in the darkness. With the possibility of practical jokes in his mind, Shorthouse at once swung his heavy stick in the direction of the sound; but it met nothing more solid than air. He heard his aunt give a little gasp beside him. "There's someone here," she whispered; "I heard him." "Be quiet!" he said sternly. "It was nothing but the noise of the front door." "Oh! get a light--quick!" she added, as her nephew, fumbling with a box of matches, opened it upside down and let them all fall with a rattle on to the stone floor. The sound, however, was not repeated; and there was no evidence of retreating footsteps. In another minute they had a candle burning, using an empty end of a cigar case as a holder; and when the first flare had died down he held the impromptu lamp aloft and surveyed the scene. And it was dreary enough in all conscience, for there is nothing more desolate in all the abodes of men than an unfurnished house dimly lit, silent, and forsaken, and yet tenanted by rumour with the memories of evil and violent histories. They were standing in a wide hall-way; on their left was the open door of a spacious dining-room, and in front the hall ran, ever narrowing, into a long, dark passage that led apparently to the top of the kitchen stairs. The broad uncarpeted staircase rose in a sweep before them, everywhere draped in shadows, except for a single spot about half-way up where the moonlight came in through the window and fell on a bright patch on the boards. This shaft of light shed a faint radiance above and below it, lending to the objects within its reach a misty outline that was infinitely more suggestive and ghostly than complete darkness. Filtered moonlight always seems to paint faces on the surrounding gloom, and as Shorthouse peered up into the well of darkness and thought of the countless empty rooms and passages in the upper part of the old house, he caught himself longing again for the safety of the moonlit square, or the cosy, bright drawing-room they had left an hour before. Then realising that these thoughts were dangerous, he thrust them away again and summoned all his energy for concentration on the present. "Aunt Julia," he said aloud, severely, "we must now go through the house from top to bottom and make a thorough search."