She had heard nothing more, though she frequently paused to hold her breath and await a further sound. It was wholly absurd, she told herself, for her heart to pound so madly. Just there to the brink, past those few large stones and shadows, and she would probably hear some slopping of the waves that would quiet her liveliest suspicion. Despite her utmost efforts, however, she could not stand upright as she went, and she could not continue quite to the edge without one or two more pauses to catch her breath that would not come calmly to her lips. But she forced herself all the way--save just the final cautious edging to the scarp, where she suddenly knelt and leaned a little forward. She was still a bit short of the brink, but remained where she was to calm her heart and listen. She could hear the water plainly. She felt entitled to arise and hasten back to Sidney--since of course there was nothing further to be heard. But, before she could gather the strength to rise, a series of short, percussive sounds all but froze the core of her heart--so much did it seem like someone heavily panting. Then, as she sat there staring helplessly at the jagged edge, four dark things--four fingers--crept actively over the lip of the wall--and a face abruptly followed, with a knife between its teeth! "Sidney!" she cried, and, madly thrusting the stick she had brought against the dark and hideous countenance, she arose and fled wildly from the place. CHAPTER XXXI THE SILENT VISITORS Grenville came running across the rock-strewn terrace as if guided by superinstinct. He fancied a sound like a heavy splash arose from the base of the shadowy wall, and momentarily sickened to the bottom of his soul with the thought that Elaine had fallen over. He saw her darting towards him a moment later, however, and caught her protectingly in his arms as she stumbled on a rock and plunged headlong against his breast. She instantly regained her foothold and clung to his arm, brokenly stammering her story and facing back the way she had come to show where the loathsome apparition had appeared above the brink. Sidney hastened there at once, armed only with a stone. Elaine, in a violent tremble, stood a few feet only away, having followed in unabated dread. Not another sound could Grenville detect as he leaned above the precipitous plunge attempting to pierce through the shadows and gloom, as he watched for some movement below. Whether the man had fallen backward from the lip, to go hurtling down through the darkness, or whether he had accomplished some swift and silent retreat, Sidney had no means of ascertaining. Only the ceaseless lap of the tide made a whisper in the air. He arose and returned to Elaine. "I had no idea the cliff was scalable," he told her, quietly. "I doubt if that means of spying will be attempted again---- It was a beastly way of showing their intentions towards us, but I'm glad to know what to expect."