Grenville consented to give her the watch till midnight. The island's wail in the late afternoon had seemed no fainter than that of the previous day. He was quite convinced there would be no night attack. Yet he stretched a cord across the trail that must pull at his arm and so give an alarm should anyone enter at his gate. Doubtless in this confidence he fell asleep with more than usual promptness. He was far more weary than he knew, and Nature demanded her dues. Elaine was glad he could slumber so profoundly. The night was barely cool; she was not in the least uncomfortable as she sat at Grenville's side. She knew he would waken at the slightest tug on the cord so quickly contrived to warn of an enemy's approach, and therefore felt a decided sense of security, despite the living silence of the night. Long before midnight she was tense with nervous apprehension. Sounds from the jungle arose from time to time where some animal prowled for its prey. A whisper came up from the waves that lapped the cliff, and haunted the air as if with spirits. She had steeled her heart, however, and would not weaken by a jot. The hours would wear away somehow, and meantime--Sidney was resting. She did not arise to walk about as Grenville would have done. Instead she sat there, stiffly alert, turning her head from side to side, as the minutes dragged heavily by, listening, staring through the darkness, fancying shapes had begun to move in the shadows of the rocks. It was finally late in the dead of night when a sound of unusual heaviness arose from the brink of the cliff. Had someone dropped a rock in the sea, the disturbance could scarcely have been clearer. It had come, she thought, from over beyond the great black tree that loomed against the sky. She wondered if perhaps she ought to speak to Sidney. She put out her hand to touch him lightly on the shoulder, but withdrew it again with a smile. He was sleeping so like a tired boy! The sound had doubtless been nothing to rouse the slightest alarm. If it came again---- It did come again, less loud and distinct, but none the less unmistakable. Her heart responded immediately with a quicker, heavier beat. Perhaps she should try to ascertain the source or the cause of the noise. She should feel so ashamed, so weak and burdensome, to Grenville if she woke him for nothing at all. To look about was assuredly part of her duty while on guard. It was only a step to the edge of the terrace, across familiar ground. Chiding herself for unwarranted timidity and lack of courage, she silently left her seat at last and stepped from Grenville's side. One of his sticks was lying near. She took it in her hand. Then over through the shadows she glided as noiselessly as a spirit, goading herself to the ordeal with thoughts of the bold and fearless manner the man would show were he in her place on this safe and childish excursion.