Elaine was persuaded at last to retire, though she knew she should not sleep. Grenville remained on guard alone, pacing back and forth from the head of the trail to the lone tree reared above the cliff. His senses were strained to catch the slightest sound, but none came upward from the sea. From time to time he halted by their smoldering bit of coals to assure himself the last of the sparks had not been permitted to die.
At length, far in the silent night, the tidal wailing began, its weirdness increased an hundredfold by the tension of the hours. It seemed to Grenville unusually loud, so acute had the darkness made his hearing.
No sooner had the final note died out on the gently stirring air than answering cries, no less weird and shrill, arose from out upon the water. The visiting craft had drifted past the headland and was somewhere off on Grenville's right. The cries from its deck were like a response to some spirit of the island. They were rather more awed than exultant, Grenville felt, and he fancied some chanting, that came to him brokenly out of the heavy shades of night, was possibly a prayer.
When he came before her shelter again, Elaine was standing in the door. She had heard the cries from the boat.
"They haven't landed yet?" she said, in a whisper.
"They won't land now till daybreak, and perhaps not then," he answered. "Go back--and go to sleep."
"I'll try," said Elaine, and disappeared.
For Grenville, however, there could be no sleep, though the darkness rendered up no further sound. Like the outer sentry of a picket-line, with the enemy close, and his whereabouts unknown, he glided silently from one dark edge of the terrace to another, as the hours wore on, alert for the slightest alarm.
He finally sat by the head of the trail, convinced that the visitors would give him no trouble till morning, yet guarding the only way by which they could gain the summit of the hill.
He was weary and doubtless he nodded, lulled by the softness of the breeze that came up at last, burdened with its ozone from the sea. And, despite the fact he was afterwards positive the nod was the briefest in the world, full daylight was spread to the ends of the world, and the sun was gilding the island's tufa walls, when at length he started to his feet.