Grenville could hardly repress a smile.

"If they try to steal the gun, I think we'd be justified in firing. At any rate, I shall fire first and debate the question later."

Elaine was growing nervous, now that all they could do was practically accomplished.

"Oh, I wish it was over!" she declared. "Do you think they'll attack us soon after landing?"

"They may not land this evening."

Grenville was thinking of the tidal sounds that haunted the island's wall. These were still of considerable volume every day, and, according to his theory, frightened the ignorant natives away. He added, presently: "You see, they may be aware the tiger was living here before we disturbed his possession. In that event they might be cautious of landing after dark. They rarely take chances, I believe, by attacking in the night."

"But suppose they arrive an hour or two before sunset?"

"They might, if the breeze should freshen.... We can only wait and see."

But this waiting was an irritating business, so slowly did the craft appear to move against the tide and so fraught with possibilities was its visit to the place.

Sitting or stooping behind the rocks, Elaine and Grenville kept a constant watchfulness on the boat, now less than half a mile away. It was apparently becalmed. The day grew old and still it came no nearer.