As Frank had declared, they could not be far from the sunken Isle of Mona. And, indeed, a few hours later they came upon precipitous bluffs and forests of decaying trees.

The island was beneath them. There was no doubt of this. The voyagers were alive with the keenest of interest.

Ordinarily there would have been but a scant desire to search for the buried treasure. But their experience with Poole had aroused their interest.

Frank had a strong inclination to visit the scene of the treasure hunt. So he held the Diver closely along the island and shore.

It was remembered that Poole had described the gold cave as upon the northern shore. When attacked by the Caribs he and his companions had escaped in their boat, so it could not have been far from the surf to the cave.

It should, therefore, be easy to find. Barney and Pomp were especially on the lookout.

CHAPTER X.
AT THE TREASURE CAVE.

Slowly and steadily the Diver crept along the shore of the sunken island. The voyagers were on the qui vive.

“Perhaps Poole is there before us,” said Wade. “He has had plenty of time.”

But Frank was incredulous.