The entrance was like the neck of a bottle, widening as it led into the cliff, and it was over-shadowed by jutting rocks. It had been quite invisible up to this time, and the boat had gone only a few yards further before it became invisible again, so well was the opening hidden by the rocks.
“Here’s a find!” exclaimed Frank, in excitement. “Let’s turn back and see where this goes to.”
Tony swung the boat around and the craft slowly made its way back toward the hidden cove. Soon the opening in the cliff came into view again.
“It’s just large enough for the boat to go through,” said Tony. “Want me to try it?”
Frank nodded.
“Go ahead.”
The nose of the boat turned toward this strange bay and then the Napoli began to enter the cove.
“Maybe I won’t be able to get out again,” said Tony suddenly. He looked ahead. But the passage widened into a bay of considerable extent, quite sufficient in size to enable him to turn the craft around once he had entered. So he continued.
But the cove proved uninteresting. The sides were steep, although dense bushes grew about the base of the slopes, but there was no path, no trail, no indication that any human being had ever been in the place. Being protected from the wind, the water was calm. The echoes of the motorboat’s engine were flung back from every side in a roaring volume.
Suddenly Frank gave a gasp of surprise!