“Oh, yes!” Doris sprang up. “Let’s do that! Anything to help!”

“I know the spot, within a mile,” said Dave. “Kennedy showed me on the map. It’s not over three miles from here.”

“Good! We shall weigh anchor at once,” exclaimed the professor. “In the steel ball, Dave, you should be able to locate the schooner in a very short time.”

“And then?” asked Dave.

“One problem at a time,” smiled the professor, who during his long life had solved many a problem.

Fifteen minutes more and they were away.

“Do you think we shall be able to find their sunken schooner?” Doris asked, as she and Dave stood in the prow, looking at the hills. “That depends,” said Dave. “Just now, another problem interests me more.”

“And that?”

“Whether that girl, who seems the very spirit of the island, ever will sail that schooner again.”

“Never doubt it,” said Doris. But in spite of her high hopes, she herself was in grave doubt.