As the days passed he gained in health and strength until he was able to walk out. Then the wonderful sea air of Harbor View practically completed the recovery, until Dr. Martin declared that there was no further use for medicine, and only nourishing food was needed.

"But about his mind," the physician went on, "time alone can heal that. We must be patient. Take him out with you, Andy and Frank, when he is able to go, and let him have a good time. That will help as much as anything."

In the meanwhile, pending the gaining of complete strength on the part of Paul Gale, as he was now called, the two Racer boys made many trips around the Shark's Teeth in their sailboat, looking for the wrecked motor craft. But they could not locate it. Nor were their inquiries any more successful. Sailors and fishermen who went far out to sea were questioned but could give no trace of the wreck.

"Guess we'll have to give it up," said Andy with a sigh one day.

"It's like the mysterious man," added his brother.

Mr. Racer was much interested in the efforts his sons were making to solve the mystery of Paul Gale. He even advertised in a number of papers, giving details of the rescue, and asking any persons who might possibly know the history of such a youth as he described, to call on him at his New York office. But none came.

Paul had not yet ventured far from the house, for he was still rather weak. His arm, too, was very painful, and he could not yet accompany his two friends on any of their rowing or sailing trips.

"But I'll go soon," he said one day, when Frank and Andy started off for the beach, with the intention of interviewing some lobstermen who were due to arrive from a long cruise out to sea. "Some time I'll surprise you by coming along."

"Glad of it," called Frank, linking his arm in that of his brother. Together they strolled down on the sands, to await the arrival of the lobstermen. They found Bob Trent there, loading up his wagon with soft clams, which he had just dug.

As Bob tossed in shovelful after shovelful of the bivalves, the two Racer boys saw approaching the vehicle a youth of about their own age but of entirely different appearance. For, whereas the Racer boys dressed well they made no pretense of style, especially when they were away on their vacation. But the lad approaching the wagon was "dressed to kill clams," as Andy laughingly expressed it.