d out!" exclaimed Fred; and
without waiting for the others to reply, the young lieutenant dashed
over the rocks and through the brushwood in the direction of the bay
shore. As he did this he took out his handkerchief and waved it
wildly, at the same time calling at the top of his lungs.

The motor boat, a long, rakish-looking craft, was cruising quite close
to the shore, and presently some of those on board noticed Fred's call
for aid. The motor of the craft was shut off, and the boat drifted up
to the shore.

"What do you want?" demanded one of the men on board, sharply.

"We want help, and we want it right away!" declared Fred. And then he
added as he got a better view of those aboard the boat: "Are you
United States officers?"

"What do you want to know that for?" was the counter question.

"Well, if you are, we want your help, and want it right away."

"Why? Have you discovered anything unusual?" demanded one of the
officers on the boat, and his manner showed his intense interest.

"We certainly have! And more than that, we have made a prisoner--a
German."

"You don't mean it!" said one of the other men aboard the motor boat,
and then looked more sharply at Fred than ever. "We'll have to
investigate this," he added to his companions.

There were three officers and a crew of eight aboard the boat, which
was quickly brought long-side the rock on which Fred was standing. As
the officers leaped ashore, the young lieutenant saluted and was
saluted in return. Then Fred told who he was and again asked the men
if they were United States officers.

"If you've got a German prisoner, and you know he is really a German
sympathizer, you had better take us to him at once," said one of the
men, and, turning back his coat, he exhibited his badge.

Feeling that the craft was one really belonging to our government and
that the officers were Secret Service men, Fred told his story, at the
same time leading the way to where he had left Jack, Gif, and the
prisoner.

"Bailey was right, after all," said one of the Secret Service men to
his fellow officers. "He always declared that that wrecked submarine
was in hiding somewhere around these waters."

"Then you know about the submarine?" queried Fred quickly.

"If it's the craft we think it is," was the reply. "That U-boat had an
encounter with one of our submarine destroyers, and in trying to
escape we think she hit some of the rocks on the reef beyond here.
Some of the n