was the
sound of a shot and the lad felt a bullet whistle past his ear. He
dropped to the deck.

"Great Scott! I forgot about Jack being out there," he muttered. "He
almost picked me off that time." He raised his voice in a shout. "Hey,
Jack! quit that! It's me, Frank! We are prisoners!"

A moment later Edwards clambered over the side of the motorboat and this
time there was no shot. Frank felt sure that Jack had heard him and
understood the situation.

Now their two captors came quickly over the side and the first turned
upon Frank.

"Who were you shouting to?" he demanded.

"Oh, just a friend of mine," replied Frank, with a slight shrug of his
shoulders. "He's out there," and the lad waved an arm across the water.

"And what's he doing out there?"

"The same thing we were doing when you found us. Trying to get you
fellows."

"Oh, I see," was the reply. "You had us between two fires, eh. It's
lucky we put off before you got so close. We heard firing and came back
to have a look around."

"Then that's the way you spotted us, eh?" said Frank. "I didn't think
you could have got off without my seeing you."

The man made no reply to this, but turned quickly to the other.

"We'll have to get away from here at once, Fritz. Take the wheel."

The latter sprang aft with alacrity, while the first man leaned down and
began to tinker with the engine. Frank took a quick step forward and
seemed about to leap upon his captor, but the latter turned from the
engine and a revolver was in his hand.

"I wouldn't if I were you," he said quietly.

Frank stepped back.

"Oh, all right," he said.

The little motorboat began to move.

The captor raised his voice.

"Hans! Franz!" he called.

There was no answer and after a moment he repeated his calls.

"If you were calling your men, I fear you are wasting time," said Frank
quietly.

"What?" exclaimed his captor.

"Exactly," replied Frank. "It was necessary for us to shoot them before
you were fortunate enough to find us."

"I see," replied the boy's captor slowly. "Well, I shall have more to
say to you about that later."

He again began to tinker with the engine and the motorboat now increased
its pace; and then, as the man raised his head to look at Frank, he
perceived two dark figures suddenly clamber over the rail and dash
toward him.

Frank saw them in the same instant.

"Jack!" he cried.

The German, for such Frank felt sure his captor was, rose quickl