d the craft
from the opposite side. Frank raised a cry:

"Hurry, Jack!"

Jack needed no urging. He was swimming through the water as fast as
possible.

With a sudden move, Frank jerked his hand loose from the grip that held
him and turned just in time to encounter the second German. Frank
raised his revolver and fired quickly; but the German ducked, and
before Frank could fire again, he had come up close to Frank and
grappled with him. In vain Frank sought to release his arm so that he
could bring the weapon down on his opponent's head. The man clung
tightly.

A sudden lurching of the hydroplane told Frank that the second German
was coming aboard. Unmindful of his wounded shoulder, Frank struggled
on. With a sharp kick of his right foot he succeeded in knocking the
first German's legs from beneath him; and again the lad tried to raise
his revolver to shoot the second German, who now advanced.

But the latter was too quick for him. Closing with the lad, the man
knocked the revolver from the boy's hand with a quick blow. The weapon
spun into the sea.

The first German returned to the attack.

"Get him quick!" he shouted. "There is another one around here some
place."

Jack, at this moment, was within a few yards of the boat.

"You bet there is!" he said between his teeth. "And he'll be there in a
minute."

He did not call encouragement to Frank, for he wished to get aboard the
plane, if possible, before the men could stay him.

The two Germans rushed Frank simultaneously, and bore him back in the
plane. At the same instant, Jack, unmindful of danger that might lurk
aboard and thinking only of Frank's danger, laid hold of the plane and
climbed aboard. Then he stood erect and shouted:

"Come on, you cowards! Here's the other one!"

CHAPTER XI

DAWN--AND A NEW ENEMY

The two Germans, just about to throw Frank overboard, turned quickly at
the sound of this new voice. They wasted no time.

"At him!" cried one, and leaped.

The other sprang after him.

Jack, with his feet wide apart and arms extended, braced himself to
receive the shock; and when it came he was ready. Frank, in the
meantime, sank down in the plane almost unconscious, for one of the
Germans had all but choked the life from him.

As the first German sprang, Jack met him with a straight right hand
blow to the face and the man reeled back. The second, seeing the fate
of his companion, dived for Jack's legs and seized them, pulling t