“Very well, sir,” he answered the German, “but first you will please permit me to see to my friend.”

He indicated Frank’s prostrate form across the room.  The German saw it then for the first time and nodded assent.

“Also,” said Jack, “it would be well if you did not permit that man,” indicating Davis, “to escape.  He is a traitor.”

“So?” exclaimed the officer.

He drew his revolver and mounted guard over Davis.

“There is really no use my guarding you,” he said.  “Half a dozen of my men are below, so you could hardly escape.”

In the meantime Jack bent over Frank and raised his chum’s head to his knee.  Then he arose, asked permission of the German to leave the room for water.  The permission was granted and Jack returned a moment later, his cap filled with water.

He sprinkled the water over Frank’s face and soon perceived signs of returning consciousness.  Frank drew a deep breath and opened his eyes.  Then he pushed Jack aside and sat up.

“What’s happened?” he asked in a faint voice.

In a few words Jack explained.

“I remember now,” said Frank.  “Help me up.”

Jack did so and then for the first time Frank caught sight of the German naval commander.

“What’s he doing here?” he asked of Jack.

“Oh, he’s just arrested us; that’s all,” said Jack.

“Yes,” said the German, “and I must ask you to accompany me now.  You shall come aboard my ship until this matter has been investigated thoroughly.  I’ll take charge of you, rather than to turn you over to the military authorities; for after all you are naval officers and I shall help you if I can.  Please precede me; and you too,” this last to Davis in a gruffer tone.

All proceeded below, where eight or ten other men stood waiting.  Then all marched away.

Reaching the water front all entered a small boat and were rowed toward a submarine, perhaps a quarter of a mile away.

As they passed, Jack noticed the U-6 a short distance away and made out Lord Hastings’ figure on the bridge.  He raised an arm and waved it.  He was not sure that his signal had been seen, but he did not wish to draw further attention to his commander.

Aboard the submarine the German commander had them taken to his own cabin, where he insisted upon his own surgeon dressing Frank’s wound and having a look at Jack’s arm.

The surgeon pronounced both injuries slight and prescribed rest.  Several times Frank caught the German commander looking at him curiously and it worried him somewhat, for there was something familiar about the man, though Frank could not seem to place him.

“I’m just trying to think,” said the German to Frank, “where I have seen you before.  I don’t place your name.”

“I can’t remember you, sir,” replied Frank.

Suddenly the German slapped his thigh.  Frank’s heart sank for some reason he was unable to explain to himself.