"To tell the submarine some piece of news, of course—perhaps the port of sailing, something of the nature of our cargo, or perhaps to tell just where to send the torpedo. I understand we are carrying some munitions, and it may be that this German spy directed the commander of the submarine where to aim the torpedo so as to explode them."
"But he'd be signaling for his own death warrant!" cried Joe.
"Not necessarily," answered Blake. "He may have had some understanding with the submarine that he was to be saved first. Perhaps he was going to jump overboard before the torpedo was fired and was to be picked up. Anyhow, I saw him draping a white cloth over the side, and I'm sure it was a signal."
"Well, I guess you're right," said Joe. "The next question is, what's to be done? This fellow is a spy and a traitor, and we ought to expose him."
"Yes," agreed Blake. "But we'd better have a little more evidence than just my word. You fellows didn't see what I saw, that's plain, and perhaps no one else did. So it would only make a big fuss and not result in anything if I told the captain."
"Then what are you going to do?" asked Charlie.
"Just keep watch," Blake answered.
"What about Lieutenant Secor?" asked Joe.
"Well, I didn't see him do anything," admitted Blake. "Though I have my suspicions of him also. He and Labenstein weren't talking so earnestly together for nothing. We'll watch that Frenchman, too."
"And if he tries any more games in spoiling films I'll have my say!" threatened Macaroni.