The boy's words were broken off by a low-voiced call from the slinking figure. It asked:
"Are you American, French or English prisoners?"
"Some of each variety," answered Jack, while at the sound of that voice Tom Raymond felt a thrill of hope.
"If you get out, is there a chance for you to get away in your aircraft?" the figure in the shadow questioned. "Be careful, don't let the guards hear."
"There are only two, and they're over at the front gate," said Jack, as Tom drew nearer in order better to hear the tones of that voice. "They seem more occupied in watching the fire than in looking at us," went on Jack.
"Good!" exclaimed the man. "Now listen. I am an American, and I was captured by the Germans, through spy work, some time ago, in Paris. I was brought here, and they have been trying to force me to disclose the secret of some of my inventions.
"I refused, and was sentenced to be shot to-morrow. But to-night you fortunately raided this place. My prison was one of the places to be blown up, and I managed to escape, without being hurt much. I heard that they had captured the crew of one of the airships, and I came to see if I could help. They don't know
