"My brother did bring back information," he said. "His method of hiding messages on his person was by means of a hollowed out false tooth that not more than one dentist in a hundred would detect. In that hollow tooth was a postage stamp size original of this map, and some instructions."
"Dope on the secret Nazi weapon, sir?" Dave asked eagerly as the Intelligence officer paused again.
"Some," was the quiet reply, "but not nearly enough. To be perfectly truthful, my brother still didn't get complete details. He only learned that somewhere in this area covered by the map the Nazis have installed this new weapon, and...."
Colonel Trevor cut himself off short and nodded at Dave.
"Your hunch was a good one, Dawson," he said. "According to my brother's report, the Nazis have installed the weapon there for the purpose of experiments and tests. As I said, he did not know what the weapon is. He was only able to find out that it is to be used primarily against aircraft."
"Not against troops?" Freddy Farmer spoke up. "Then how do they expect to beat off an invasion attempt. They...! That's rather silly of me, isn't it?"
"What, Farmer?" Squadron Leader Markham asked with a puzzled frown.
"The question, sir," the English youth replied and blushed faintly. "I suddenly realized that the answer is obvious. This war has proved that the side that has control of the air is the side that comes out on top. So, if the Nazis are able to maintain control of the air over Occupied Europe, all the invasion troops in the world wouldn't of much use to us."
"Right, Freddy!" Dave said with a grin. "Go to the head of the class, my boy. Did you learn anything else, Colonel?"
"Sorry, but that's all, Dawson," the Intelligence officer replied. "But it should help you a little. At least you won't have to waste time buzzing around over the entire area. Concentrate on the spots covered by this map. Here, better take my copy along with you. Well.... Well, good luck, chaps. And God speed back home again."