this area. We don't even know where to start to hunt."

"Excuse me, major—" gulped Henry.

The military man whirled on him.

"What is it? Have you thought of something else?"

"Why, about where to start to hunt—"

"Yes?"

"Why don't you try the nudist camp?"

"The nudist camp?" Professor Paulsen exploded. "Are you completely crazy, Henry? Why would a spy be in a nudist camp?"

Henry glared back at him.

"No, I'm not completely crazy," he snapped peevishly. "And I don't know what a spy is doing in a nudist camp, but that's where he was when I sold him my glasses." He sniffed. "Really, Joseph, I get awfully tired of your acting like you were the only one around here who was half smart."

But Major Coggleston interrupted.

"Let's get this straight," he pleaded. "Where did you meet this red-headed man? How'd you come to sell him the glasses?"

"Oh, that?" Henry sniffed so hard his glasses slid down his nose. "Why, he was one of the men who was out peeking at the nudists." He turned to Professor Paulsen. "You remember, Joseph. He's the one who said I was telling the truth about my X-ray eyeglasses being able to look through the fence."

"Yes, heaven preserve me, I remember!" groaned the professor. "But why didn't I think—"

"So he asked me to sell him my glasses," Henry continued. "And when Joseph told me to get rid of them, I took them over to the nudist camp and sold them to him for fifty dollars."

"But how'd you know he was in the nudist camp?"

"How?" Henry's goatee jerked with contempt. "How would I know anyone was there? I saw him. He was right behind the blonde with the cute—"

"Henry!"

"Oh, all right. Anyhow, he was right behind a blonde girl. I saw him when I looked through my glasses while I was showing Joseph how to use them."

Again Major Coggleston paced the floor. His face was lined with worry. He bit nervously at his lip.

"I'll be damned if I know what to do!" he exploded. "I've got to find that spy. But I can hardly seize a whole nudist camp just because a red-headed man bought a pair of binoculars."

"Couldn't you ask that all red-headed men be brought to the gate?" suggested Professor Paulsen.

"No." The officer shook his head. "If the man we want is there, that would tip him off."

"Excuse me, sir," broke in the sergeant who accompanied Major Coggleston, "but why not just search the whole place with the men you've got detailed for guard duty? It wouldn't be much of a job."

The major nodded.

"If I have to, that's just what I plan," he replied. "However, there are women in that camp. Nude women. And, frankly, I don't hanker after any of the kind of publicity which undoubtedly would result from such a search. So I want to avoid it if I can."

"Then what—"

"I'll go in alone! That's it!" Major Coggleston straightened, suddenly decisive. "Sergeant, go back to the laboratory and round up all but a skeleton guard. Bring them back to the nudist camp and surround it. Don't let anyone escape! Do you understand me?"

"Yes, sir. I am to surround the nudist camp with our men as soon as possible, leaving only a skeleton guard on the laboratory."

"Right. On your way."

The sergeant strode out, and a moment later the car in the driveway roared to life. And back in the house, the major drew a deep breath.

"Well, I'm off!" he snapped. "Wish me luck!"

"Wait!" bleated Henry, his goatee waggling excitedly.

"What's the matter?"

"I'm going with you!"

"You?" Major Coggleston stared. "What for?"

Henry started in indignation at the other's tone. He drew himself to his full height and thrust his chin out aggressively.

"'What for?'" he mimicked. "Hmmph! Let me ask you a question, Mister Officer: how are you going to identify the man who bought my glasses if I'm not along?"

The major considered this. Then, at last:

"All right. I guess you'll have to come."