"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?"