The officer hurried to answer. When he returned, his face was tense with worry.
"Something's wrong!" he rapped. "It looks like the Nazis have made a play for that formula already! I've got to get right back to the laboratory!"
Henry and the professor still were excitedly discussing this news when, half an hour later, the 'phone rang again. This time the tall scientist answered. He returned to the porch frowning.
"That was Coggleston," he reported. "Apparently the spy didn't get the formula, but he made a clean getaway, and he killed a sentry to do it."
"Oh, that's terrible!" Henry was afire with indignation. "Of all things! Killing a sentry—"
"Yes." The professor nodded. "The trouble is, Coggleston says they don't have much to go on. No description, except that he was big and had red hair—"
"Red hair!"
"Yes. Red hair." The savant eyed Henry suspiciously. "Why does that surprise you so?"
"Why ... er ... oh, it doesn't. I mean—"
"What do you mean?"