“Oh, Dr. Fairchild! There was a. . . .” But the report which Ryder was about to make was unnecessary; the alarm had already been given.

“I know,” the scientist puffed. “Stop! Stay exactly where you are!” He jabbed a finger emphatically downward to anchor the young couple in the spot they occupied. “Don’t talk—don’t say a word until I get back!”

Fairchild returned after a time, unhurried and completely at ease. He did not ask the shaken couple if they had seen what had happened. He knew.

“Bu . . . buh . . . but, doctor,” Ryder began.

“Keep still—don’t talk at all.” Fairchild ordered, bruskly. Then, in an ordinary conversational tone, he went on: “Until we have investigated this extraordinary occurrence thoroughly—sifted it to the bottom—the possibility of sabotage and spying cannot be disregarded. As the only eye-witnesses, your reports will be exceedingly valuable; but you must not say a word until we are in a place which I know is proof against any and all spy-rays. Do you understand?”

“Oh! Yes, we understand.”

“Pull yourselves together, then. Act unconcerned, casual; particularly when we get to the Administration Building. Talk about the weather—or, better yet, about the honeymoon you are going to take on Chickladoria.”

Thus there was nothing visibly unusual about the group of three which strolled into the building and into Graves’ private office. The fat man raised an eyebrow.

“I’m taking them to the private laboratory,” Fairchild said, as he touched the yellow button and led the two toward the private elevator. “Frankly, young folks, I am a scared—yes, a badly scared man.”

This statement, so true and yet so misleading, resolved the young couple’s inchoate doubts. Entirely unsuspectingly, they followed the Senior Radiationist into the elevator and, after it had stopped, along, a corridor. They paused as he unlocked and opened a door; they stepped unquestioningly into the room at his gesture. He did not, however, follow them in. Instead, the heavy metal slab slammed shut, cutting off Jackie’s piercing shriek of fear.