“Pedal protuberances, eh, Tip?” chuckled Mr. Hope, “What do you say, Grover?”

As Roger looked toward his cousin he saw what surprised him most of all that had so far happened.

Never in his stay at home or laboratory, intimately close to the scientifically brilliant, but poised, cousin, had Roger seen him lose his calm.

Now, Grover stood up, and in his eyes was the same sort of light of satisfaction and triumph that a boy would show when he had successfully smuggled in and hidden mother’s birthday present.

“Roger is absolutely right!”

“Claws on glass? A big dog?” asked Mr. Zendt.

“Remember the cellar step clue.”

“A lizard?” Mr. Ellison suggested.

“Remember Tip’s statement about how he was knocked senseless.”

“Oh—a man with a—a what?” Mr. Millman was not so confident of his deductive ability. He paused.