“Glad to have you,” the professor replied, though without cordiality.

“We want to write a feature story about your machine too,” Penny continued. “For the newspaper.”

The request displeased the professor. Scowling, he said curtly:

“I am sorry, but there must be no publicity at this time—orders of the Navy, you know.”

“The Navy is interested in buying your machine?” Penny asked, hoping to lead him on.

“The deal is concluded except for my signature,” the professor said, darting a quick glance at Mr. Johnson. “I should have signed at once, but I promised Mr. Johnson first chance to buy the machine.”

“I suppose the Navy men are in town now?” Penny inquired.

“In Riverview.”

“At the Gables Hotel?” Penny pursued the subject.

The professor looked at her sharply, for the first time suspecting that she was inducing him to reveal far too much.