“I guess there is no question about the identity of your visitors. They are the same ones who attempted to kidnap you. What’s the reason for all of your popularity?”

Bob shook his head.

“I only wish I knew,” he said. “Believe me, it is no fun to have your room torn apart like that. Why they ruined my clothes and it’s going to be mighty costly getting them repaired.”

“I’ll help you out if you’re pinched for money,” volunteered his uncle, reaching for his billfold.

But Bob waved the offer aside.

“Thanks, but I’ll get along all right. If I ever catch up with those fellows they’ll have to get their fists into action pretty fast if they want to escape a thorough drubbing.”

“I don’t blame you a bit for feeling that way. But we’ve got to get along. I have an appointment with one of the army’s chief radio engineers in less than fifteen minutes and I want you to sit in.”

They signalled for a cab and started for the meeting which was to reveal some startling information on Bob’s first case.

Chapter XVII
THE RADIO SECRET

Merritt Hughes leaned back in the seat as the cab darted in and out of the heavy traffic on the avenue.