“Seemingly at or near the lighthouse.”
“The lighthouse!” Penny exclaimed. She was so startled that her voice rose to a high pitch, attracting the attention of a passing bellboy.
“Not so loud, Penny,” her father warned. “The strange thing was that the broadcast seemed to come from a cave, the same as before, although the monitoring machines charted it as being close to the lighthouse.”
“The only one I know about near the Point is Crystal Cave,” Penny said thoughtfully. “Dad, maybe the broadcast did come from the lighthouse!”
“That’s government property. Penny, and the man in charge is beyond suspicion. Furthermore, the deep, echo effect couldn’t come from anywhere except a cave.”
“Unless it were a sound effect, Dad.”
“What’s that?” Mr. Parker asked, startled. “I don’t get you, Penny.”
“I mean, maybe the cave set-up is just a sound effect and nothing more. Only the other night I heard one in a radio play and it sounded as if the actors really were in a cave. Isn’t it done by an echo chamber or something of the sort?”
“That would be possible,” Mr. Parker agreed. “At Interceptor Headquarters it was assumed that a mistake had been made in charting the location of the station.”
“Then the lighthouse hasn’t been investigated?”