“Then Mr. McCoy really was the man responsible for those mysterious broadcasts—the Voice from the Cave?”
“No doubt he had helpers,” Mr. Parker contributed. “We expect to track down most of the ring now that the leaders have been captured. At any rate, we’ve put an end to the broadcasts. Your other theory was right too, Penny.”
“What theory, Dad?”
“That the cave effect was produced by an echo chamber.”
“Then no broadcast ever originated in a cave?”
“Probably not. We know McCoy shifted locations frequently. Tonight was the first time he ever dared broadcast from the lighthouse.”
“And what of the old beachcomber, Jake Skagway?”
“Just a beachcomber,” Jerry answered. “He had no connection with Emory or Mrs. Deline.”
Penny lay perfectly still for a few minutes, gazing up at the dark sky. A few stars pricked the black canopy above her, and now and then a quarter moon peeped from behind a cloud screen.
“How did I get aboard this boat?” she presently inquired.