The invisible eavesdropper had gone into one of these rooms! I listened at each of the panels, but there was only silence within.
The interior of the ship was suddenly singing with the steward's siren—the call to awaken the passengers. It startled me. I moved swiftly away. But as the siren shut off, in the silence I heard a soft, musical voice:
"Wake up, Anita, I think that's the breakfast call."
And her answer, "All right, George."
IV
I did not appear at that morning meal. I was exhausted and drugged with lack of sleep. I had a moment with Snap to tell him what had occurred. Then I sought out Carter. He had his little chart room insulated. And we were cautious. I told him what Snap and I had learned: the rays from the Moon, proving that Grantline had concentrated a considerable ore body. I also told him of Grantline's message.
"We'll stop on the way back, as he directs, Gregg." He bent closer to me. "At Ferrok-Shahn I'm going to bring back a cordon of Interplanetary Police. The secret will be out, of course, when we stop at the Moon. We have no right, even now, to be flying this vessel as unguarded as it is."
He was very solemn. And he was grim when I told him of the invisible eavesdropper.
"You think he overheard Grantline's message? Who was it? You seem to feel it was George Prince?"