"It is the truth," I interposed. "We came down the passage. At its end was a carved vine, a vine of five flowers"—the fire died from the red dwarf's eyes, and I could have sworn to a swift pallor. "I rested a hand upon these flowers, and a door opened. But when we had gone through it and turned, behind us was nothing but unbroken cliff. The door had vanished."

I had taken my cue from Marakinoff. If he had eliminated the episode of car and Moon Pool, he had good reason, I had no doubt; and I would be as cautious. And deep within me something cautioned me to say nothing of my quest; to stifle all thought of Throckmartin—something that warned, peremptorily, finally, as though it were a message from Throckmartin himself!

"A vine with five flowers!" exclaimed the red dwarf. "Was it like this, say?"

He thrust forward a long arm. Upon the thumb of the hand was an immense ring, set with a dull-blue stone. Graven on the face of the jewel was the symbol of the rosy walls of the Moon Chamber that had opened to us their two portals. But cut over the vine were seven circles, one about each of the flowers and two larger ones covering, intersecting them.

"This is the same," I said; "but these were not there"—I indicated the circles.

The woman drew a deep breath and looked deep into Lugur's eyes.

"The sign of the Silent Ones!" he half whispered.

It was the woman who first recovered herself.

"The strangers are weary, Lugur," she said. "When they are rested they shall show where the rocks opened."

I sensed a subtle change in their attitude toward us; a new intentness; a doubt plainly tinged with apprehension. What was it they feared? Why had the symbol of the vine wrought the change? And who or what were the Silent Ones?