"Hurry," ordered Barry. "Inside! If we meet him after we're in, that's too bad for him." Silently as the whiteness about them, the party filed into the Crypt. It was colder here, for the tunnel sloped sharply downward, and the air was heavier. They had gone only a few steps before the last wisps of the mist disappeared. The heavier air had held it out of the Crypt. About them, the walls shone with a faint radiance. "Now!" Barry turned to the girl. The party had been under his command from the beginning. Even the Martians had at last recognized that this Earthman was a leader. "Hypnotize the old Martian. With a willing subject, you can produce a deep hypnosis. Command him to think of the Crypt, remember every thing he ever heard about it, or saw in it, from the time he was an infant!" Deisanocta's eyes bored into the rapt, obedient face of the old Martian. She murmured softly, sleepily in their tongue. The other's face slowly smoothed, his eyes going blank. Her words became sharp, commanding, insistent. Under their leashing, the old one's brow furrowed. He was remembering, digging deep into forgotten recesses of his mind. At last Deisanocta spoke to Barry. "I see the Crypt seventy years ago. This one was here as an infant in his father's arms. "It was different. There are fewer bodies. Their clothes are strange. None bear the wounds of battle." "Remember what we're looking for," snapped Barry. "I am deep down in the Crypt," came the girl's voice, weaker. "Deeper than even I have ever been. I do not know the part. There is something here, something big--I cannot make it out. It is very faint in this one's mind." "Tell him to lead us to it," said Barry. "That will save your strength." Seconds later they were following the old Martian through a labyrinth of tunnels. He moved rapidly, unhesitantly, his face wooden and intent. Deisanocta was beside Barry, her hand in his. "Can it be?" she questioned. "Is the answer as simple as this?" "I hope so," he told her. "It is something you wouldn't have thought of, because you did not remember all you were taught about hypnotism. And no one else could have done it against the old one's will." "Look!" Deisanocta cried suddenly. "He has lost his way." "Impossible," Barry said. But the old Martian was leading them toward a blank wall. Still he did not hesitate. With steps rapid, certain, he marched directly into the wall. His head struck, and he fell, rolling to their feet. * * * * * Barry bent over him quickly, then rose one hand digging at the wall. "It's soft dirt," he explained. "Didn't hurt him. He's only stunned." He stepped back to Deisanocta. "That's why Grey did not find whatever is here. It's somewhere behind that wall--cut off by an earth slide!" "But--what is there?"