"And the next night I did the same thing. Engrossed in research, I let the moments go by to the danger point, and scarcely was I replaced within the vault when the shining thing raced over the walls, and in its grip the woman and child.
"Then you came—and that is all. And now—what is it you know?"
Very briefly I went over my story. His eyes gleamed now and then, but he did not interrupt me.
"A great secret! A colossal secret!" he muttered, when I had ended. "We cannot leave it hidden."
"The first thing to do is to try the door," said Larry, matter of fact.
"There is no use, my young friend," assured Marakinoff mildly.
"Nevertheless we'll try," said Larry. We retraced our way through the winding tunnel to the end, but soon even O'Keefe saw that any idea of moving the slab from within was hopeless. We returned to the Chamber of the Pool. The pillars of light were fainter, and we knew that the moon was sinking. On the world outside before long dawn would be breaking. I began to feel thirst—and the blue semblance of water within the silvery rim seemed to glint mockingly as my eyes rested on it.
"Da!" it was Marakinoff, reading my thoughts uncannily. "Da! We will be thirsty. And it will be very bad for him of us who loses control and drinks of that, my friend. Da!"
Larry threw back his shoulders as though shaking a burden from them.
"This place would give an angel of joy the willies," he said. "I suggest that we look around and find something that will take us somewhere. You can bet the people that built it had more ways of getting in than that once-a-month family entrance. Doc, you and Olaf take the left wall; the professor and I will take the right."