“Mack Guire,” he supplied; “and you are Professor Sykes…. Oh, we know you!” he laughed; “we have been watching you since your arrival; we have been waiting to help you.”

The professor was open-mouthed.

“Your thoughts,” explained the other, “are as a printed page. We have been with you by mental contact at all times. We could hear, but, at that distance, and—pardon me!—with your limited receptivity, we could not communicate.

“Do not resent our intrusion,” he added; “we listened only for our own good, and we shall show you how to insulate your thoughts. We do not pry.”

Lieutenant McGuire waved all that aside. “You saved us from them,” he said; “that’s the answer. But—what does it mean? Those others are in control; they are attacking our Earth, the world where we lived. Why do you permit—?”

Again the other’s face was set in sterner lines.

“Yes,” he said, and his voice was full of unspoken regret, “they do rule this world; they have attacked your Earth; they intend much more, and I fear they must be successful. Listen. Your wonderment is natural, and I shall explain.

“We are the people of Venus. Some centuries ago we ruled this world. Now you find us a handful only, living like moles in this underworld.”

“Underworld?” protested Professor Sykes. He pointed above to the familiar constellations. “Where are the clouds?” he asked.

The girl, Althora, leaned forward now. “It will please my brother,” she said in a soft voice, “that you thought it real. He has had pleasure in creating that—a replica of the skies we used to know before the coming of the clouds.”