"But—but—I still do not understand."
"Of course not, because we've kept ourselves hidden from the world for more than twenty-two years, waiting for this very moment. There are forty-one of us, including Rudolph, my brother. We have lived in the jungle since Boris conquered the Eastern Hemisphere. But amongst our numbers were several scientists, two greater than was Boris, even in his heyday. They have done wonderful things and we are now prepared to take back what was taken from Derek—and more. His life we can not restore—Heaven rest him—but his kingdom we can. And to his son it shall be returned.
"You were given into Rudolph's care when little more than a babe in arms and he has cared for you well. We've watched, you know, in the detectoscopes—long range radiovision mechanisms that can penetrate solid walls, the earth itself, to bring to us the images and voices of persons who may be on the other side of the world. We've followed your every move, my boy, and the first time we feared for you was yesterday when the drug of the Zar's physician stole away your sense of right and wrong. But we were in time to save you, and now we are ready to kneel at your feet and proclaim you our king. First there is the Zar to be dealt with and then we shall set up the new regime. Are you with us?"
KARL gazed at the speaker in wonder. He a king? Always to live amongst the wearers of the purple? To be responsible for the welfare of half the world? It was unthinkable! But Zar Boris, the murderer of his own father—he must be punished, and at the hands of the son!
"I'll do it," he said simply. "That is, I'll do whatever you have planned in the way of exterminating the Zar. Then we'll talk of the new empire. But how is the Zar to be overcome? I thought he was invincible, with his Moon men and terrible weapons."
"Ah! That, my boy, is where our scientists have triumphed. True, his rays were terrible. They could not be combatted when he first returned. The strange chemicals and gases of the Moon men defied analysis or duplication. His citadel atop the city of Dorn is proof against them all; proof against explosives and rays of all kinds known to him. The disintegration and decomposition rays have no effect on the crystal of its walls. It is hermetically sealed from the outer air so can not be gassed. The vibration impulses have no effect upon its reinforced structure. But there is a ray, a powerful destructive agent, against which it is not proof. And our scientists have developed this agency. You shall have the privilege of pressing the release of the energy that destroys the arch-fiend in his lair. His dominance over, the empire will fall. We shall take it—for you."
A strange exaltation shone from the faces of those in the room, and Karl found that it was contagious. His bosom swelled and he itched to handle the controls of this wonderful ray.
"This ray," continued the brother of old Rudolph, "carries the longest vibrations ever measured, the vibrations of infra-red, the heat-ray. We have succeeded in concentrating a terrific amount of power in its production, and with it are able to produce temperatures in excess of that of the interior of the earth, where all substances are molten or gaseous. The Zar's crystal palace cannot withstand it for a second. He cannot escape!"
"How'll you know he's there at the time?" Karl was greatly excited, but he was curious too.
"Come with me, my boy. I'll show you." The old man led him from the room and the others followed respectfully.
THEY stopped at a circular port and Karl saw that they were high above the earth in a vessel that hovered motionless, quivering with
