A quick glance showed him that he was in a small padded compartment like that of the pneumatic tube cars. At one end there was an amazing array of machinery with glittering levers and handwheels--a control board on which numberless tiny lights blinked and flickered in rapid succession.

At these controls squatted the twisted figure of a dwarf. A second of the creatures sat at his side and stared with those horrible green eyes.

"Lord!" he muttered. "Am I still asleep?"

"No," smiled the dwarf, "you're awake, Peter Van Dorn." The misshapen creature did not seem unfriendly.

"Then where am I, and who are you?"

"You're in one of the Zar's rocket cars, speeding toward Dorn. We are but two of the Zar's servants--Moon men."

"Rocket car? Moon men?" Karl was aghast. He wanted to pinch himself. But a hollow roar to the rear told him he was in a rapidly moving vessel of some sort. Certainly, too, these dwarfs were not figments of his imagination.

"You've been kept completely ignorant?" asked the dwarf.

"It--it seems so." Karl was bewildered. "You mean we are out in the open--traveling in s.p.a.ce--to the Moon perhaps?"

The dwarf laughed. "No, I wish we were," he replied. "But we are about halfway to the capital of the Continental Empire, greatest of world powers. We'll be there in an hour."

"But I don't understand."

"Stupid. Didn't you ever hear of the rocket ships that cross the ocean like a projectile, mounting a thousand miles from the surface and making the trip in two hours?"

"No!" Karl was aghast. "Are we really in such a contraption?" he faltered.

"Say! Are you kidding me?" The dwarf was incredulous. "Do you mean to tell me you know so little of your world as that? Have you never read anything? The news broadcasts, the thought exchangers--don't you follow them at all?"

Karl shook his head in growing wonder. Truly Rudolph had kept him in ignorance. Or was it his own fault? He had refused to dig into the volumes old Kra.s.sin had begged him to read. The broadcasts and the thought machines--well, only those of the purple had access to those.

"Hey, Laro!" called the dwarf to his companion, "this mole is as dumb as can be. Doesn't know he's alive hardly. And a Van Dorn!"

The two laughed uproariously and Karl raged inwardly. Mole! So that's what they called wearers of the gray! He clenched his fists and rose unsteadily to his feet.

"Sorry," apologized his tormentor. "Mustn't get sore now. It seems so funny to us though. And listen, kid, you'll never have another chance to hear it all. So, if you'll sit down and calm yourself a bit I'll give you an earful."

Mollified, Karl listened. A marvelous tale it was, of a disgruntled scientist of the Eastern Hemisphere who had conquered that portion of the world with the aid of the inhabitants he had found on the outer side of the Moon; of the scientist who still ruled the East--Zar of the Continental Empire. A horrible war--in 2085, the year of his own birth--depopulated the countries of Asia, Europe and Africa and reduced them to subjection. There was no combatting the destructive rays and chemical warfare of the Moon men. The United Americas, still weakened from a civil war of their own, remained aloof and, for some strange reason, the Zar left them in peace, contenting himself with his conquest of practically all of the rest of the world. Now, it seemed, the two major powers were as separate as if on different planets, there being no traffic between them save by governmental sanction; and that was rarely given.

It grew uncomfortably warm in the compartment as the rocket car entered the lower atmosphere but Karl listened spellbound to the astounding revelations of the Moon man. There came a pause in the discourse of the dwarf as a number of relays clicked furiously on the control board and the vessel slackened its speed perceptibly.

"But," said Karl, thinking aloud rather than meaning to interrupt, "what has all this to do with me? Why does the government of this Zar want me?"

The dwarf bent close and eyed him cautiously. "Poor kid!" he whispered, "it doesn't seem right that you should suffer for something that happened when you were born; something you know nothing about. But the Zar knows best. You--"

There came a stabbing pencil of light from over Karl's shoulder and the green eyes of the dwarf went wide with horrified surprise. He clutched at his breast where the flame had contacted, then slowly collapsed in a pitiful, distorted heap. Karl recoiled from the odor of putrefaction that immediately filled the compartment. He whirled to face the new danger but saw nothing but the padded walls.

Then they were in darkness save for the blinking lights of the control board. He was thrown forward violently and the piercing screech of compressed air rushing past the vessel told him they had entered the receiving tube at their destination and were being r.e.t.a.r.ded in speed for the landing. This much he had gathered from the explanations of the now silenced dwarf.

Laro, the other Moon man, remained mute at the controls. His companion evidently had talked too much.

The vessel had stopped and a section of the padded rear wall of the compartment moved back to reveal a second chamber. There were three other occupants of the ship and Karl knew now at whose hands the talkative Moon man had met his death. One of the three--all wearers of the purple--still held the generator of the dazzling ray in his hands.

He decided wisely that resistance was useless and followed meekly when he was led from the ship.

Endlessly they rode upward in a high-speed lift, dismounting finally at a pneumatic tube entrance. A special car whisked them roaring into the blackness. Then they were shot forth into the open and Karl saw the light of the sun for the first time in many years. They were on the upper surface of a great city, Dorn, the capital of the Continental Empire.

The air was filled with darting ships of all sorts and sizes, most of them being pleasure craft of the wearers of the purple. To Karl it was the sudden realization of his dreams. He was one of them. He, too, should be wearing the purple. Then his heart sank as one of his guards prodded him into action. His dream already was shattered for they stood at the entrance to a great crystal pyramid that rose from the flat expanse of the roofs of Dorn. It was the palace of the Zar.

It seemed then that fairyland had opened its gates to the young man in gray denim. He immediately fell under its influence when they traversed a long lane between rows of brightly colored growing things which filled the air with sweet odors. Feathered creatures fluttered about and twittered and caroled in the sheer joy of being alive. It was sweeter music than he had ever believed possible or even imagined as existing.

Again he forgot the menace of the imperial edict which had brought him from the other side of the world.

Then rudely, he was brought back to earth. He was in the presence of the mighty Zar and his three escorts were bowing themselves from the huge room in which the wizened monarch sat enthroned. They had finished their duties.

A shriveled face; beady eyes; trembling hands with abnormally large knuckles; a cruel and determined mouth--these were the features that most impressed Karl as he stared wordlessly at this Zar of the Eastern Hemisphere. The magnificence of the royal robe was lost on the young wearer of the gray.

"Well, well, so this is Peter Van Dorn, my beloved nephew." The Zar was speaking and the chilly sarcasm in which the words were uttered belied the friendliness they otherwise might have implied.

"That's what I'm told," replied Karl, "though I didn't know I'm supposed to be the nephew of so great a figure as yourself."

Not bad that, for an humble wearer of the gray.

"Oh, yes, yes, indeed. Why else should I have sent for you?"

"I have wondered why--and still wonder."

"Oh, you wonder, eh?" The Zar inspected him carefully and then broke into a cackle of horrible laughter. "A Van Dorn in gray denim!" he chortled. "A mole of the Americas! And to think that even the Zar has been unable to find him in all these years!"

"Stop!" bellowed Karl. "I'll not have your ridicule. Come to the point now and have it over with. Kill me if you will, but tell me the story!"

He had seen the slender tube in the Zar's hand.

An expression of surprise, almost of admiration, flickered in the beady eyes of the Zar and was gone. He spoke coldly.

"Very well, I shall explain. You, Peter, are actually my nephew. Your father, Derek Van Dorn, was my brother; he a king of Belravia and I a poor but experienced scientist. He scorned me and he paid, for I learned of the ancient race of the other side of the Moon, the side we can not see from the earth. I went to them and enlisted their aid in warring upon my brother. When we returned to carry on this war I learned that I had a son. So, too, did Derek. But my son was born in obscurity and Derek's son--you, Peter--in the lap of luxury. The war was short and, to me, sweet. Belravia was first to fall, and I had your father removed from this life by the vibrating death."

"You monster!" cried Karl. But the slender rod menaced him.

"A moment, my hot-headed nephew. I vowed I'd have your life, Peter, but your father had a few friends and one of these spirited you away. So temporarily you escaped. But now I have you where I can keep that vow.

You, too, shall die. By the vibration. But first--ha! ha!--I'll give you a taste of the purple. Just so the going will be harder."

Karl kept his temper as best he could. He thought, conscience-stricken, of old Rudolph, that good friend of his father. Then he thought of that youth he had taken from the Square.