When Sime awoke it was to the rattling of the door. Murray stirred. The light was even weaker than before.

“If they offer you a drink, drink hearty!” Murray muttered, sitting up. “I’ve got an idea it’s going to be a hard day.”

But they were not offered any water. Instead they were again conducted before Scar Balta, who looked at them morosely. At last he remarked gruffly:

“If you tin sojers weren’t so cursed stubborn, you could get yourself a nice berth in the Martian army. Ever consider that?”

“Talk sense!” Sime said contemptously. “If I threw down the service how could you trust me?”

“That’d be easy,” Balta rejoined. “Once the I. F. P. finds out you joined us you’d have to stick with us to save your skin.”

He laughed at his prisoners’ look of surprise.

“Come, come!” he bantered. “You didn’t think that I was ignorant of your purpose here? You, Murray; your spying was excellent, I’ll admit. You were the first to give away certain plans of ours. Well, well! We don’t hold that against you. Wheels within wheels, eh? It would perhaps astonish certain braided gentleman of our high command to learn that I, a mere colonel, control their destinies. As our ancestors would say, it’s dog eat dog.

“Now, how about it? I can make a place for you in my organization. It seems to run to secret service, oddly enough. You will be rewarded far beyond anything you could expect in your present career of chasing petty crooks from Mercury to Pluto and back again.”

“Is that all?” Murray asked softly, with a bearded grin.

“Oh no. You will turn over to me all the information you can about the I. F. P. helio code. You will name and describe to me each and every plainclothes operative of the service and you should have an extensive acquaintance.”

“Before you answer,” Murray said quietly at Sime’s side, “let me suggest that you consider what’s in store for us or you if you don’t take up this offer.”

“Why, you ” Sime whirled in astonished fury upon his companion. “Didn’t you ”

But he did not complete his reference to last night’s surreptitious conversation. It seemed that he saw the merest ghost of a flicker in Murray’s left eye.

“ Didn’t you say you’d stick no matter what they did?” he finished lamely.

Murray hung his head.

“I’m getting along,” he muttered. “Not as young as I used to be. This life is getting me nowhere. Why be a fool? Come along with me!”

“Why, you dirty, double-crossing hound!” Sime’s exasperation knew no bounds. For an instant he had believed that Murray was enacting a little side-play in the pursuit of a suddenly conceived plan. But he looked so obviously hangdog so guiltily defiant....

Crack! Sime’s fist struck Murray’s solid jaw, scraping the skin off his knuckles, but Murray swayed to the blow, sapping its force, and came in to clinch. They rolled on the floor. Murray twisted Sime’s head painfully, bit his ear. But in the next split second he was whispering:

“Keep your head, Sime. Can’t you see I’m stringing him? Take that!” And he planted a vicious short hook to Sime’s midriff.

Balta had squalled orders, and now Martian soldiers were bursting the buttons off their uniforms in the scrimmage to separate the battlers. Bruised and battered, they were dragged apart. Murray’s one eye was now authentically closed, and rapidly coloring up. Unsteadily he got to his feet. With mock delicacy he threw a kiss to his late antagonist.

“Farewell, Trueheart!” He bowed ironically, and the men all laughed.

Balta grinned too. “Still the same mind, Hemingway? All right, men, take him up to the observation post. Here, Murray, have a drink.”

Sime was led up a seemingly endless circular staircase. After an interminable climb he saw the purplish Martian sky through the glass doors of an airlock. Then they were outside, in the rarefied atmosphere that sorely tried Sime’s lungs, still laboring after the fight and long ascent. The Sun, smaller than on Earth but intensely bright, struck down vindictively.

“A good place to see the country,” laughed the corporal in charge. “Off with his clothes!”

It was but a matter of seconds to strip Sime’s garment from him. They dragged him to an upright post, one of several on the roof, and with his back to the post, tied his wrists behind it with rawhide. His ankles they also tied, and so left him.

It was indeed an excellent point of vantage from which to see the country. The fortress was high enough to clear the nearby cliffs of low elevation, and on all sides the Gray Mountains tumbled to the horizon. To the north, beyond that sharply cut, ragged horizon, lay the big cities, the industrial heart of the planet. To the south, at Sime’s back, was the narrow agricultural belt, the region of small seas, of bitter lakes, of controlled irrigation. Here the canals, natural fissures long observed by astronomers and at first believed to be artificial, were actually put to the use specified by ancient conjecture, just as further north they had been preempted as causeways of civilization. Sime painfully worked his way around the post so that he could look south. But here too nothing met his eye but the orange cliffs with their patches of gray lichen. There was no comfort to be had in that desolate landscape. Nevertheless, Sime kept moving around, to keep the post between himself and the Sun. Already it was beginning to scorch his skin uncomfortably.

By the time it was directly overhead Sime had stopped sweating. The dry atmosphere was sucking the moisture out of his body greedily, and his skin was burned red. His suffering was acute.

The Martian day is only a little more than a day on Earth, but to Sime that afternoon seemed like an eternity. Small and vicious, with deadly deliberation, the sun burned its way down a reluctant groove in the purple heavens. Long before it reached the horizon, Sime was almost unconscious. He did not see its sudden dive into the saw-edge of the western mountains knew only that night had come by the icy whistle of the sunset wind that stirred and moaned for a brief interval among the rocks. The keen, thin wind that first brought relief and then new tortures, to be followed by freezing numbness.

Above, in the blackness, the stars burned malignantly. Drug to his misery they were, those familiar constellations, which are about the only things that look the same on all planets of the solar system. But they were not friendly. They seemed to mock the motionless human figure, so tiny, so inconsequential, that stared at them, numerous tiny pinpricks of light, so remote.

There was no dawn, but after aeons Sime saw the familiar green disk of Earth coming up in the east, one of the brightest stars. Sime fancied he saw the tiny light flick of the moon. There would be a game of blackjack going on somewhere there about now. He groaned. The Sun would not be far behind now.

But he must have slept. The Sun was up before he was aware of it. A man with a caduceus on his blouse collar was holding his wrist, feeling his pulse. He seemed to be a medical officer of the Martian army. His smooth, coral face was serious as he prodded Sime’s shriveled tongue.

“Water, quick!” he snapped, “or he’s done for.”

His head was tipped back and water poured into his mouth, but Sime could not swallow. The soldier with the bucket poured dutifully, however, almost drowning the helpless man. It helped, anyway; and Sime returned to half-consciousness. A few minutes later, when Scar Balta came to inquire if he had changed his mind, Sime was able to curse thickly. And around noon, when Murray, jauntily dressed in the uniform of a Martian captain, bid him a cheerful good-by, Sime was almost fluent.

His torture had now reached the pitch of exquisite keenness that made it something spiritual. Solicitously they kept him alive, and far back in his mind Sime wondered why they bothered to do that. Couldn’t they be satisfied with what they could learn from Murray?

So passed the second day, and the third.

On the fourth day Sime was able to drink water freely, and to eat the food they placed into his mouth, a fact which the medical officer noted. The torture was wearing itself out. Sime’s body was emaciated, stringy, burnt black. But his extraordinary toughness was weathering conditions that would kill most men. Balta shook his head in wonderment when this was reported to him.

“Can’t wait any longer for him. Must get back to Tarog. You might as well put him out of his misery. By the way, I’m convinced that Murray is double-timing me. But I’ll attend to that personally.”

From his post of pain Sime saw the official car leave toward Tarog. Had he known of Balta’s remark he would not have been puzzled so much by what he saw.

As the ship was about to disappear over the ragged northern horizon, Sime’s bleared eyes saw, or he thought they saw, a human figure silhouetted against the pitiless sky. It was a tiny-seeming figure at that distance, but it was clear-cut in the rare atmosphere. Then it plunged from sight.

“Somebody taken for a ride,” he muttered, half grateful for the brief distraction from his own misery.

The medical officer, to whom the long climb was arduous, delayed his mission to the roof, and that was why, several hours later, Sime was still alive to see another ship appear to the north. It was large, sumptuous, evidently a private yacht. Its course would bring it within a mile of the fortress, and with sudden wild hope Sime realized that if he were seen he might expect relief. He began to tug at his bonds. They were tough, but they would stretch a little. His haphazard movements had already worn them against the rough post, and now he began to struggle violently. If he could only get his hands loose, he could wave....

The thongs cut into his flesh, but his wrists were numb and swollen, and he did not mind the pain. His muscles stood out hard and sharp, and with a supreme effort, aided by the growing brittleness of the rawhide in the dry atmosphere, he snapped his bonds.

The ship was now quite near, and he waved frantically. He fancied he saw movement back of the pilot ports. Faintly he heard the hum of the levitators. Now it turned no! It yawed, now toward him, now away, purposelessly, like a ship in distress. It made an abrupt downward plunge that scraped a crag, and just missed a canyon wall.

Again it twisted, came down with a long, twisting motion, struck a rock upside down, slitting a long gash in its skin, clattered to the rocks so close to the fortress that Sime could not see it. Now desperation gave the prisoner superhuman strength. Regardless of the pain, he burst the thongs about his ankles, tottered to the edge of the roof.

There was a battle going on below. Men seemed to be running, shouting. Someone, using a massive plate of metal as a partial shield against the neuro-pistols, was creating havoc. Sime tried to focus his giddy eyes on the scene. It seemed always to be turning to the left, to be circling around him. With tottering steps he tried to follow it, keeping to the brink of that lofty tower uselessly. Now it was rocking, flying straight toward him, and, gratefully, Sime gave up the struggle, closed his eyes.