title="[10]"/> himself after locking the door again. The name was not unusual and did not bring any familiar associations to his mind. The given name, Scar, once a nickname, had been in general use for centuries. As for Balta—oh, well—

His mind reverted to the girl again. Her warm, palpitant presence disturbed him.

He composed himself to sleep, strapping his dispatch belt around his waist before crawling into bed. He did not believe that the girl had hidden in his room with murderous intent; rather that she had hoped to inspect and perhaps to steal any papers that he carried. But his last conscious thought of her had nothing to do with her connection with this planet of intrigue, but the soft curve of her throat.

CHAPTER II

Scar Balta

Sime breakfasted on one of the juicy Martian tropical pears, and as he dug into the luscious fruit with his spoon he looked about the spacious dining hall, filled with wide-eyed tourists on their first trip to Mars, blissful and oblivious honeymooners, and a sprinkling of local residents and officials.

Through broad windows of thick glass (for on Mars many buildings maintain an atmospheric pressure somewhat higher than the normal outside pressure) could be seen the north banks of the canal, teeming with swift pleasure boats and heavily loaded work barges. Down the long terraces strolled hundreds of people, dressed in garments of vivid colors and sheer materials suitable to the hot and cloudless days. Brilliant insects floated on wide diaphanous wings, waiting to pounce on the opening blossoms.

But the terrestrial agent felt that in this scene of luxury there was a menace. Out of sight, but instantly available, were frightful engines of destruction, waiting to be mobilized against the Earth branch of the human race. And on that distant green planet were people much like these, unconscious still of the butchery into which they were being deftly maneuvered by calculating psychologists, expert war-makers.

His meal completed, Sime sauntered out into the wide, clean streets of North Tarog. He purchased a desert unionall suit, proof against the heat of day and cold of night, and a wide-brimmed Martian pith helmet. Hailing a taxi, he relaxed comfortably in the cushions.

"Nabar mine," he told the driver.

The driver nosed the vehicle up, over the domed roofs of the city and over the harsh desert landscape. The rounded prow cut through the thin air with a faint whistling, and the fair cultivated area along the canal was soon lost to sight.

After half an hour the metal mine sheds grew out of the horizon. But even from a distance of several miles Sime could see that everything was not as it should be. There were no moving white specks of the laborers' white fatigue uniforms against the brown rocks, and no clouds of dust from the borium refuse pile.

The levitator screws of the taxi sank from their high whine to a groan, and the wheels came to the ground before the company office. A man in the Martian army uniform came out. His beetle-browed face was truculent, and his hand rested on the hilt of his neuro-pistol.

"No visitors allowed!" snapped the guard.

"I'm not exactly a visitor," Sime objected, but making no move to get out of the taxi. "I'm an engineer sent here by the board of directors to see why the output of this mine has dropped. Where's Mr. Murray?"

"All settled!" the guard retorted. "Murray's in jail for mismanagement of planetary resources, and the mine's been expropriated to the government. Now, you—off!"

The driver needed no further order from his fare. The taxi leaped into the air and tore back toward the city. It was clear that the military rules of Mars brooked no nonsense from the civilian population, and that the latter were well aware of it.

"Fast work!" Sime said to himself with grudging admiration. Murray was a trusted agent of the terrestrial government. It was he who had first uncovered the war cabal. Sime knew his face well from the stereoscopic service record—a bald, placid man of about forty, a bonafide engineer, a spy with an unbroken record of success, until now. And a fighter who asked no odds, who could manage very well on less than an even break. Well, he was up against something now.

They passed the line of shield-ray projectors, North Tarog's first line of defense against an attack of space, hovered over the teeming streets and parks, and settled on the pavement at the Hotel of the Republic. Sime wanted to go to his room and think things over.

From the concealment of a doorway an officer with a squad of soldiers came up quickly.

"You are under arrest!" said the officer, placing, his hand on Sime's shoulder, while the soldiers rested their hands on their neuro-pistols.

"Would it be asking too much to inquire on what charge?" Sime asked politely.

"Military arrests do not require the filing of charges," the officer explained stiffly. "Come out of there now, Mr. Hemingway."

"I demand to see the terrestrial consul," Sime said, getting out.

"How about my fare?" asked the taxi-driver.

Sime put his hand into his pocket, where he kept a roll of interplanetary script; but the officer restrained him.

"Never mind now," he said ironically. "You are a guest of the government." Then to the driver he added:

"Get on, now! Get on! File your claim at the divisional office."

The driver departed, outwardly meek before the power of the military, and Sime was hustled into an official car. He had little hope that his demand to see the terrestrial consul would be complied with, and this opinion was verified when the car rose into the air and sped over the waters of the canal to South Tarog. It did not pause when it came over the military camps there—the massive ordnance depots in which were stored new and improved killing tools that had long been idle in that irksome interplanetary peace.

They flew on, over the desert, until the Gray Mountains loomed on the horizon. On, over the tumbled rocks, interspersed with the strange red thorny vegetation common in the Martian desert.

Far below them, in a ravine, a cylindrical building was now visible, and toward this the car began to drop. It landed on a level space before the structure. A sliding gate opened, and the car wheeled into a sort of courtyard, protected from the cold of night by an arching roof of glass.

Sime was hustled out and led into an office located on the lower floor of the fortification, or whatever the structure was.

As he saw the man who sat at the desk he gave a startled explanation.

"Colonel Barkins!"

The elderly, white-haired man smiled. He brushed back his hair with a characteristic gesture, and his twinkling blue eyes bored into those of the I. F. P. special officer. The colonel wore the regular uniform of the service; his little skullcap, with the conventionalized sun symbol denoting his rank, was on the table before him. He put out his lean, strong hand.

"Surprised to see me, eh, Hemingway?" he inquired pleasantly.

Sime managed an awkward salute. "I don't quite understand, sir. You gave me my instructions at the Philadelphia space port just before I made the Pleadisia. She's the fastest passenger liner in the solar system: I've barely landed here, and it seems you got here before me. It don't seem right!"

Sime watched the colonel narrowly, a vague suspicion in his mind, and he thought he saw a slight flicker in the man's eye when Sime spoke.

But the colonel answered smoothly, with a hint of reproof.

"Never mind questioning