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.