Harold Tate told him, and later, when Syme had taken him to his rooms, he showed him what was in his little black suitcase. Syme had been right; it was big.
Kal-Jmar was the riddle of the Solar System. It was the only remaining city of the ancient Martian race—the race that, legends said, had risen to greater heights than any other Solar culture. The machines, the artifacts, the records of the Martians were all there, perfectly preserved inside the city's bubble-like dome, after God knew how many thousands of years. But they couldn't be reached.
For Kal-Jmar's dome was not the thing of steelite that protected Lillis: it was a tenuous, globular field of force that defied analysis as it defied explosives and diamond drills. The field extended both above and below the ground, and tunneling was of no avail. No one knew what had happened to the Martians, whether they were the ancestors of the present decadent Martian race, or a different species. No one knew anything about them or about Kal-Jmar.
In the early days, when the conquest of Mars was just beginning, Earth scientists had been wild to get into the city. They had observed it from every angle, taken photographs of its architecture and the robots that still patrolled its fantastically winding streets, and then they had tried everything they knew to pierce the wall.
Later, however, when every unsuccessful attempt had precipitated a bloody uprising of the present-day Martians—resulting in a rapid dwindling of the number of Martians—the Mars Protectorate had stepped in and forbidden any further experiments; forbidden, in fact, any Earthman to go near the place.
Thus matter had stood for over a hundred years, until Harold Tate. Tate, a physicist, had stumbled on a field that seemed to be identical in properties to the Kal-Jmar dome; and what is more, he had found a force that would break it down.
And so he had made his first trip to Mars, and within twenty-four hours, by the blindest of chances, blurted out his secret to Syme Rector, the scourge of the spaceways, the man with a thousand credits on his sleek, tigerish head.
Syme's smile was not tigerish now; it was carefully, studiedly mild. For Tate was no longer drunk, and it was important that it should not occur to him that he had been indiscreet.
"This is native territory we're coming to, Harold," he said. "Better strap on your gun."