Tom had been here many times before, and always he gasped in wonder when he saw the awesome beauty of the thing. Stepping into the Map Room was like stepping into the center of a huge cathedral. Here was the glowing, moving panorama of the Solar System spread out before him in a breath-taking three-dimensional image. Standing here before the Map it seemed as if he had suddenly become enormous and omnipotent, hanging suspended in the blackness of space and staring down at the Solar System from a vantage point a million miles away. Once, Dad had told him, there had been a great statue in the harbor of Old New York which had been a symbol of freedom for strangers coming to that city from across the sea, and a welcome for countrymen returning home. And someday, he knew, this view of the Solar System would be waiting to greet Earthmen making their way home from distant stars. The Map was only an image, a gift from the United Nations to the colonists on Mars, but it reproduced the Solar System in the minutest detail that astronomers could make possible. In the center, glowing like a thing alive, was the Sun, the hub of the magnificent wheel. Around it, moving constantly in their orbits, were the planets, bright points of light on the velvet blackness of the screen. Each orbit was computed and held on the screen by the great computer in the vault below. But there was more on the Map than the Sun and the planets, with their satellites. Tiny green lights marked the Earth-Mars and the Earth-Venus orbit-ships, moving slowly across the screen. Beyond Mars, a myriad of tiny lights projected on the screen, the asteroids. Without the magnifier Tom could identify the larger ones ... Ceres, on the opposite side of the Sun from Mars now as it moved in its orbit; smaller Juno, and Pallas, and Vesta.... For each asteroid which had been identified, and its orbit plotted, there was a pinpoint of light on the screen. For all its beauty, the Map had a very useful purpose ... the registry and identification of asteroid claims among the miners of Mars. Each asteroid registered as a claim showed up as a red pinpoint; unclaimed asteroids were white. But even with the advances of modern astronomy only a small percentage of the existing asteroids were on the map, for the vast majority had never been plotted. Tom moved up to the Map and activated the magnifier. Carefully he focussed down on the section of the Asteroid Belt they had visited so recently. Dozens of pinpoints sprang to view, both red and white, and beneath each red light the claim-number neatly registered. Tom peered at the section, searching until he found the number of Roger Hunter's last claim. It was quite by itself, not a part of an asteroid cluster. He stepped up the magnification, peered at it closely. There were a dozen other pinpoints, all unclaimed, within a ten-thousand-mile radius.... But near it, nothing.... No hiding place.