Then why not disappear several days earlier, so that Miran could have time to reload his cargo? He'd see the merchant tomorrow. If Miran fell in with his plans, Green would disappear four nights from this very night, which would leave three days for the windroller to be emptied and reloaded. Fortunately the tanks wouldn't have to be taken off, because any fool could see that the runaway wasn't hiding at the bottom among the fish. Much relieved that he at least had a way open, if a very perilous one, Green relaxed. He was sitting on a bench along a walk on top of one of the castle walls. The sky was blazingly beautiful with stars larger than any seen from Earth. The great moon and the small moon had risen. The larger had just cleared the eastern horizon and the lesser one was just past the zenith. Mingled moonwash and starwash softened the grimness and ugliness of the city below him and laved it in a flood of romance and glamour. Most of Quotz was unlighted, for the streets had no lamps and the windows were shut up tight against thieves, vampires and demons. Occasionally the torchflares of the servants of a drunken noble or rich man moved down the dark canyons between the towering overhanging houses. Beyond the city was the amphitheater formed by the hills curving out to the north and the great brick wall built to continue the natural windbreak. A wide opening had been left so that the 'rollers, their sails furled, could be towed in or out. Past this the great plain suddenly began, as if the hand of some immense landscaper had pressed the hills flat and declared that from here on there would be no unevennesses. Westward lay the incredibly level stretch of the grassy ground of the Xurdimur. Ten thousand miles straight across, flat as a table top, broken only here and there by clumps of forests, ruins of cities, waterholes, the tents of the nomadic savages, herds of wild animals, packs of grass cats and dire dogs, and the mysterious and undoubtedly imaginary "roaming islands," great clumps of rock and dirt that legend said slid of their own volition over the plains. How like this planet, he thought, that the greatest peril to navigation should be one that existed only in the heads of the inhabitants. The Xurdimur was a fabulous phenomenon, without parallel. On none of the many planets that Earthmen had discovered was there anything similar. How, he wondered, could the plain keep its smoothness, when there was always dirt running on to it from the eroding hills and mountains that ringed it? The rains, too, should have done much to wear it away unevenly. Of course, the grass that grew all over it was long and had very tough roots. And if what he had been told was true, beneath the vegetation was one mass of inextricably tangled roots that held the soil together.