The Andre Norton Megapack - 15 Classic Novels and Short Stories

about the river, it must follow that their camp lay on the outskirts of the metropolis.
    He pulled himself out of the water. Bow and arrows had been left behind with the last merman; he had only his sword-knife for protection. But he was not there to fight, only to watch and wait. Pressing the excess moisture out of his scant clothing, he crept along the shore. If the strangers were using the streets, it might be well to get above them. Speculatively he eyed the buildings about him as he entered the city.
    Dalgard continued to keep at street level for two blocks, darting from doorway to shadowed doorway, alert not only to any sound but to any flicker of thought. He was reasonably sure, however, that the aliens would be watching and seeking only for the merpeople. Though they were not telepathic as their former slaves, Those Others were able to sense the near presence of a merman, so that the sea people dared not communicate while within danger range of the aliens without betraying themselves. It was the fact that he was of a different species, therefore possibly immune to such detection, which had brought Dalgard into the city.
    He studied the buildings ahead. Among them was a cone-shaped structure which might have been the base of a tower that had had all stories above the third summarily amputated. It was ornamented with a series of bands in high relief, bands bearing the color script of the aliens. This was the nearest answer to his problem. However the scout did not move toward it until after a long moment of both visual and mental inspection of his surroundings. But that inspection did not reach some twelve streets away where another crouched to watch. Dalgard ran lightly to the tower at the same moment that Raf shifted his weight from one foot to the other behind a parapet as he spied upon the knot of aliens gathered below him in the street. . . .
    The pilot had followed them since that early morning hour when Soriki had awakened him. Not that the chase had led him far in distance. Most of the time he had spent in waiting just as he was doing now. At first he had believed that they were searching for something, for they had ventured into several buildings, each time to emerge conferring, only to hunt out another and invade it. Since they always returned with empty hands, he could not believe that they were out for further loot. Also they moved with more confidence than they had shown the day before. That confidence led Raf to climb above them so that he could watch them with less chance of being seen in return.
    It had been almost noon when they had at last come into this section. If two of them had not remained idling on the street as the long moments crept by, he would have believed that they had given him the slip, that he was now a cat watching a deserted mouse hole. But at the moment they were coming back, carrying something.
    Raf leaned as far over the parapet as he dared, trying to catch a better look at the flat, boxlike object two of them had deposited on the pavement. Whatever it was either needed some adjustment or they were attempting to open it with poor success, for they had been busied about it for what seemed an unusually long time. The pilot licked dry lips and wondered what would happen if he swung down there and just walked in for a look-see. That idea was hardening into resolution when suddenly the group below drew quickly apart, leaving the box sitting alone as they formed a circle about it.
    There was a puff of white vapor, a protesting squawk, and the thing began to rise in jerks as if some giant in the sky was pulling at it spasmodically. Raf jumped back. Before he could return to his vantage point, he saw it rise above the edge of the parapet, reach a level five or six feet above his head, hovering there. It no longer climbed; instead it began to swing back and forth, describing in each swing a wider stretch of space.
    Back and forth—watching it closely made him almost dizzy. What was its purpose? Was it a detection device, to locate him? Raf’s hand went to his stun gun. What effect its rays might have on the box he had no way of knowing, but at that moment he was sorely tempted to try the beam out, with the oscillating machine as his target.
    The motion of the floating black thing became less violent, its swoop smoother as if some long-idle motor was now working more as its builders had intended it to perform. The swing made wide circles, graceful glides as the thing explored