They followed the ledge road to a section where a landslide of an earlier season had choked it. Travis worked a careful way across the debris, Kaydessa obeying his guidance in turn. Then they were on a sloping downward way which led to a staircase--the treads weather-worn and crumbling, the angle so steep Travis wondered if it had ever been intended for beings with a physique approximating the Terrans'. They came to a cleft where an arch of stone was chiseled out as a roofing. Travis thought he could make out a trace of carving on the capstone, so worn by years and weather that it was now only a faint shadow of design. The cleft was a door into another valley. Here, too, golden mist swirled in tendrils to disguise and cloak what stood there. Travis had found his ruins. Only the structures were intact, not breached by time. Mist flowed in lapping tongues back and forth, confusing outlines, now shuttering, now baring oval windows which were spaced in diamonds of four on round tower surfaces. There were no visible cracks, no cloaking of climbing vegetation, nothing to suggest age and long roots in the valley. Nor did the architecture he could view match any he had seen on those other worlds. Travis strode away from the cleft doorway. Under his moccasins was a block pavement, yellow and green stone set in a simple pattern of checks. This, too, was level, unchipped and undisturbed, save for a drift or two of soil driven in by the wind. And nowhere could he see any vegetation. The towers were of the same green stone as half the pavement blocks, a glassy green which made him think of jade--if jade could be mined in such quantities as these five-story towers demanded. Nalik'ideyu padded to him, and he could hear the faint click of her claws on the pavement. There was a deep silence in this place, as if the air itself swallowed and digested all sound. The wind which had been with them all the day of their journeying was left beyond the cleft. Yet there was life here. The coyote told him that in her own way. She had not made up her mind concerning that life--wariness and curiosity warred in her now as her pointed muzzle lifted toward the windows overhead. The windows were all well above ground level, but there was no opening in the first stories as far as Travis could see. He debated moving into the range of those windows to investigate the far side of the towers for doorways. The mist and the message from Nalik'ideyu nourished his suspicions. Out in the open he would be too good a target for whatever or whoever might be standing within the deep-welled frames. The silence was shattered by a boom. Travis jumped, slewed half around, knife in hand. Boom-boom ... a second heavy beat-beat ... then a clangor with a swelling echo. Kaydessa flung back her head and called, her voice rising up as if tunneled by the valley walls. She then whistled as she had done when they fronted the ape-thing and ran on to catch at Travis' sleeve, her face eager.