"Ah," said the dwarf, eyes gleaming. "It is that this valley is choked with sand—something blocks it there—" he pointed at the far end. "The side rock goes down, very far below this; I feel it meet under our feet."

"Find us firm ground," said High Marshal Connaught to the scout. "These horses can't handle boggy—" He threw himself off as his horse sank hock-deep by one leg. They all dismounted. Close up the valley was smaller than they had thought; its hills were low dunes rising above the level, its stream only a trickle across the sand surface. "But plenty if we dig," the High Marshal assured the others. "It's like those waterholes in the low desert."

While the scout and several men-at-arms searched for a firm path to the north end of the valley, the Marshals and knights looked at the angled canyon that wound away to the right. That way the ground seemed firmer, and the little stream, though narrower, gurgled ankle deep over fine gravel.

"It's too bad we aren't going this way," said High Marshal Fallis. "I suppose it's blocked at the far end by another cliff."

"Let's look at it," said Marek, one of the knights, and the only member of the Order of Gird. "We ought to learn the shape of the land, in case of trouble."

"In case of trouble," said Joris dryly, "nothing in this land offers comfort. We should have been born with wings."

"I agree with Marek, though," said Connaught. "We should know, and mark the map."

They set off on foot, the High Marshals, Amberion and Paks, the knights, and Ardfiel and Balkon. In a few minutes an angle of rock cut them off from sight of the others. On either hand the cliffs rose straight out of the sand, as if carved by a knife. Paks noticed a great arch set into the northeast wall. Under it a dark shadowed space looked large enough for a building. She looked from cliff to cliff, uneasy. In several places the stone seemed to have broken away leaving an overhanging arch, some much smaller than others. She nudged Balkon.

"Why does the rock do that? Is it natural? Did something shape it?"

"What—oh, it is the arch you mean? That is stone itself. I have not seen before, but I have heard. It is good stone that can take an arch; the arch is the drossen shape—" He saw her puzzled look, sighed, and tried in Common. "The shape that stone holds when it is sound—strong—healthy. Not nedross, like that stone that we came by, where the wall broke to let us in. Look in the High Lord's Hall—you see that even human masons know the right shape, the good shape, for stone holding stone. The longer the arch, the better the stone."