And then he found them on channel eight.

"-ignificant acceleration in the pace of research," she was saying.

And the Professor said, "What?"

Professor Johnston looked over his wire-frame spectacles at the woman standing before him. "That's impossible," he said.

She took a deep breath. "Perhaps I haven't explained it very well. You are already doing some reconstruction. What Bob would like to do," she said, "is to enlarge that to be a full program of reconstruction."

"Yes. And that's impossible."

"Tell me why."

"Because we don't know enough, that's why," Johnston said angrily. "Look: the only reconstruction we've done so far has been for safety. We've rebuilt walls so they don't fall on our researchers. But we're not ready to actually begin rebuilding the site itself."

"But surely a part," she said. "I mean, look at the monastery over there. You could certainly rebuild the church, and the cloister beside it, and the refectory, and-"

"What?" Johnston said. "The refectory?" The refectory was the dining room where the monks took their meals. Johnston pointed down at the site, where low walls and crisscrossing trenches made a confusing pattern. "Who said the refectory was next to the cloister?"

"Well, I-"

"You see? This is exactly my point," Johnston said. "We still aren't sure where the refectory is yet. It's only just recently that we've started to think it might be next to the cloister, but we aren't sure."

She said irritably, "Professor, academic study can go on indefinitely, but in the real world of results-"

"I'm all for results," Johnston said. "But the whole point of a dig like this is that we don't repeat the mistakes of the past. A hundred years ago, an architect named Viollet-le-Duc rebuilt monuments all over France. Some he did well. But when he didn't have enough information, he just made it up. The buildings were just his fantasy."

"I understand you want to be accurate-"

"If I knew ITC wanted Disneyland, I'd never have agreed."

"We don't want Disneyland."

"If you rebuild now, that's what you'll get, Ms. Kramer. You'll get a fantasy. Medieval Land."

"No," she said. "I can assure you in the strongest possible terms. We do not want a fantasy. We want an historically accurate reconstruction of the site."

"But it can't be done."

"We believe it can."

"How?"

"With all due respect, Professor, you're being overcautious. You know more than you think you do. For example, the town of Castelgard, beneath the castle itself. That could certainly be rebuilt."

"I suppose… Part of it could, yes."

"And that's all we're asking. Just to rebuild a part."

David Stern wandered out of the storehouse, to find Chris listening with the radio pressed to his ear. "Eavesdropping, Chris?"

"Shhh," Chris said. "This is important."

Stern shrugged his shoulders. He always felt a little detached from the enthusiasms of the graduate students around him. The others were historians, but Stern was trained as a physicist, and he tended to see things differently. He just couldn't get very excited about finding another medieval hearth, or a few bones from a burial site. In any case, Stern had only taken this job - which required him to run the electronic equipment, do various chemical analyses, carbon dating, and so on - to be near his girlfriend, who was attending summer school in Toulouse. He had been intrigued by the idea of quantum dating, but so far the equipment had failed to work.

On the radio, Kramer was saying, "And if you rebuild part of the town, then you could also rebuild part of the outer castle wall, where it is adjacent to the town. That section there." She was pointing to a low, ragged wall running north-south across the site.

The Professor said, "Well, I suppose we could…"

"And," Kramer continued, "you could extend the wall to the south, where it goes into the woods over there. You could clear the woods, and rebuild the tower."

Stern and Chris looked at each other.

"What's she talking about?" Stern said. "What tower?"

"Nobody's even surveyed the woods yet," Chris said. "We were going to clear it at the end of the summer, and then have it surveyed in the fall."

Over the radio, they heard the Professor say, "Your proposal is very interesting, Ms. Kramer. Let me discuss it with the others, and we'll meet again at lunch."

And then in the field below, Chris saw the Professor turn, look directly at them, and point a stabbing finger toward the woods.

Leaving the open field of ruins behind, they climbed a green embankment, and entered the woods. The trees were slender, but they grew close together, and beneath their canopy it was dark and cool. Chris Hughes followed the old outer castle wall as it diminished progressively from a waist-high wall to a low outcrop of stones, and then finally to nothing, disappearing beneath the underbrush.

From then on, he had to bend over, pushing aside the ferns and small plants with his hands in order to see the path of the wall.

The woods grew thicker around them. He felt a sense of peace here. He remembered that when he had first seen Castelgard, nearly the entire site had been within forest like this. The few standing walls were covered in moss and lichen, and seemed to emerge from the earth like organic forms. There had been a mystery to the site back then. But that had been lost once they cleared the land and began excavations.

Stern trailed along behind him. Stern didn't get out of the lab much, and he seemed to be enjoying it. "Why are all the trees so small?" he said.

"Because it's a new forest," Chris said. "Nearly all the forests in the Périgord are less than a hundred years old. All this land used to be cleared, for vineyards."

"And?"

Chris shrugged. "Disease. That blight, phylloxera, killed all the vines around the turn of the century. And the forest grew back." And he added, "The French wine industry almost vanished. They were saved by importing vines that were phylloxera-resistant, from California. Something they'd rather forget."

As he talked, he continued looking at the ground, finding a piece of stone here and there, just enough to enable him to follow the line of the old wall.

But suddenly, the wall was gone. He'd lost it entirely. Now he would have to double back, pick it up again.

"Damn."

"What?" Stern said.

"I can't find the wall. It was running right this way" - he pointed with the flat of his hand-" and now it's gone."

They were standing in an area of particularly thick undergrowth, high ferns intermixed with some kind of thorny vine that scratched at his bare legs. Stern was wearing trousers, and he walked forward, saying, "I don't know, Chris, it's got to be around here… ."

Chris knew he had to double back. He had just turned to retrace his steps when he heard Stern yell.

Chris looked back.

Stern was gone. Vanished.

Chris was standing alone in the woods.

"David?"

A groan. "Ah… damn."

"What happened?"

"I banged my knee. It hurts like a mother."

Chris couldn't see him anywhere. "Where are you?"

"In a hole," Stern said. "I fell. Be careful, if you come this way. In fact…" A grunt. Swearing. "Don't bother. I can stand. I'm okay. In fact - hey."

"What?"

"Wait a minute."

"What is it?"

"Just wait, okay?"

Chris saw the underbrush move, the ferns shifting back and forth, as Stern headed to the left. Then Stern spoke. His voice sounded odd. "Uh, Chris?"

"What is it?"

"It's a section of wall. Curved."

"What are you saying?"

"I think I'm standing at the bottom of what was once a round tower, Chris."

"No kidding," Chris said. He thought, How did Kramer know about that?

"Check the computer," the Professor said. "See if we have any helicopter survey scans - infrared or radar - that show a tower. It may already be recorded, and we just never paid attention to it."