Timeline

It went on interminably. Listening to the lyrics, she thought: This is "Ninety-nine Bottles of Beer on the Wall." And sure enough, as she raised her head to look, she saw half a dozen soldiers in green and black sitting around a fire, drinking and singing loudly. Perhaps they had been ordered to make enough noise to justify all the fires.

Marek pointed for them to go back, and when they had moved a distance away, he led them off to the left, away from the river. They left behind the cover of trees that lined the river, then were again slipping through open, cleared fields. She realized that these were the same fields where she had been that morning. And sure enough, now she could see on the left faint yellow lights in the upper windows of the monastery as some of the monks worked late. And the dark outlines of thatched farm huts, directly ahead.

Chris pointed toward the monastery. Why weren’t they going there?

Marek made a pillow with his hands: Everybody sleeping.

Chris shrugged: So?

Marek pantomimed waking up, startled, alarmed. He seemed to mean that they would cause a commotion if they went in in the middle of the night.

Chris shrugged: So?

Marek wagged a finger: Not a good idea. He mouthed, In the morning.

Chris sighed.

Marek went past the farm huts, until he came to a burned-out farmhouse  –  four walls, and the black remains of timbers that had supported a thatched roof. He led them inside, through an open door that had a red streak across it. Kate could barely see it in the darkness.

Inside the hut was tall grass, and some pieces of broken crockery. Marek began rummaging through the grass, until he came up with two clay pots with cracked rims. They looked like chamber pots to Kate. Marek set them out carefully on one burned windowsill. She whispered, "Where do we sleep?"

Marek pointed to the ground.

"Why can’t we go into the monastery?" she whispered, gesturing to the open sky above them. The night was cold. She was hungry. She wanted the comfort of an enclosed space.

"Not safe," Marek whispered. "We sleep here."

He lay on the ground and closed his eyes.

"Why isn’t it safe?" she said.

"Because somebody has an earpiece. And they know where we’re going."

Chris said, "I wanted to talk to you about – "

"Not now," Marek said without opening his eyes. "Go to sleep."

Kate lay down, and Chris lay beside her. She pushed her back against his. It was just for warmth. It was so damn cold.

In the distance, she heard the rumble of thunder.

Sometime after midnight it began to rain. She felt the heavy drops on her cheeks, and she got to her feet just as the downpour started. She looked around and saw a small wooden lean-to, partially burned but still standing. She crawled under it, sitting upright, again huddling together with Chris, who had joined her. Marek came over, lay down nearby, and immediately went back to sleep. She saw raindrops spatter his cheeks, but he was snoring.

26:12:01

Half a dozen hot-air balloons were rising above the mesas in the morning sun. It was now almost eleven o’clock. One of the balloons had a zigzag pattern, which reminded Stern of a Navajo sandpainting.

"I’m sorry," Gordon was saying. "But the answer is no. You can’t go back in the prototype, David. It’s just too dangerous."

"Why? I thought this was all so safe. Safer than a car. What’s dangerous?"

"I told you we don’t have transcription errors  –  the errors that occur during rebuilding," Gordon said. "But that’s not precisely accurate."

"Ah."

"Ordinarily, it’s true that we can’t find any evidence of errors. But they probably occur during every trip. They’re just too minor to detect. But like radiation exposure, transcription errors are cumulative. You can’t see them after one trip, but after ten or twenty trips, the signs start to be visible. Maybe you have a small seam like a scar in your skin. A small streak in your cornea. Or maybe you begin to have noticeable symptoms, like diabetes, or circulatory problems. Once that happens, you can’t go anymore. Because you can’t afford to have the problems get worse. That means you’ve reached your trip limit."

"And that’s happened?"

"Yes. To some lab animals. And to several people. The pioneers  –  the ones who used this prototype machine."

Stern hesitated. "Where are those people now?"

"Most of them are still here. Still working for us. But they don’t travel anymore. They can’t."

"Okay," Stern said, "but I’m only talking about one trip."

"And we haven’t used or calibrated this machine for a long time," Gordon said. "It may be okay, and it may not be. Look: suppose I let you go back, and after you arrive in 1357, you discover you have errors so serious, you don’t dare return. Because you couldn’t risk more accumulation."

"You’re saying I’d have to stay back there."

"Yes."

Stern said, "Has that ever happened to anybody?"

Gordon paused. "Possibly."

"You mean there’s somebody back there now?"

"Possibly," Gordon said. "We’re not sure."

"But this is very important to know," Stern said, suddenly excited. "You’re telling me there might be somebody already back there who could help them."

"I don’t know," Gordon said, "if this particular person would help."

"But shouldn’t we tell them? Advise them?"

"There’s no way to make contact with them."

"Actually," Stern said, "I think there is."

16:12:23

Shivering and cold, Chris awoke before dawn. The sky was pale gray, the ground covered by thin mist. He was sitting under the lean-to, his knees pulled up to his chin, his back against the wall. Kate sat beside him, still asleep. He shifted his body to look out, and winced with sudden pain. All his muscles were cramped and sore  –  his arms, his legs, his chest, everywhere. His neck hurt when he turned his head.