Timeline. Part 15

The easiest way to find it now would be to locate where it ended inside the castle and to follow it back. But to find that opening, she would need technical help. Probably the best thing would be ground radar. But to do that, she'd need the castle empty. It was closed on Mondays; they might do it next Monday, if- Her radio crackled. "Kate?"

It was Marek.

She held the radio to her face, pressed the b.u.t.ton. "Yes, this is Kate."

"Come back to the farmhouse now. It's an emergency."

And he clicked off.

Nine feet underwater, Chris Hughes heard the gurgling hiss of his regulator as he adjusted the tether that held him in place against the current of the Dordogne. The water clarity was not bad today, about twelve feet, and he was able to see the entire large pylon of the fortified mill bridge, at the water's edge. The pylon ended in a jumble of large cut rocks that ran in a straight line across the river. These rocks were the remains of the former bridge span.

Chris moved along this line, examining the rocks slowly. He was looking for grooves or notches that would help him determine where timbers had been used. From time to time, he tried to turn one rock over, but it was very difficult underwater because he could get no leverage.

On the surface above, he had a plastic float with a red-striped diver's flag. It was there to protect him from the vacationing kayakers. At least, that was the idea.

He felt a sudden jerk, yanking him away from the bottom. He broke surface and b.u.mped his head against the yellow hull of a kayak. The rider was holding the plastic float, shouting at him in what sounded like German.

Chris pulled his mouthpiece out and said, "Just leave that alone, will you?"

He was answered in rapid German. The kayaker was pointing irritably toward the sh.o.r.e.

"Listen, pal, I don't know what you're-"

The man kept shouting and pointing toward the sh.o.r.e, his finger stabbing the air.

Chris looked back.

One of the students was standing on the sh.o.r.e, holding a radio in his hand. He was shouting. It took Chris a moment to understand. "Marek wants you back to the farmhouse. Now."

"Jesus, how about in half an hour, when I finish-"

"He says now now."

Dark clouds hung over the distant mesas, and it looked like there would be rain. In his office, Doniger hung up the phone and said, "They've agreed to come."

"Good," Diane Kramer said. She was standing facing him, her back to the mountains. "We need their help."

"Unfortunately," Doniger said, "we do." He got up from his desk and began to pace. He was always restless when he was thinking hard.

"I just don't understand how we lost the Professor in the first place," Kramer said. "He must have stepped into the world. You told him not to do it. You told him not to go in the first place. And he must have stepped into the world."

"We don't know what happened," Doniger said. "We have no d.a.m.n idea."

"Except that he wrote a message," Kramer said.

"Yes. According to Kastner. When did you talk to her?"

"Late yesterday," Kramer said. "She called me as soon as she knew. She's been a very reliable connection for us, and she-"

"Never mind," Doniger said, waving his hand irritably. "It's not core."

That was the expression he always used when he thought something was irrelevant. Kramer said, "What's core?"

"Getting him back," Doniger said. "It is essential that we get that man back. That is core."

"No question," Kramer said. "Essential."

"Personally, I thought the old fart was an a.s.shole," Doniger said. "But if we don't get him back, it's a publicity nightmare."

"Yes. A nightmare."

"But I can deal with it," Doniger said.

"You can deal with it, I'm sure."

Over the years, Kramer had fallen into the habit of repeating whatever Doniger said when he was in one of his "pacing moods." To an outsider, it looked like sycophancy, but Doniger found it useful. Frequently, when Doniger heard her say it back, he would disagree. Kramer understood that in this process, she was just a bystander. It might look like a conversation between two people, but it wasn't. Doniger was talking only to himself.

"The problem," Doniger said, "is that we're increasing the number of outsiders who know about the technology, but we're not getting a commensurate return. For all we know, those students won't be able to get him back, either."

"Their chances are better."

"That's a presumption." He paced. "It's weak."

"I agree, Bob. Weak."

"And the search team you sent back? Who did you send?"

"Gomez and Baretto. They didn't see the Professor anywhere."

"How long were they there?"

"I believe about an hour."

"They didn't step into the world?"

Kramer shook her head. "Why take the risk? There's no point. They're a couple of ex-marines, Bob. They wouldn't know where to look even if they did step in. They wouldn't even know what to be afraid of. It's completely different back there."

"But these graduate students may know where to look."

"That's the idea," Kramer said.

Distant thunder rumbled. The first fat drops of rain streaked the office windows. Doniger stared at the rain. "What if we lose the graduate students, too?"

"A publicity nightmare."

"Maybe," Doniger said. "But we have to prepare for the possibility."

The jet engines whined as the Gulfstream V rolled toward them, "ITC" in big silver letters on the tail. The stairs lowered, and a uniformed flight attendant rolled out a strip of red carpet at the bottom of the stairs.

The graduate students stared.

"No kidding," Chris Hughes said. "There really is is a red carpet." a red carpet."

"Let's go," Marek said. He threw his backpack over his shoulder and led them aboard.

Marek had refused to answer their questions, pleading ignorance. He told them the results of the carbon dating. He told them he couldn't explain it. He told them that ITC wanted them to come to help the Professor, and that it was urgent. He didn't say any more. And he noticed that Stern, too, was keeping silent.

Inside, the plane was all gray and silver. The flight attendant asked them what they wanted to drink. All this luxury contrasted with the tough-looking man with cropped gray hair who came forward to greet them. Although the man wore a business suit, Marek detected a military manner as he shook hands with each of them.

"My name's Gordon," he said. "Vice president at ITC. Welcome aboard. Flying time to New Mexico is nine hours, forty minutes. Better fasten your seat belts."

They dropped into seats, already feeling the aircraft begin to move on the runway. Moments later, the engines roared, and Marek looked out the window to see the French countryside fall away beneath them.

It could be worse, Gordon thought, sitting at the back of the plane and looking at the group. True, they were academics. They were a little befuddled. And there was no coordination, no team feeling among them.

But on the other hand, they all seemed to be in decent physical condition, particularly the foreign guy, Marek. He looked strong. And the woman wasn't bad, either. Good muscle tone in the arms, calluses on her hands. Competent manner. So she might hold up under pressure, he thought.

But the good-looking kid would be useless. Gordon sighed as Chris Hughes looked out the window, caught his own reflection in the gla.s.s, and brushed back his hair with his hand.

And Gordon couldn't decide about the fourth kid, the nerdy one. He'd obviously spent time outdoors; his clothes were faded and his gla.s.ses scratched. But Gordon recognized him as a tech guy. Knew everything about equipment and circuits, nothing about the world. It was hard to say how he'd react if things got tough.

The big man, Marek, said, "Are you going to tell us what's going on?"

"I think you already know, Mr. Marek," Gordon said. "Don't you?"

"I have a piece of six-hundred-year-old parchment with the Professor's writing on it. In six-hundred-year-old ink."

"Yes. You do."

Marek shook his head. "But I have trouble believing it."

"At this point," Gordon said, "it's simply a technological reality. It's real. It can be done." He got out of his seat and moved to sit with the group.

"You mean time travel," Marek said.

"No," Gordon said. "I don't mean time travel at all. Time travel is impossible. Everyone knows that."

"The very concept of time travel makes no sense, since time doesn't flow. The fact that we think time pa.s.ses is just an accident of our nervous systems-of the way things look to us. In reality, time doesn't pa.s.s; we pa.s.s. Time itself is invariant. It just is is. Therefore, past and future aren't separate locations, the way New York and Paris are separate locations. And since the past isn't a location, you can't travel to it."

They were silent. They just stared at him.

"It is important to be clear about this," Gordon said. "The ITC technology has nothing to do with time travel, at least not directly. What we have developed is a form of s.p.a.ce travel. To be precise, we use quantum technology to manipulate an orthogonal multiverse coordinate change."

They looked at him blankly.

"It means," Gordon said, "that we travel to another place in the multiverse."

"And what's the multiverse?" Kate said.

"The multiverse is the world defined by quantum mechanics. It means that-"

"Quantum mechanics?" Chris said. "What's quantum mechanics?"

Gordon paused. "That's fairly difficult. But since you're historians," he said, "let me try to explain it historically."

"A hundred years ago," Gordon said, "physicists understood that energy-like light or magnetism or electricity-took the form of continuously flowing waves. We still refer to 'radio waves' and 'light waves.' In fact, the recognition that all forms of energy shared this wavelike nature was one of the great achievements of nineteenth-century physics.

"But there was a small problem," he said. It turned out that if you s.h.i.+ned light on a metal plate, you got an electric current. The physicist Max Planck studied the relations.h.i.+p between the amount of light s.h.i.+ning on the plate and the amount of electricity produced, and he concluded that energy wasn't a continuous wave. Instead, energy seemed to be composed of individual units, which he called quanta. "The discovery that energy came in quanta was the start of quantum physics," Gordon said.

"A few years later, Einstein showed that you could explain the photoelectric effect by a.s.suming that light was composed of particles, which he called photons. These photons of light struck the metal plate and knocked off electrons, producing electricity. Mathematically, the equations worked. They fit the view that light consisted of particles. Okay so far?"

"Yes...."

"And pretty soon, physicists began to realize that not only light, but all energy was composed of particles. In fact, all matter in the universe took the form of particles. Atoms were composed of heavy particles in the nucleus, light electrons buzzing around on the outside. So, according to the new thinking, everything is particles. Okay?"

"Okay...."

"The particles are discrete units, or quanta. And the theory that describes how these particles behave is quantum theory. A major discovery of twentieth-century physics."

They were all nodding.

"Physicists continue to study these particles, and begin to realize they're very strange ent.i.ties. You can't be sure where they are, you can't measure them exactly, and you can't predict what they will do. Sometimes they behave like particles, sometimes like waves. Sometimes two particles will interact with each other even though they're a million miles apart, with no connection between them. And so on. The theory is starting to seem extremely weird.

"Now, two things happen to quantum theory. The first is that it gets confirmed, over and over. It's the most proven theory in the history of science. Supermarket scanners, lasers and computer chips all rely on quantum mechanics. So there is absolutely no doubt that quantum theory is the correct mathematical description of the universe.

"But the problem is, it's only only a mathematical description. It's just a set of equations. And physicists couldn't visualize the world that was implied by those equations-it was too weird, too contradictory. Einstein, for one, didn't like that. He felt it meant the theory was flawed. But the theory kept getting confirmed, and the situation got worse and worse. Eventually, even scientists who won the n.o.bel Prize for contributions to quantum theory had to admit they didn't understand it. a mathematical description. It's just a set of equations. And physicists couldn't visualize the world that was implied by those equations-it was too weird, too contradictory. Einstein, for one, didn't like that. He felt it meant the theory was flawed. But the theory kept getting confirmed, and the situation got worse and worse. Eventually, even scientists who won the n.o.bel Prize for contributions to quantum theory had to admit they didn't understand it.

"So, this made a very odd situation. For most of the twentieth century, there's a theory of the universe that everyone uses, and everyone agrees is correct-but n.o.body can tell you what it is saying about the world."

"What does all this have to do with multiple universes?" Marek said.

"I'm getting there," Gordon said.