Rigg immediately assumed that the shouting was so that the other soldiers on the boat would get the message; to Rigg, Citizen did not look genuinely angry at Shouter. The sincere glance of rage was directed at Rigg.

When the general was gone and he was alone with Shouter, it took a great deal of effort for Rigg to keep himself from laughing. Good old Loaf had not only gotten himself and Umbo off the boat, he had tossed the watchdog into the water as well. And General Citizen, whatever his real purpose might be, was not happy.

CHAPTER 11

Backward

This time it took eleven days for the computers to come up with their answer.

“Converting the energy requirement into mass,” said the expendable, “all the computers agree that without violating previously observed laws of physics, the most likely cost of returning from the fold to our previous position in spacetime, but with the direction reversed, would be about nineteen times the mass of this ship and everything on it.”

“Nineteen computers,” said Ram, “and nineteen times the mass.”

“Do you find this coincidence significant?” asked the expendable.

“Each computer was an observer and a meddler in spacetime at the time the fold was created,” said Ram. “You and I weren’t observers, because we could not sense or even understand the convolutions of the fields being generated. So for each observer, there had to be a distinct jump. And for each jump, there had to be an expenditure of mass equal to the total mass of the ship and its contents.”

“So if there had been only nine or ten computers,” said the expendable, “we would have come only halfway back to the present?”

“No,” said Ram. “I think if there had been only one computer, we would have crossed the fold only one-nineteenth as far into the past of the target star system before being shoved back, in reverse.”

“You seem to be very happy about this hypothesis,” said the expendable, “but I don’t see why. It still explains nothing.”

“Don’t you see?” said Ram. “Crossing the fold pushed us into the past a certain amount, based on the mass of the ship and its velocity or whatever. But the only way to pay for that passage across the fold was to send an equal mass backward. And because there were nineteen observers creating the fields that created the fold, it happened nineteen times.”

“But it happened only once,” said the expendable.

“No,” said Ram. “It happened nineteen times. For each jump, a copy of the ship was thrust backward in time. Eighteen other versions of ourselves occupy the identical space as the original ship, only moving the opposite direction through time as we journey toward Earth, all of us invisible to each other.”

“So our reliance on the computers caused the failure of the mission?” asked the expendable.

“The mission didn’t fail,” said Ram. “It succeeded nineteen times. We’re just the exhaust trail.”

•  •  •

Loaf was full of plans to sneak back into O and live there in hiding long enough for Umbo to deliver his messages. Only when Umbo finally convinced him that he had no idea how to do it did Loaf finally realize that learning how to go back in time might better be done somewhere else.

“I might not learn how to go back in time for weeks,” said Umbo as they walked through the woods, back toward O. “Or months.” If I ever do. “It was only Rigg who could go back in time. I helped, by slowing him down. Or speeding him up.”

“Which?”

“I always thought I was slowing other people down, but Rigg said I was really speeding them up so that everything around them seemed slower.”

Loaf grunted at that and moved a branch out of the way, holding it so it didn’t swing back and hit Umbo in the face.

“Thanks,” said Umbo. “You see, Rigg could always see the paths of people moving around in the past. Long before I ever helped him. He knew what he was looking for. I don’t.”

Another grunt.

“We need a safe place to go where I can practice trying to do to myself whatever it is I do to other people. And even then, who knows whether I’ll be able to see anything?”

“Look,” said Loaf, “we know you did it. We know it happens. We just have to be patient. And you have to work hard at it so we don’t waste too much time.”

“It’s not a waste of time,” said Umbo. “It’s however long the job takes.”

“Here’s how I see things,” said Loaf. “We must have gone through all this before, only the first time, Rigg got arrested without your moving the knife and without my hiding the jewels and money. Then you learned how to go back in time, came back to O, delivered the warnings, and now everything is happening differently. So why do you need to deliver the messages this time at all?”

“Because none of that has happened yet, so now it won’t,” said Umbo. “I have to learn how to travel in time so I can go back this time and deliver the same message again.”

“But you didn’t get the message twice, did you? So why deliver it twice?”

“I don’t know,” said Umbo. “I don’t think it is twice. I think there’s only one message, and I still have to deliver it.”

“But you only know you have to deliver it because you already did. And that’s the point. You already did. But I’m not going to argue with you. Even if you don’t have to deliver the same message again, it’ll be useful for you to learn how to do it. And then if it makes you feel better, go ahead and deliver the messages—if you remember what you actually said.”

“I have to do it because I know I already did, only when I did it, it was the future, so I have to get to the future in order to come back and do what I already did . . . This is so crazy that it has to be impossible.”

“Except it happened, so it is possible. We won’t do your figuring-it-out time in O, because we might get caught. But I’m still going back to get the jewels and the money. The coins will be convenient for us, right now—we can buy passage upriver to Leaky’s Landing and stay there in safety for a while. But the jewels and the knife—it’s not like we can cash those in. I think you came back to warn Rigg and yourself because first time we went through this experience, those items got taken by the soldiers, and that made everything worse for Rigg. That first stone—did it just happen to be the only one that was legendary and fabulously valuable? Or are there others that would make things even worse if Rigg was caught with them? And that knife—who knows what that would cause. It’s very old, but it looks very new, right? And Rigg never did know anything about the man he lifted it from.”

“So we should take the money and bury the knife and the jewels somewhere nobody can ever find them,” said Umbo.

“No,” said Loaf. “Because we don’t know but what we’ll need them later to buy Rigg’s freedom. Or some other thing. They’re Rigg’s inheritance from his father, so what we have to do is keep them out of the hands of the Revolutionary Council or anybody else who means us ill. But we still need to get it all to Aressa Sessamo so Rigg will have the use of them if he ever needs them.”

“Because having them has worked out so splendidly up to now,” said Umbo.

Loaf gave him a little shove. “Look what you’re wearing. Look what we’ve experienced, the people we’ve talked to, the things we’ve learned. A few weeks of being rich has taught me a lot.”

“Like what? That it gets you arrested?”

“It was Rigg’s name that got him arrested, not his money.”

“So what has being rich—or hanging around with a rich kid—taught you?”

Loaf grinned. “That I like it a lot better than being poor.”