But if there were no New Law robots, there would be no New Law robot problem. Toward that end, Gildern and his people had been searching for Valhalla, the New Law robot city, for quite some time, since long before anyone had ever heard of Comet Grieg. Nothing had ever come of the effort.

But now-now things were different. And Beddle was eager to find out precisely how different. “All right,” he said to Gildern. “What have you got for me?”

“More pieces of the puzzle, sir. As you know, a direct search for Valhalla has never been possible. The minute anyone tried a search, the New Law robots would simply shut everything down. Besides which, the New Law robots encrypt their long-range hyperwave traffic, and we have not had much luck in reading it. Hyperwave signals are also difficult to track with any precision. But with enough signals, it is possible to do statistical analysis. And there has been enough traffic in recent days to let us do some pretty fair work. And more physical traffic as well. The New Law robots are working as hard and as fast as anyone to evacuate in time. That means more signal traffic, more aircars and land cars and transports and so forth. And they are being less careful. There is less point in concealing a hidden city that is about to be destroyed.

“The long and the short of it is that we have had a lot more data to work with, and we have been able to work from a lot closer in than we were in times past. We can get equipment and robots in here, right on top of things.”

“With what result?” Beddle asked.

“The best possible result,” Gildern replied. “Absolute confirmation that Valhalla is somewhere inside the primary impact site for the first and largest of the comet fragments. It will be utterly destroyed.”

“But we were virtually certain of that before. And as the New Laws are clearly preparing to evacuate, what good will it do for the comet to destroy them after they have all gone?”

“None whatsoever. But look around yourself. Look at Depot.”

“What about it?”

“Depot is being evacuated as well-and there have never been so many people here. The people here all know this place is going to be wiped out, but there is no danger in being here now. However, in the meantime, there is a great deal of work to be done, so they have pulled in all sorts of people to do it”‘

“What are you saying?”

“I’m saying that our sources confirm that New Law robots are vanishing from all the places they usually are. They are buying out their labor contracts, closing up the shops they run in the smaller settlements. We’ve seen a large number of them pass through Depot and estimate that ninety percent of the existing New Law robots are in the vicinity.”

“And so you think they are rushing home to Valhalla to help and salvage what they can. What of it? They will be gone before the comet hits.”

“Quite true. But all we need to do is locate Valhalla before the comet strikes, and destroy it while they are still there. And I believe both goals are more achievable than you would think. I also believe it is highly likely that you can accomplish them both, yourself, personally.”

“How?” Beddle demanded, a world of eagerness and ambition bound up in that one little word.

“As for the first part, the question of locating Valhalla, we are able to track a great deal of the increased air, ground, and hyperwave traffic from here, but our ability to triangulate and backtrack is highly limited. If we had a mobile tracking station, equipped with the proper detection equipment, we would soon be able to sort through all the deliberate false trails and extraneous signals.”

“What do I have to do with a mobile tracking station?”

Gildern leaned forward eagerly. “It’s quite simple. We have installed the proper tracking gear on my long-range aircar. I can provide you with robots trained to operate the system, who know how to coordinate the work with the base station here. In short, we would tell your aircar where to go, your aircar would obtain readings from that position, and then move on to the next location. You are planning to visit several of the small outlying settlements on this trip. That would suit us perfectly. Land one place and give a speech while your robots do a detection sweep, then fly on to the next spot, and the next, and the next. We’d rapidly accumulate enough data to establish a very good fix on Valhalla. With enough data, I expect we ought to be able to get within an error radius of only five or eight kilometers. And that should be quite good enough.”

“Good enough for what?” Beddle asked.

Gildern was about to reply when the ground suddenly gave a strange, sharp little shudder and the building rattled and shook hard enough that it seemed close to folding itself back up. The air was suddenly full of dust, seemingly thrown up from out of nowhere. There was a distant rumbling and a muted boom! that seemed to come from somewhere far off.

Gildern gestured reassuringly. “There’s no danger,” he said. “Notice that none of our robots even bothered to rush in to our rescue. But to answer your question-good enough for one of those. For a burrow bomb-a seismic sounder.”

“A burrow bomb?”

“They’ve set off any number of them around here. The scientists want to understand the underlying geology of this area as thoroughly as possible before the impact, so they can better interpret the results of the impact. The explosions cause seismic shock. The bombs themselves are carefully calibrated. They can burrow themselves deep into the earth and set themselves off at a predetermined time and depth. By measuring the vibrations produced by the explosions from various receiving stations, and seeing how they have been changed, the scientists can determine what sort of strata the vibrations have gone through. It’s an unusually destructive way of doing geology, but it gets the job done fast-and what difference does it make when the comet is going to destroy everything anyway? We are virtually certain that Valhalla is underground. If we set off a burrow bomb close enough to Valhalla, the shock waves should collapse the entire city, killing or trapping everyone inside.

“There are four or five researcher agencies setting off these devices. I have taken steps to establish a real seeming, research group myself. Everything is being done in such a frantic hurry, with the comet bearing down, that it was easy to get all the various approvals. Our little operation has already set off three sounders, all duly reported ahead of time and properly recorded and so on. In order to stay legal, there need only be an hour or two’s notice of your explosion. You will not be violating any law at all.”

“How could that be?”

“The New Law robots have no legal standing. Technically, they are abandoned property themselves, and they certainly can’t own property. They have never registered any title to Valhalla-how could they, when no one knows where it is?”

Beddle nodded impatiently. The arguments were all familiar to him. “Yes, yes, you don’t have to convince me of anything. But don’t be naive. Those legal arguments have never been settled. Some lower courts have ruled that they can own land. Even if the laws had been settled, and in our favor, a thing does not have to be illegal before it causes us trouble.” Beddle paused for a moment, and then smiled. “However, if it means the destruction of nearly all the New Law robots, I am willing to contend with a whole world of trouble. The price might be high, but, even so, it would be a bargain. “ Beddle leaned back in his chair and thought for a moment. “And you believe all this is feasible? That it has a reasonable chance of success?”

“Yes, sir. I won’t insult your intelligence by pretending it’s a sure thing. But I think it can be done.”

Simcor Beddle looked at his second-in-command thoughtfully. It was a risky scheme. There was no doubt about that. It was all but a certainty that they would be found out.