the invisible brawl that was going on. Now and again the image of him broke up a bit, with the intervening sequences linked by animation. The effect was much more startling in close-up, as the crude overenlarged images suddenly shifted into the oversimplified images of a generic man and then back again. Every time it happened, Fredda’s stomach tightened a bit, fearful that they had come to the last real video image of him, and they were about to lose him altogether.
The image of the man went down a side passage, walking purposefully, a man who knew exactly where he was going and why. No pausing at intersections or hesitating over which turning to take. Either he had been in the building at some point in the past, or he had been briefed in detail.
“Still not sure he makes sense as our man?” Fredda asked Donald.
“His actions are remarkably purposeful for a casual visitor,” Donald conceded. “He appears to be making for the service areas at the rear of the building.”
The pale man came to an unmarked door, glanced behind himself, opened it, stepped through, and closed it behind him. Fredda found herself staring at a blank door that had been closed in her face.
“Damn it, Donald, follow him,” Fredda demanded. She was so caught up in the chase that it was a real effort of will to remember that her quarry was long gone, that she was tracking nothing more than an integrator image.
“One moment, ma’am.” Donald worked the control panel, and then looked back up at Fredda. “I’m sorry, ma’am. That is the last of the data recorded from that location, and there were no video sources on the other side of the door. I can show you what is on the other side of the door, but there is no point in placing the man’s simulacrum there. There is no information at all about any other activity in that sector until the activation of the security robots. Once they were activated and deployed, they recorded that vicinity in great detail, but those records were of course destroyed with the robots. There is no further sign of the man we have been tracking in the extant records.”
“Why should that one spot get detailed recording from the security robots?”
Donald ran the integrator image forward straight through the door, revealing a downward ramp beyond it. He ran the video image down the ramp and turned the corner at the bottom.
And there were the SPRs, the Sapper security robots, turned off, inert, lined up neatly.
“Burning stars,” Fredda said. “Our pale-faced friend came here. Hid out in the same room as the security robots.”
“So it would appear,” Donald said. “Note the line of storage closets along the rear wall. I would expect that he secreted himself in one of them.”
“Probably,” Fredda said. She stared at the image, determined to think it all through. If Pale-man had come down here, then he clearly knew that the security robots were to be turned off. The image before her showed the integrator’s best information as to the state of the robots as of that moment. Upstairs, at the same time, Sheriff Kresh was still sorting through the chaos after the staged attack. When Pale-man came down here he would have to know that the security robots would be deployed soon afterwards.
But he would also know that the robots had been tampered with. That they would suddenly stop working, and that the building would be wide open to him. If Pale-man kept his cool, there was nothing at all to fear from being down here. All he had to do was hide, wait until the Sappers were deactivated, then come out with his blaster and—
Hold it. His blaster. There were weapon-sniffers on all the entrances to the Residence, and around the perimeter of the property. Fredda had no trouble believing that the security net could have missed an intruder slipping into the place. That sort of mistake would be easy to make. But how could the system have missed a blaster corning in? She checked the images of Pale-man. No baggy clothes or carry bag that might conceal a gun. Besides, the weapons detectors would have picked up a gun. Nothing as small as any weapon he could have been carrying would be big enough to be shielded. No. Pale-man could not possibly have been wearing one on his way in.
And therefore—therefore his blaster had been planted for him before he got in the house. And all of a sudden Fredda had a pretty damned good idea where and how.
The underground storage room that had held the SPRs looked strangely different, strangely the same, in real life. The integrator had shown an idealized version of it, pulled up from the computerized architectural plans and a few still photos, but that was only part of the strangeness. Somehow, the room looked much smaller, rather than larger, than it had through the integrator. The real-life lights were a little dimmer, and the real walls were scuffed and marked here and there in ways the sim’s walls were not. The air was cool and a bit dank. Amazing the way reality could show up all the flaws of a simulation, flaws you had not even noticed in the sim.
But the key difference, of course, was that there were no neat rows of robots down here anymore. There was only one, a blown-out wreck, much more shot to hell than any of the SPRs on the upper floors had been. There was more to it than the damage being more severe. The blast holes looked different as well. But why? Why blast this one all to hell, differently and more violently than any of the others?
Fredda thought she knew the answer, the answers to those puzzles. But she could not be sure. Not yet. Not until she got a look at the fiftieth SPR. The fiftieth.
What bothered Fredda was the fact that she had not even noticed that an SPR was missing. There had been fifty SPRs to start with, but she had not even thought to do a count on them, until now. Now she knew there had been twenty-two SPRs on the upper level, and twenty-seven on the ground floor.
If that information had been in her head earlier, she would have turned the place upside-down to find that missing fiftieth robot. She would have found this one, the crucial one, much sooner.
Not that this one had been overlooked by anyone except Fredda. Gallingly enough, search teams had even logged in the location of this one two hours ago, but they had not examined it closely. What was one more shot-up robot in a building that was full of them?
She wanted to dive right in, to take this robot apart and find the clues, the proofs, she knew were inside it. But she resisted. Suppose she set to work now and smudged a fingerprint or something? No, thank you. There was no point in making any more mistakes.
It had been frustrating enough to have that imaginary door in the integrator simulation close on her face. To track the suspect this far and then come up with nothing—that would be slamming into a wall. It was starting to dawn on her just how much patience police work involved.
So, do it right, do it carefully. The clues in this room might be the core of the case. Don’t ruin them. Let the robots do their job first. Then she could do hers.
“Donald,” Fredda said. “I want you to call in a full team of Crime Scene robots. I want this robot and this entire room—and all the storage closets—scanned down to the maximum resolution. Our friend Mr. Pale-man was hiding in here, and he must have left some traces.”
“That is by no means certain,” Donald said. “It would be most useful, but we cannot count on it.”
“But he must have left something behind,” Fredda protested. “A bit of hair, a fingerprint, something.” Or was it possible that he could have left no trace at all behind? Fredda suddenly realized just how little she knew about the sort of clues she was counting on the robots to find.
“It is possible the Crime Scene team will find something,” Donald said, “but bear in mind that if our suspect took a few simple precautions there would be nothing for us to find.”
Precautions? Fredda was suddenly confident of her ground. Forensics and clues she did not know about, but people she understood. She already had a pretty solid feel for Pale-man. Just watching him on the integrator had told her a lot. “This is not a man who takes all the simple precautions,” she said. “This is a man who makes mistakes. If he hadn’t acted so nervous when we first spotted him, if he hadn’t made the slip of looking at his watch, we might have lost him in the shuffle. Instead he brought attention to himself. If he had at least pretended to be interested in the fight, we might have erased him from the image trail along with everyone else who came to watch it.”
“And from those points you make the assumption that he would leave traces for us to find here?” Donald said.
“Oh, it’s no assumption,” Fredda said. “It’s a certainty. He left something behind.” She had no logical reason for believing that, but logic was no more than a tool of reason, and far from the only tool at that. Gut reactions had their place as well.
“Trust me, Donald,” she said again, staring down at the burned-out wreck of the security robot. “This boy left
