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Adult: If a tree falls in the forest with no one around to hear it, does it make a sound?

A modern child: It depends. Let me check if any of the local cams had sonic or vibrational pickups.

Cute. But in fact, most places on Earth still aren’t covered by any close-in cams at all! It’s a lot easier to disappear in the countryside, beyond any sign of habitation.

Unfortunately, that’s where Maharal spent his last hours, and possibly days.

I started with police images of the crash site, offering stu

The desert, I thought, glumly. Why did it have to be the damn desert?

Overhead, spa

The road made a sharp turn just before reaching this lonely site. Skid marks intersected the maimed guardrail … as if the driver had realized his peril suddenly, though too late. This, combined with results from Maharal’s autopsy, convinced authorities that he must have simply dozed off at the wheel.

The tragedy never would have happened if he used the car’s auto-navigation system. Why would someone drive at night, in an unlit desert, with all safety features cut out?

Well, I answered my own question, robot-piloting leaves a trace. You don’t use autonav when you’re worried about being followed. Maharal’s gray ditto had admitted that the good doctor spent his last days oscillating in and out of paranoia. This supported the story.

Reversing the flow of time, I watched emergency vehicles converge backward and then disperse again, one by one, till just a solitary camview was available … a speckly image from the first sheriff’s cruiser to arrive on the scene. When I tried ratcheting still earlier, the fatal patch of desert not only went dark, it vanished from memory, like a blind spot you couldn’t even look at. It appeared only on maps. An abstraction. For all anyone knew for sure, it did not even exist during the time in question.

Farm country would’ve been better. Agriculturalists use a lot of cameras to monitor crops. Anything irregular, like a stranger, might show up. But the hectare in question featured just a simple EPA toxicity detector, vigilant against illegal dumping. The nearest real lens was more than five klicks away — a habitat sca

Still, I didn’t give up. There are ten thousand commercial and private spy-sats orbiting this planet, and even more robot aircraft cruising the high stratosphere, serving as phone relays and newscams. One of them might have been focused on this obscure place when the accident happened, recording a handy image of Maharal’s headlights, swerving and then spi

I checked … and there was no such luck. All the high-resolution lenses were busy elsewhere that night, zooming onto busier sites. Tech-pundits keep promising we’ll have WorldOmniscient viewing in a few years, with close-ups of the whole Earth available to everyone, all the time. But right now, that’s just sci-fi stuff.

My best bet was to try a little trick of my own, using the coarse data from a micro-climate orbiter. Not a true camera, the weathersat is assigned to track wind gusts across the southwest, using Doppler radar.

Traffic stirs the air, especially in open countryside. Long ago I figured out that you can trace the passage of a single vehicle, if conditions are right. And if you’re lucky.

Using special processing software, I massaged the weathersat’s recorded scan of the area near the viaduct, moments before the crash. Looking for very small patterns, I prodded and palped the Doppler elements till they were grainy, fluctuating at the edge of chaos.

At first, it looked like nothing more than a storm of multicolored noise. Then I began picking out patterns.

There!





It looked like a trail of mini-cyclones, spi

This might work, I thought, so long as Maharal didn’t pass any other traffic … and assuming the air stayed quiet all that lonely night.

Almost any outside disturbance could erase the wraithlike spoor.

Comparing distance and time scales, I could tell one thing about Maharal’s condition that night as he sped toward his tryst with death — the Universal Kilns scientist sure must have had a bee up his shorts! He topped over a hundred and twenty klicks along most of that curvy road. The guy was just asking for trouble.

Could someone have been following him? Chasing? The trail of cyclonic disturbance was too ragged and smeared to tell if it was made by one vehicle or two.

I asked Nell to keep following the faint pattern as far back in time as she could.

“Acknowledged,” my house computer answered, almost sounding human. “If you aren’t too busy, there are some other matters that have come up while you were immersed in work. Your colleague Malachai Montmorillin called several more times. I put him off, per your instructions.”

I felt a little guilty. Poor Pal. “I’ll make it up to him tonight. Orders stand.”

“Very well. I have also received a pneumatic shipment from Universal Kilns. Five new ditto blanks.”

“Put them away. And please stop bothering me with trivia.”

Nell went silent. I could see on one monitor that she was concentrating on following Maharal’s desert track. So I turned away to check on the cyber-avatar that I had unleashed in the city cam-web.

The results looked gratifying!

Purchased images and camera-posse reports were pouring in, providing a picture of where Yosil Maharal had spent much of the last few months, at least when he was in town. I skim-sampled the resulting movie at high speed, tailing the late researcher as he moved from one eyeview to the next … shopping in a fashionable arcade, for instance, or visiting his hygienist for a routine oral-symbiont upgrade. The mesh of spottings still amounted to only a couple of hours a day, on average. But after all, Maharal spent most of his time working in the lab at Universal Kilns, or at home.

Except for those mysterious trips to the countryside, that is. It was essential to forge a link between his city trail and those cryptic sojourns out of town.

Still, I felt content with progress so far. If the city mesh kept filling in at this rate, I should have something worthwhile to report to Ritu.

A sharp twinge brought my hand to my right temple. One byproduct of all this work was a growing headache. Real neurons can only take so much holovideo input. Anyway, it was time I got up to relieve my bladder.

Stopping at the chemsynth unit on my way back, I ordered a tension potion — something to ease the knot in my neck, but without any thought-dulling endorphins. I took the frothy concoction back to the study … only to find someone in my place! Somebody built like me, but with longer fingers and a disdainful expression that I seldom wear. At least I hope I don’t.