“Good luck, Mandelbrot,” said Ariel. “Don’t take too many chances, all right?”

Mandelbrot drove out into the sunlight and turned onto the street. Someone closed the big door behind him. As he drove, he kept watch for Hunters, aware that they would recognize a function truck being driven by a humanoid robot before they would recognize him in particular. He accessed the central computer.

“Transmit a topographical map of this planet with land use identified,” he said.

“WHAT IS YOUR IDENTITY AND YOUR DUTY TASK?” The central computer asked.

He broke the link. The central computer had not always required that information during every communication, but now it was asking him every time. Perhaps it was part of the new security system. He accessed again, just to make sure.

“Give me the location of agricultural developments on this planet,” he said.

“WHAT IS YOUR IDENTITY AND YOUR DUTY TASK?”

He broke contact again. Identifying himself was too risky, and doing so still might not get him the information. He would have to think of something else.

In the meantime, he drove. He kept watch for any break in the grid of city streets and buildings that might indicate a change of land use, but that would only work if Avery was growing food in the open…and doing it nearby. Mandelbrot also turned his attention to smells, in the hope of detecting chemical processing of edible substances.

Far above the planet, a small spacecraft was just entering the atmosphere, still too distant to be visible from the ground. It carried only one passenger.

His name was Jeff Leong, and he had come to repay a debt of gratitude.

Jeff was entering the atmosphere of Robot City in a Hayashi-Smith, which was a small, discontinued model with facilities for ten people. It bore the exotic name of Minneapolis. The ship computer was doing the flying. Jeff had managed to rent it with his father’s credit after persuading him that no one else could be trusted with the task of making this trip.

“Status report,” Jeff said to the computer, watching the screen that showed him white clouds ahead and the glittering pattern far below of urban development.

“EXCELLENT,” said the computer. “SYSTEMS ARE OPERATING EFFICIENTLY AND WEATHER IS OPTIMAL. SELECT LANDING SITE.”

“I don’t know where to land yet,” said Jeff. “I never really knew the geography of this place. Uh, scan for a big pyramid with a flat top, okay? And I mean a. big pyramid.”

“SCANNING. THIS MAY REQUIRE A PROLONGED PERIOD IN VERY LOW ORBIT, DEPENDING ON CLOUD COVER.”

“Whatever it takes.” Jeff leaned back and relaxed.

This was much better than his last arrival on this planet. That had been an emergency crash-landing that had killed everyone else on board. He shook his head to avoid the memories of that frantic descent.

“Computer,” he said aloud. “While you’re scanning, keep watch for humans. I’m looking for a couple of them. And as far as I know, they’re the only humans here.”

“SCANNING MODIFIED.”

The ship computer was not fully positronic, but it was efficient enough to accept Jeff’s orders and translate them into ship controls.

He hoped that finding Derec, Ariel, Mandelbrot, and Wolruf would not take too long. When he had left the planet in the only functioning spacecraft it had-a modified lifepod that supported only one passenger-he had promised to send help back if he could. The craft had taken him to a space lane, and had remained there, sending out a distress signal while keeping him alive.

The ship that had rescued him had been jumping from star to star back to Aurora, and he had yet to reach Nexon, where he hoped to start college. This rescue mission was an important matter of pride to him, since Derec and Ariel and the robot medical team had saved his life. Then Derec and Ariel had sent him away when each of them would have liked to use that ship personally.

He sighed and watched the screen. He expected most of the problem to be in locating them. The Minneapolis was outfitted to take them all back to Aurora together.

“PYRAMID LOCATED,” said the computer. “CLOSE-UP ON SCREEN. PLEASE IDENTIFY.”

On the viewscreen, the Compass Tower shone in the sunlight. The angle was from above, of course, and a little to one side. At this distance, it looked like a flawless model on a design display.

“That’s it,” said Jeff excitedly, sitting forward to look. “Can you land near it somewhere without smashing up anything?”

“SCANNING FOR A LOW-RISK LANDING SITE IN THE AREA,” said the computer. “TO AVOID ALL CHANCE OF DAMAGE TO MANUFACTURED AND CONSTRUCTED PROPERTY, THIS CRAFT REQUIRES MORE LANDING SPACE THAN THE AREA HAS SO FAR OFFERED. “

“Show me the area as you scan it,” said Jeff. “Just try to land as close as you can.”

“DISPLAYING.”

Jeff watched the screen closely as the view pulled back to a greater height and began to move quickly across the landscape. At first he tried to recognize other places, such as a city plaza he remembered and the distinctive bronze dome of the Key Center. He couldn’t find them. Then, as the camera continued to scan, he realized that they were covering a lot of area very quickly.

“Look for an open grassy region,” he said. “It was just outside the city. I’m sure it wasn’t more than a few kilometers from that tower.”

“PERIMETER OF URBAN DEVELOPMENT NOT LOCATED. SCANNING CONTINUES.”

He watched as block after block of city passed beneath them. The robots had continued building, much faster than he had ever imagined. He couldn’t afford to land on the other side of the planet. Derec and Ariel had lived close to the tower.

“Listen,” he said. “Most of this population is robots. If they’re damaged, they can be repaired. Just don’t hit the buildings, ‘cause we won’t survive, either.” He grinned at his own humor.

“CLARIFY.”

“We have to land around here somewhere. Try to avoid the robots, but give us priority. Watch out for humans; other than that, find a place in the city near that tower where we can land. A park, a plaza, a big intersection. Something like that.”

“SCANNING MODIFIED FOR MODERATE-RISK LANDING SITE. SITE SELECTED.”

“Good,” said Jeff. “That was quick. See if you can reach the city’s central computer. Give it fair warning of our landing site so it can tell everybody to get out of the way.”

“LINK ESTABLISHED. WARNING SENT AND ACKNOWLEDGED. CURRENT SPEED REQUIRES WIDE TURN.PREPARE FOR LANDING IN APPROXIMATELY TWELVE MINUTES.”

Jeff grinned. “Good job.”

Eleven and a half minutes later, Jeff stared in tense fascination at the screen as the small ship sliced through the atmosphere at a low angle and came shooting straight toward the skyline. The Minneapolis was versatile enough to act as both a shuttle and starship, which was why he had chosen it. He trusted the computer, which would not allow him to come to harm if it could help it, despite being non-positronic…and yet even the computer couldn’t prevent every malfunction. After all, he had just barely survived one crash here.

He was gripping the sides of the chair and sweating freely as the screen showed a broad boulevard stretching straight ahead. The ship was going to land along the pavement-did this thing have wheels? In a panic, he couldn’t remember.

It must have; the computer wasn‘t stupid.

The streetfronts of a thousand buildings shot by in a blur, first below and then on both sides. The ship touched down and streaked along the empty street, suddenly decelerating sharply.

Everyone was out of the way; the city’s central computer had done its part. The boulevard was as flat and straight as only a city of robots would construct. The ship came to a halt.