At any rate, the order had been given to Bogie, and the Watchful Eye was not Bogie. If it were human, it had the power of choice; if it were robot, it did not have to follow orders given to another robot; if it were animal or alien, it could follow animal or alien instincts.

Since Derec might spread the word that it was not Bogie, there was no reason to stay out here in the streets, where the others could track it down and trap it.

As it headed toward the tunnel that led directly down to the central computer, it wondered if it could even continue its activities in Robot City. With Derec and Ariel there, it had enemies, and it could not abide enemies. Nevertheless, it didn’t want to eliminate them, as sensible a solution as that might be. Something inside it prevented it from killing.

Suddenly it realized how it could give the intruders a setback, assert its power, allow itself to maintain control of the city, mold an environment that would be suitable for it instead of humans, and make it the powerful entity it had decided to be.

It would just accelerate the program it had planned all along by skipping a few steps and going directly to the main goal.

It would destroy, then rebuild, Robot City.

Wolruf had left Ariel and the others for her nocturnal roaming of the city. She had come from a place whose inhabitants traveled through the night compulsively, searching for answers to questions they had not always known they had. While she subdued the urge at most times, tonight, after watching the end of the dancers, she had known she must be alone. She climbed over the smaller buildings, raced down dark streets in long loping strides, crouched at the edges of roofs.

Rounding a corner, she collided with a robot she recognized as Bogie.

“Bogie! What arre ‘u doing here?”

But the robot did not answer. It merely leaped over Wolruf and raced on, around the corner from which Wolruf had come.

“Stop!” said a voice. It was Mandelbrot, coming toward Wolruf so fast he would have run her down if she had not jumped adeptly out of the way. The robot Timestep tapped along behind Mandelbrot.

“There iss something wrrong, Mandelbrot, I can ssee,” Wolruf said. “ ‘0 only crush when ssomething iss wrrong.”

“Excuse me, Wolruf,” Mandelbrot said. “We are on urgent business. I cannot stop to explain.”

He sped past her. Her curiosity aroused, she raced after him on all fours. Timestep danced his way after them.

“I can help ‘u. Arre ‘u following Bogie?”

“No.”

They rounded the corner. Wolruf saw Bogie, still moving rapidly, up ahead.

“‘U sseem to be following Bogie.”

“No.”

“What arre ‘u doing?”

“Trying to overtake the Bogie that is not Bogie.”

“The Bogie not Bogie? Explain, pleasse.”

As they rushed along, Mandelbrot told the alien what had happened.

“Then ‘u arre to brring that rrobot back to Derec?”

“Yes.”

“Let me catch him forr ‘u.”

With a strong, leaping thrust, Wolruf surged ahead of Mandelbrot and Timestep. Her body low to the ground, she closed the gap between herself and the Watchful Eye in a matter of seconds. Her prey was not even aware of her pursuit.

With her last few powerful steps, Wolruf propelled herself into the air. Her leap was magnificent, a smooth arc that reached such an impressive height she was able to dive down upon the fleeing robot. Her forelegs hit its shoulders with a mighty impact, knocking it forward onto its face. Wolruf landed on top of it. She was able to hold it down long enough for the others to arrive.

Rolling off the Watchful Eye, she looked up to see Mandelbrot standing over them.

“Whoever you are,” Mandelbrot said, “Derec orders you to return to him with us.”

“Whoever?” the Watchful Eye said. “I am Bogie.”

“No, you are not. I can see that now.”

“What makes you think so?”

“You have not copied Bogie’s voice accurately, although the ability is programmed into you. There was a rough sound in Bogie’s voice that yours lacks.”

Another mistake, then. The Watchful Eye should have adapted its voice to the robot’s. For a moment, it wondered if it should have bothered with Bogie at all. For a botched piece of strategy, that robot was now parts on the Repair Facility floor. The Watchful Eye could not feel regret, but it was conscious of the waste caused by ineffective action.

“If you know I am not Bogie,” it said, “then you may guess that I don’t have to do what you say.”

Without waiting for Mandelbrot to continue the discussion, the Watchful Eye kicked out at Mandelbrot’s leg, The surprise move made Mandelbrot topple over, landing with an impressive clanking sound upon the pavement.

The Watchful Eye stood up quickly, feeling more in control of its unaccustomed robot body than before. It turned to find Wolruf leaping toward it. With a vicious backhand blow, it struck Wolruf in the neck. Choking, falling backward, Wolruf collapsed. She landed awkwardly on her back legs. causing them both to throb with intense pain.

The Watchful Eye jumped over the fallen alien and tried to continue its run, but Timestep, with a dancing twirl, tripped it up. It stumbled, but this time did not fall. When it regained its balance, it ran at Timestep so quickly that the robot did not have time even to consider his Third Law responsibility.

It wrestled Timestep to the pavement but then, in an abrupt move, broke its hold and raced away. It had progressed half a block before Mandelbrot stood up. However, since he regarded Wolruf the same way he did humans, First Law compelled him to kneel down beside the fallen alien to see if she was in need of help.

“I am fine,” Wolruf said in a faint voice. She could barely talk. “ ‘U go on. Continue purrsuit. I will go to Derec.”

Wolruf watched Mandelbrot and Timestep chase after the strange robot. When they were out of sight, she struggled to her feet. The pain from her legs seemed to be traveling through her whole body.

Her run to Derec was done at a much slower pace then usual.

The Watchful Eye wished it had been able to imitate a robot’s speed, but its mimicry did not automatically give it full physical control. Unlike a normal Avery robot, it skidded around corners and bumped into obstacles. Each little delay was allowing its pursuers to get closer.

It had one advantage over Mandelbrot and Timestep. It knew where it was going.

The tunnel was not too far away now. After looking back at its pursuers, it quickly calculated the time it would take them to close the gap between them and it. It was likely they would overtake it a few meters from the tunnel entrance.

It needed a diversion.

It flashed into its mind a map of the area and discovered that there was a building coming up on its right that stored several of the results of its genetic experiments. This had been one of its latest experiments, and many from this batch of creatures were still functioning.

If it went through this building, which had a rear exit, and could slow down its pursuers by doing so, it could reach the tunnel entrance easily.

As Mandelbrot’s footsteps became louder, sounding as if he were ready to climb onto its back, the Watchful Eye took an abrupt right turn toward the building. It ran at such velocity that it hit the entrance with an impact that sent the thick door flying open.

Inside, bright light illuminated an enormous room. Spread across its floor, on shelves, sprawled over furniture, was a large group of rejects from the Watchful Eye’s experiments.

The beings of this particular group, the one it had created just before the arrival of the intruders, were somewhat larger than the dancers and built with less delicacy. They were thick-muscled, with bulges all over their bodies, bulges that did not actually correspond accurately with the protuberances of the human body.