The Watchful Eye detected the activity at the tunnel entrance, but assumed it would take a long while before they could get through. It knew nothing of the abilities of Mandelbrot’s arm and did not detect Wolruf’s penetration of its improvised security barrier.

As it continued to pick and choose what part of Robot City it would destroy, it concentrated so completely on its efforts at annihilation that it did not detect Wolruf’s appearance in the computer chamber.

To make matters worse, it had been careless upon its return and left both the sliding door and wall open, so that Wolruf could silently creep into the mainframe area. She was happy to see that the Bogie that was not Bogie hadn’t even looked up from its work.

On a screen above the imposter Bogie, a spired building appeared. With a deft hand movement, the robot touched some keys on a massive keyboard. The screen showed the spired building appear to sink into the ground, as a ship might be swallowed by the sea.

Something must be done now, she thought. Derec had said something about a diversion. What kind of diversion was possible under these circumstances? she wondered. She decided none. Trickiness was not her way. Attack was her way. Her throat tightened as she remembered the pain of the pseudo Bogie’s last blow. But she hadn’t been prepared for that. Now she was ready.

Soon Mandelbrot had fashioned a hole large enough for Derec, Ariel, and Avery to pass through.

“Let me go first,” Avery said. “I know the networks and byways of this underground setup better than you possibly could. Better than anyone else could. Except, apparently, our little Pinch Me.”

He manipulated his body through the opening without waiting to see if anyone disagreed.

“Pinch Me, huh?” Ariel said.

“I’d love to,” Derec said, “but I’m kinda busy right now.”

“Ha ha. I hope somebody explains the significance of the name to me sometime.”

“It’d be a pleasure. You go next. Mandelbrot, you’ll never get your bulk through this pinhole. Go to the Compass Tower and man the computer terminal there. As soon as you get a signal from me on the screen, begin restoring the systems that are still out of order. I’ll work from my end with the chemfets. I want Robot City to be fully functional the next time we get together.”

“Yes, Master Derec. I will try.”

Timestep came forward, clearly expecting to be taken along. But he wouldn’t be able to work himself through the hole either, so Derec said, “And, Mandelbrot, take Timestep with you.”

“What is my assignment, Master Derec?” Timestep said.

Derec wished he could give him something legitimate to do, but this was no time to be concerned with manpower assignments. “Entertain Mandelbrot. Dance for him.”

“He never stops dancing,” Ariel muttered.

Mandelbrot and Timestep set off down the street as Ariel squeezed into the passageway, then Derec. Fortunately for them, the Watchful Eye did not observe their entrance. It was too busy with Wolruf.

Adam and Eve reached the tunnel entrance just after Derec had climbed into the hole. They had seen the bottoms of his boots shaking as he wiggled through the opening. Then the boots disappeared.

“What are they doing, do you think?” Eve asked.

“I would surmise that they are heading for the main computer.”

“Why?”

“I cannot know, but I would surmise that the present crisis in the city originates there.”

“We should follow them.”

“I agree.”

The hole was too narrow for them to go through in their kin shapes. Together, without consulting, they began to change, elongate. Restoring their basic Derec and Ariel facial features, their bodies became snakelike and sinuous, if snakes had long thin arms and legs to go with their bodies. When their mass had narrowed sufficiently, they were each about seven and a half feet long. Eve first, they slithered through the narrow opening easily.

At that moment the Watchful Eye had Wolruf, her jaws clamped around its wrist, hanging from its forearm. It tried to fling the alien away, but she hung on tightly. Slapping at her with its other arm didn’t have much effect either.

It was time to use its transmogrification potentials. concentrating on its arm, it flowed more mass into it, forcing the arm to swell up. Wolruf tried to bite harder, giving the hinge of her jaw great pain. The Watchful Eye’s arm enlarged more, prying Wolruf’s jaws apart. She dropped to the floor.

As the Watchful Eye brought its other arm down toward Wolruf’s head, she dodged sideways, then rammed the Bogie who was not Bogie in the legs. Like one of the buildings it had destroyed, the Watchful Eye toppled over, falling over Wolruf and hitting the computer chamber floor with a resounding thud. Wolruf scampered sideways to avoid being crushed.

The fall did not hurt it, but it wound up in an awkward position. Wolruf, who had realized she could not possibly defeat this metallic monster, hoped she could hold it off until Derec and the others arrived.

Avery led Derec and Ariel down several corridors, all of them dark or only partially lit, another feature of their enemy’s tampering with Robot City. At a junction whose tunnels led in three separate directions, Avery stopped suddenly. He looked from one tunnel to another, his face confused.

“What’s the matter,” Derec asked.

“The damn creature, robot, whatever he is-he’s altered the network of tunnels down here. They’re not laid out according to the original pattern. He’s rearranged them just like he’s redesigned the city.”

“Can we find our way?” Ariel asked. “Wolruf may be in trouble. You know her, Derec. She won’t wait for us long. She’ll go on the attack.”

“Don’t worry, don’t worry,” Avery said. “I can work this out. I built this city, remember? No robot can fool me for long. We’ll go this way.”

He plunged into the right-hand tunnel with his usual recklessness. Used to it now, Derec and Ariel followed close behind.

The false Bogie struggled to a sitting position, and Wolruf jumped onto its back, pushing it forward, ramming its head against its legs. Only the suddenness of her attack allowed it to succeed. Wolruf could tell the robot was too strong for her. It had all the tireless force of any robot. And it was bound by Third Law to fight back so long as it continued not to perceive Wolruf as human.

She tried to hold its torso down, but it only had to push against the floor with its hands for sufficient power to fling Wolruf off its back and send her flying through the air. Instinct took over, and Wolruf landed on her feet, wobbly but still in control of the situation.

It was straightening up its back while at the same time turning around to face Wolruf, ready to fend off another leap. Wolruf looked up and saw an empty shelf high up on the wall next to her. Crouching down, she pushed hard with her legs and flew up onto the shelf. The Bogie that was not Bogie could just barely track her with its optical circuits. She had hardly landed on the shelf when she jumped again, this time at an arc that led downward to the robot. Kicking out with both feet, she struck the Bogie imposter on the forehead, snapping its head back. It fell heavily. Wolruf landed on the floor, too, on her back. When she stood up, she could barely walk. The leg injury from her previous battle with the robot flared up again.

And the false Bogie had somehow gotten to its feet and was hovering over her.

She tensed herself for a killing blow, but instead the robot merely looked down at her and said, “Why are you trying to hurt me?”

Its voice sounded hurt, but not in physical pain, as if its feelings had been hurt more than its body.