Derec knew what the supervisor robot wanted before Gamma entered the room. The chemfets had told him, whispering into his mind.

“We’re going to have to change your name,” he told the robot. “Gamma-it shows a definite lack of imagination. But it can wait. What’s up?”

“There are wolf-creatures on the far hill, Master Derec. They are approaching the city boundaries.”

“I’m aware of it. They didn’t give us much time, did they? Is everything ready?” There was little need to ask-he could have found out via the chemfets, but somehow it seemed more reassuring to ask the supervisor. There was only so much information he could absorb from the flood the chemfets allowed him. Even if he wanted to control every function of the city, it would have been impossible.

When the chemfets injected into him by his father had first asserted their presence, Derec had thought that he was going insane. He couldn’t control them, couldn’t handle the eternal input. But he’d learned how to filter out most of it, learned to let the city take care of itself. The supervisors were invaluable, and the lesson Derec had been taught in the original Robot City was to delegate his authority. It was the only way to remain sane.

Derec yawned. He’d tried to sleep that afternoon, knowing the wolf-creatures would come at night, but he’d been too wound up. He yawned again, forcing oxygen into his lungs.

“Everything is set as you instructed, Master Derec.” The supervisor robot, identical to its counterparts Alpha and Beta, went to the balcony high up in a building near the Compass Tower. City lights gleamed red and yellow on the robot’s burnished skin. Mandelbrot came from the next room and went onto the balcony with Derec.

“I see them,” Mandelbrot said. “There-just below the tree line. There are six or perhaps seven of them.”

“Get your eyes fixed at last and you have to show off,” Derec chided Mandelbrot jokingly, but the robot missed the humor entirely.

“I am sorry, Master Derec,” he said. In retrospect, it was the only reaction Derec should have expected, but Derec suddenly knew how much he missed human company. Ariel, especially. I need to talk to her. Sometimes I feel half-robot myself with the chemfets chattering away inside.

There had been no time to contact her. Derec had known the wolf-creatures would come to the city again, and quickly. It was what Dr. Avery would have done, after all, and the rogue had to be Avery’s-it just made sense.

He didn’t think it would be much trouble dealing with it. In fact, his mood was rather jovial. Scrubbing away the filth of their journey through the forest and being in the city made him feel almost human again. He felt safe here, and with the resources of the city, nothing was impossible.

He’d be home again, soon. He’d see Ariel and patch up the rift caused by their fight.

The rogue was not a problem. The wolf-creatures he was more concerned about, but they should be easy enough, too. A general reprogramming of the city, an understanding of their language so they could communicate, and some compromise could be reached. This stupid war with the city would end.

Derec squinted into the night, cradling his sling in his good hand so that his injured arm wouldn’t brush up against the railing. It was impossible for him to see anything at all. He couldn’t even make out the individual trees, a kilometer and more away in the murk. The sky was overcast; even if this world’s two moons had been up, their reflected light would never have penetrated the cloud cover.

“I told you they’d move,” he said. “Can you see the rogue, Mandelbrot?”

“No, Master Derec, I do not. But it could still be there, back in the trees.”

Derec shook his head. “No. Not that one, not if it’s really the leader. If these beings are anything like the old wolves, they’re pack animals. The leader would be first, or the others wouldn’t follow. Remember Wolruf? Always headlong into the fray…” Derec grimaced. “I suppose it’s possible it’s already among the buildings, maybe in some other form. We might have missed it. “

He shrugged. The city was alert now. The chemfets in his bloodstream fed him a continuous stream of information over the security channels. “Supervisor Gamma?”

“Yes?”

“You’re certain the robots will consider the wolf-creatures human? You’re certain they won’t allow them to be harmed?”

“You have instructed them so yourself, Master Derec. If there were direct danger to you from one of them, I believe we would protect you first, as you most fit our programmed definition of ‘human,’ but otherwise, yes. We will not harm them.”

“I can’t stress that enough. The city can always build more robots. I don’t care how many robots these wolf-creatures might destroy-I don’t want them hurt. We can find some other way to coexist with them.”

“That is understood, Master Derec. Mandelbrot has explained much to help us reinforce your orders.”

Derec could feel adrenaline building inside him. He wanted to run back into the room and out to the edge of the city. He wanted to be there. He’d made plans to do so, but the idea had distressed Alpha, the supervisor to whom he’d first broached the subject. “That would be extremely dangerous,” the robot had said, very slowly and carefully. “I do not know that the Laws would permit it…The rogue robot…”

Derec could have argued; it hadn’t seemed worth the trouble. Even Mandelbrot had agreed: the rogue was an unknown and obviously dangerous. Despite Derec’s assurances that even a rogue would follow the Three Laws and thus be unable to harm him, all the robots had been noticeably “pleased” when he agreed to remain in the city. Okay. He’d play general this time, staying behind the lines and directing his forces. He noticed that the supervisors had also placed a cordon of Hunter-Seekers around his building, but he didn’t comment on it.

“Give me the visual, Gamma. And make sure we’re recording-we’re going to need every scrap of sound these creatures make to start deciphering the language.”

The wall of the building directly across from them was a milky white, translucent plastic. Now it glowed with inner light, and a huge image of the forest gleamed there, red with enhanced infrared imaging. Derec could easily see the wolf-creatures moving cautiously through the tall grass toward the city.

“Mandelbrot,” he said, leaning forward slightly and pointing to the wolf in the front of the pack. “Isn’t that the old one from the glade? See-it has the same gray fur around the muzzle, the same markings.”

“I see him, Master Derec.”

“He might be the best one to capture. He might remember that we didn’t harm him last time. He might even cooperate. Gamma?”

“I have already so instructed all units, Master Derec.”

“Good. I imagine we’ll have to put most of them to sleep before they’ll give up this attack. They seemed rather aggressive.” Derec patted his arm and the bandages swaddling the claw wounds. He watched them moving slowly toward the city. “They’re magnificent creatures in their own right,” he said. “Look at them. So strong and sleek; we saw what they could do to a robot.”

He could see now that several of them were wearing bright wire collars: totems against the city, perhaps, or simply trophies of past victories. The sight made him nod. “Mandelbrot, you were absolutely right. They are human. Maybe if Wolruf were here…”

As the pack approached, Derec sent messages through the chemfets. Several Hunter-Seekers advanced from the outbuildings of the city in a line. Half of them carried neural disruptors hastily built during the previous day: the computer models of the wolf-creatures indicated that the disruptors would interfere with the electrical impulses of the wolf-creatures’ brains and cause mental confusion. The jury-rigged models had also been prone to leakage and had disabled more than one of the robots as well. As a backup, other Hunter-Seekers loaded with sedative darts also moved toward the invaders. Worker units waited to capture one or more of the creatures in hopes of learning to communicate with them.

Derec didn’t think they’d go quietly. He fully expected a bitter battle before the wolf-creatures would be overcome.

He was wrong.

Halfway down the hill, the old one simply stopped. In full view, making no effort to hide himself, he rose up on his hind legs, pointed to the Hunter-Seekers, and howled in that eerie language. The gesticulation needed no translation-it was obvious enough: Come and get me.

There were evidently certain universals when it came to body language.

“That doesn’t make any sense at all.” Derec squinted at the meters-tall image of the wolf. “You’d think a pack animal would just attack. “

“They are not just animals,” Mandelbrot reminded Derec.

“Yeah. And I’ll bet the rogue’s taught them a few sneaky tricks of its own.” He grimaced. “Well, he’s obviously not going to come to us. Obviously they want the fight to come to them. Gamma, let’s send the Hunter-Seekers forward.”

But it was not a fight they wanted. Not at all. As the Hunter-Seekers advanced, the wolf-creatures retreated. Step by grudging step. They stayed out of range of the disruptors and the darts, though Derec suspected that was accident rather than anything else.

Derec tried direct communication through the Hunter-Seekers, hoping they might understand the tone of his voice if not the words. They simply howled back at it.

He sent an unarmed worker forward, arms outstretched peacefully. When it reached the pack, they tore it apart.

At last, frustrated, he sent the Hunter-Seekers forward at a quick trot. The wolf-creatures melted back into the woods, and Derec called the Hunter-Seekers back.

As a confrontation, it was an elusive, aggravating thing. As an effort to solve the conflict, it was an utter failure.

“Frost,” Derec muttered as the wall across the street went dark again and the city lights reasserted themselves. “Now just what in space was that intended to prove?”

SilverSide listened to the chorus of head-voices, waiting. She was just to the south of the city, having circled halfway around it from PackHome.

Already she could hear the alarm spreading as LifeCrier showed himself and the other kin at the edge of the forest to the west, and she could hear the new voice that directed the city functions, instructing even the triumvirate of Supervisors.