“But, but, a matter like this-something this big-you have no right to decide it on your own,” Fredda said. “There has to be a referendum, or a special Council session, or, or something.”

“No,” said Kresh. “That can’t be.”

“You’re going to play God with the whole planet, with all our lives, all by yourself? You can’t do that!”

“In a perfect world,” said Kresh, “what I’d do is discuss it with everyone, and have a nice, thorough debate of all the issues at hand, with a nice, fair, majority-rule vote at the end. Because you’re right. I have no right to decide all by myself. But I have no choice but to decide all by myself. Because I also have no time. No time at all.”

“Why not?”

Davlo Lentrall nodded absently to himself and looked toward Fredda. “That’s right,” he said. “I don’t think I explained that part of it to you this morning, did I?”

“What part?” she demanded.

But Lentrall seemed, somehow, reluctant to say anything more, and simply looked toward the governor.

“Alvar?” Fredda said, prompting him.

“The part about time,” said Kresh. But he seemed as unwilling as Lentrall to say more.

“Go on,” she said. “One of you at least, please go on. What about time?”

Kresh nodded toward Lentrall. “The comet was rather close when he discovered it,” he said. “And, of course, it is getting even closer with every passing moment. Even for a comet, it’s moving at extremely high speed, relative to the planet. It will be here very soon.”

“Just how soon is soon?” Fredda asked.

“If we leave it alone, it will make its closest approach to Inferno in about eight weeks. Fifty-five days from now. If we divert it, it will hit the planet at that time.”

“Fifty-five days!” Fredda cried out. “But that’s too soon! Even if we did decide to do this…this mad thing-we couldn’t get ready in that little time.”

“We have no choice in the matter,” said Davlo, his voice wooden and emotionless. “We can’t delay it. We can’t wait until it comes back around, centuries from now. It will be too late, by then. The planet will be dead. But he hasn’t told you the worst part yet.”

“What?” Fredda demanded. “What could be worse than only having eight weeks.”

“Only having five,” Kresh said. “If we are to divert the comet, we have to do it within the next thirty-six days. After that, it will be moving too fast, and be too close for us to deflect it enough.”

Justen Devray shook his head in wonderment. “It can’t be done,” he said. “And even if it could-how can you crash a comet into the planet without killing us all?”

Governor Alvar Kresh laughed, a harsh, angry sound that had nothing of joy or happiness about it. “That’s not the question,” he said as he looked out over the wreckage that surrounded them all. “The planet’s recovery is on a knife edge. It’s incredibly fragile. Any of a hundred things could destabilize it, wreck it, send it into an ice age we’d never get out of. If the comet drop works, it could save us all. And yes, if we get it wrong, it could kill us all. But it might be that only the comet can save us. There is no way to know for certain. So the question is this-is there anything, anything at all, I can do, that won’t get us all killed?”

CALIBAN FOLLOWED A precise two steps behind Prospero as they made their way down the pitch-black underground passage. Prospero, understandably concerned about the dangers of an ambush, had shut off his built-in infrared emitter, and insisted that Caliban do the same. Prospero was navigating down the corridor by sheer dead reckoning. In theory, there was no particular reason why a robot could not move from a known position to another known position, working strictly from memory. In practice, it was a difficult thing to do, especially moving at any sort of speed, while trying to move quietly as well, and Prospero was doing both those things.

But it seemed as if Prospero was having not the slightest difficulty in hurrying through the blackness. Caliban found that the same could not be said for himself. He did not know this part of the tunnel system and could not work strictly by memory. He was relying solely on his sense of hearing to guide him, listening to the faint sounds of Prospero’s movements, the soft padding noise of his feet hitting the stresscrete floor of the tunnel, the low whir and hum of his actuator motors, the faint echoes of those sounds rebounding off the tunnel walls. His task was made no easier by the far-off sounds of activity in other parts of the tunnel system, coming but faintly to his sound receptors. It was no easy task to filter such noises out and concentrate on the sounds of Prospero’s progress.

In short, a robot blinded by complete darkness was being followed by a robot guided by sounds he could barely hear.

Two or three times, Caliban nearly missed a turn. Once he brushed up against a wall, a jarring, startling impact. In the near-silence, the clattering sound of his hitting the wall seemed to echo through all the hallways and draw attention to them. But there was no reaction.

At last Prospero stopped so abruptly that Caliban nearly walked into him. As Caliban had no hyperwave receiver, and could neither see nor hear Prospero, there was no way for Caliban to know at first what had made Prospero stop. After a pause, Prospero moved on again for thirty or forty meters-and then the world lit up in fire and thunder.

Blaster fire! Dazzlingly bright and deafeningly loud. Caliban’s sound and vision receptors adjusted themselves all but instantly, but not fast enough to keep him from being badly disoriented.

Prospero dove for the right wall of the tunnel, and Caliban for the left. No sense in hiding themselves now-not when they had already been spotted. Caliban switched on his infrared emitter system and his infrared vision. There! Up ahead in the tunnel, a burly man, standing in the entrance to a tunnelside office, peering into the darkness, his blaster still at the ready. More than likely he had been dazzled by his own blaster fire. The man fumbled with his free hand and pulled a handlight out of one of his pockets. Caliban rushed forward before the man could switch it on and bring the light to bear. He grabbed the blaster out of the man’s hand and knocked the light from the other.

The man flailed around blindly with his arms until he managed to put a hand on Caliban. He ran his hand over Caliban’s chest and up to his head. Caliban grabbed at the man and held him at arm’s length.

“Don’t hurt me!” the man cried out.

And that was a remarkable thing for a human to ask of a robot. Even New Law robots were prohibited from harming humans. Caliban, the No Law robot, was the only robot in existence who could, in theory, hurt a human being. Either the man was a Settler with no experience whatsoever of robots or else

“You know who I am,” Caliban said.

“Now! I do now!” the man said. “You’re Caliban. Aren’t you? And I could hear two of you. The other one is over there somewhere. That’s Prospero, isn’t it?” He pointed in the general direction of Prospero, who was walking toward Caliban and his prisoner.

“Why did you fire on us, Fiyle?” Prospero demanded.

“Because you were sneaking up on me. No lights, almost no sound. I thought you were…were someone else.”

“Who?” Caliban demanded.

“I don’t know,” Fiyle said, sagging back a bit, relaxing in Caliban’s grasp. “You could have been anyone. All hell is breaking loose up there, and I think it’s possible that I’ve made myself just a little bit too popular. “ Fiyle hesitated for a moment, and then spoke again. “Look, you’ve got my blaster, and that’s the only weapon I had. You can search me for other weapons if you like, but would you mind turning me loose and letting me switch on a light? I’ve driven myself half crazy sitting here in the dark.”

“It is all right, friend Caliban,” said Prospero. “Let him go.”