He punched the comm code and spoke as soon as the connection was made. Prospero never spoke to anyone via hyperwave until he knew who it was. “Prospero, this is Caliban.”

“Friend Caliban,” Prospero’s voice said through the speaker. “We must meet, most urgently.”

“I agree the need is urgent,” said Caliban. “This is a terrible crisis. But I feel that merely meeting will accomplish nothing.”

“We had a plan as to what to do if things went wrong,” Prospero said. “It is time for us to flee.”

“We never expected things to go this wrong,” Caliban objected. “I have no doubt your escape route would serve quite well under normal circumstances-but these are not normal circumstances. If we decamp now, we will have every human with a badge on the planet after us before nightfall. I have been tracked by Alvar Kresh before. I, for one, have no desire to be hunted again. It was only by the greatest good fortune that I survived the last time.”

“The planet is large, and I have vast experience in covert movement,” Prospero said.

“You have vast experience in arranging covert movement,” Caliban said. “You yourself have never even been off the island of Purgatory. Besides, there is the question of corollary damage. If we were to flee, how many fugitive New Law robots will be destroyed as a consequence? How many of their hiding places will be exposed during the search for us?”

“There is something in what you say,” Prospero said”

Also bear in mind that if we flee, we will be instantly perceived as the prime suspects in the Governor’s death. That would do tremendous damage to the cause of the New Law robots. You have professed many times how nothing was more important to you than the rights-and the survival-of New Law robots. If we flee, we may well be dooming all New Law robots everywhere. ”

“Your points are well taken,” Prospero said. “But if we do not flee-what are we to do?”

“We must turn ourselves in. Submit to their questions. Cooperate. We will be exposing ourselves to grave danger, but, in my judgment, far less danger than in fleeing-and we will not be endangering the New Law robots.”

Prospero did not reply for a moment. Caliban could not blame him for hesitating. The two evils they were forced to choose between were daunting, to say the least. At last, the New Law robot spoke. “Agreed,” he said. “But how are we to do it? I do not wish to walk into a trap, or surrender myself to some SSS agent or Ranger who has been longing for the chance to blast a hole in a New Law robot.”

Caliban had anticipated that question. He could see only one chance for them-a solution that might well be nothing more than a somewhat less elaborate form of suicide than fleeing Purgatory. “There is a robot,” he said. “One that I believe we ought to contact. I believe it is the safest way. If he agrees to take us in without harming us, he will keep his word without trickery.”

“Is this robot a friend of yours?”

“Oh, no,” Caliban said. “On the contrary. If there is any robot in the universe I could count as an enemy, it is Donald 111.”

“Kresh’s robot? Why contact him?” Prospero asked.

“Because there are times,” Caliban said, “when it is wiser to trust an enemy than a friend. ” It was not the most tactful of remarks, under the circumstances. But Caliban felt no compunction about saying those words to his closest friend. After all, it was entirely possible that friend Prospero had gotten Caliban in trouble so deep that not even his deadliest enemy could save him.

Donald 111 banked the aircar slightly more to the east as he flew toward the agreed rendezvous point. He was flying faster than he would have dared if there were a human onboard, but time was short, and he could fly as fast as he wanted since there was no risk of First Law violation.

A scant twelve hours had passed since Grieg’s body had been discovered, though it seemed even to Donald that a lifetime had passed since then.

Donald had need to hurry. He was due back at the Residence for the briefing session with Sheriff Kresh and the others. But this was an opportunity he could not forgo. Accepting the surrender of Caliban and Prospero surely took precedence.

He did not know what to make of it all, but that did not matter. He would meet their conditions and bring them in secretly, without consulting with anyone else. It was not necessary to understand why the two pseudo-robots wished to surrender to him, personally. It was enough to know they wished to surrender. It would be the greatest possible satisfaction to take the two of them into custody.

There. He was at the coordinates Caliban had specified. Donald circled once, low and slow, over the gravel-strewn open field, making sure those on the ground could see him. No surprises.

He brought the aircar into a hover thirty meters above the ground and then brought it down vertically, a slow, careful landing. Donald found himself moving with elaborate care, concentrating on the importance of not moving suddenly. Strange, very strange, to be considering the possibility that two robots-even pseudo-robots-might have lured him here as part of some trap. There was nothing to prevent them from greeting Donald with a blaster shot between the eyes.

Nor, Donald realized with surprise, was there anything preventing him from dispatching them. There was nothing at all in the Three Laws to prevent one robot from destroying another. Nothing at all about a robot wielding a blaster, or even firing it-so long as the robot did not fire at a human. Were the two of them out there, hiding in the scrubby line of trees that surrounded the clearing, wondering if he, Donald 111, were about to charge out of the aircar, guns blazing?

Absurd nonsense. Just because there was no prohibition against a thing, that did not render it plausible or sensible. A strange point to consider. It was just the sort of argument used to defend Caliban. Donald got up out of the pilot’s seat, opened the hatch of the aircar, and stepped out onto the ground without giving way to any further nonsense.

There. At the edge of the clearing. The two pseudo-robots, Caliban and Prospero, the one tall and red, the other shorter and jet-black. They moved forward cautiously, and it did not escape Donald’s notice that they both kept their hands in plain sight at all times.

Donald offered no greeting or salutation, but instead launched directly into formal procedure, using the formula they had negotiated via hyperwave link. “ As per our agreement, I hereby remand both of you into the custody of the Hades Sheriff s Department, seconded to the Governor’s Rangers. You are therefore submitted to the authority of the Sheriff and his duly designated deputies, as well as to the authority of the Governor’s Rangers. So long as you do not resist such authority, and do not attempt to escape, you will not be harmed, punished, or destroyed without due process. ” But what was due process in such a case? Donald did not know. Did anyone? And could he really make such promises when he had not informed Sheriff Kresh that he was making this arrest? “Do you understand?” he asked the two pseudorobots. It was a most strange moment. When else, in all of history, had one robot in effect arrested two other robots-or near-robots-for murder?

“I understand,” Prospero said.

“As do I,” said Caliban.

“Then come,” Donald said, gesturing for them to go into the aircar. Caliban and Prospero walked past him, and through the aircar hatch. Donald followed behind, climbing aboard and closing the hatch behind him. The two of them had seated themselves in the passenger seats. Donald took his place at the controls and began preparations for takeoff.

It was over. He had them. He had to get back. He would be barely in time for the briefing as it was. He knew he should lift off immediately, without delay. But the empty formalism of taking them into custody was not enough. It was anticlimactic, unsatisfying. It did not answer the central question of the case. And Donald, as befitted a police robot, had a most powerful sense of curiosity.