There was very little to think about or do, and there were no cycling time periods to deal with, so Dors spent much of her existence in a continuous, fluid robotic suspension, at one-tenth power and with thoughts slowed almost to human levels, cycling through old memories, making connections between one past event and another.

Nearly all those memories and events involved Hari Seldon. She had been designed to protect and nurture this one human. Since she would likely never see Seldon again, she could now be said, quite fairly, to be obsessed with him.

Kansarv, Daneel, and Lodovik entered the quarters through the guest door and waited in the small reception area. A few seconds later, Dors appeared, wearing a simple cloth shift, her legs and feet bare. Her self-maintaining skin seemed healthy, and her hair was neatly arranged, short, with a slight flip at the back.

“It is good to see you again, R. Daneel,” she said, and nodded at Lodovik. She knew of Lodovik, though they had never met before. Kansarv she ignored. “How goes our work on Trantor?”

“Hari Seldon is well,” Daneel said, knowing the question she was really asking.

“He must be aging by now, in the last decades of his life,” she said.

“He is very near death,” Daneel said. “In a few more years, his work will be done, and he will die.”

Dors listened to this with features deliberately frozen. Lodovik detected a small tremor in her left hand, however. A remarkable simulacrum of human emotions, he thought. Every robot must have a set of rudimentary emotional algorithms to maintain personal equilibrium: such reactions help us to understand whether we are performing well and complying with our instructions. But this one-

This one feels very much as a human feels. What must that be like-and how can it be reconciled with the Three Laws, or the Zeroth Law?

“She responds well to work commands,” Kansarv said. “But in truth there has been very little work here for either of us for some years, since the last of the provincial robots were returned for servicing.”

“How are you, Dors?” Daneel asked.

“I am functional,” she said, and turned away. “I am also underutilized.”

“Bored?” Daneel asked.

“Very.”

“Then you will appreciate a new assignment. I will need assistance with the humans being prepared for Star’s End.”

“That could be very useful. Will there be any contact with Hari Seldon?”

“No,” Daneel said.

“That is good,” Dors said. She turned to Lodovik. “Were you instructed to love and honor Linge Chen?”

Lodovik, had he been among humans, would have smiled at this suggestion. He looked squarely at Dors, considered for a very short time, then lifted the corners of his lips. “No,” he said. “I maintained a strong professional relationship with him, nothing more.”

“Did he come to find you indispensable?”

“I do not know,” Lodovik said. “He doubtless found me very useful, and I was able to influence many of his actions to further our ends.”

“Daneel forbade me to influence Hari too much,” Dors said. “I think it was an instruction I carried out very poorly. And he certainly influenced me. That is why I have been so long recovering my equilibrium.”

The robots did not speak for several seconds.

“I hope that no other robot is ever taught to feel more than duty,” Dors continued. “Devotion, friendship, and love are not for us.”

Yan Kansarv inspected Lodovik alone in the diagnostic facility that had been disassembled on Aurora and shipped to Eos, twenty thousand years before. They were surrounded by simple prismatic banks of memory, containing designs of virtually all robots since the time of Susan Calvin-over a million models in all, including Lodovik’s unique plans.

“Your basic mechanical structure is sound,” Kansarv told him after less than an hour spent with the probes and imaging machines. “Biomechanical integration is intact, though you have engaged in some fairly major regeneration of external pseudocells.”

“Neutrino damage, I presume. I could feel the pseudocells failing,” Lodovik said.

“I take some pride in seeing that this regeneration has gone well,” Kansarv said, circling Lodovik on the platform. Lodovik’s eyes tracked the robot in its course. Kansarv paused, swiveled on its three legs, then said, “I should explain that such expressions are only approximate. While I enjoy speaking in human tongues, they are limited for expressing robotic states.”

“Of course,” Lodovik said.

“I apologize for explaining that to you, as you undoubtedly know such things already,” it continued after a short buzz.

“No need,” Lodovik said.

“However, at this stage of the diagnosis, all of your purely robotic algorithms are engaged in self-checking. I dare not use robotic microwave language with you until these portions of your network are allowed to engage again.”

“I feel a certain lack,” Lodovik said. “Deep planning would be difficult now.”

“Conserve through inaction,” Kansarv recommended. “If anything has gone wrong with you, I will discover what it is. So far, I see nothing out of the ordinary.”

A few minutes passed. Kansarv left the chamber and returned with a new interface tool for a particular probe. At no point thus far had he needed to actually violate the integrity of Lodovik’s pseudoskin.

Still humming, Kansarv applied the new probe to the base of Lodovik’s neck.

“There will be an entry now. Warn your tissues not to attempt to encapsulate or dissolve the new organic matter that will enter your system.”

“I will do so once I have my robotic functions returned to me,” Lodovik said.

“Yes. Of course.” Kansarv sent microwave instructions to the central diagnostic processor, and Lodovik felt his control expand. He did as Kansarv had told him to, and felt the probe’s thin leads penetrate his pseudoskin. After a few minutes, they withdrew, leaving two tiny spots of what appeared to be human blood just below his hairline. Kansarv wiped these away deftly, then dropped the swabs into a small vial for assay.

More minutes passed with Kansarv standing in one position, unmoving, though humming now and then. The master robot technician finally inclined its head a few degrees.

“You will relinquish all control at this point. Please pass control to the external processor.”

“Done.”

Lodovik closed his eyes and went away for an indefinite time.

The four robots met in the anteroom to the diagnostic center. Dors still maintained a controlled, somewhat stiff expression and physical posture, like a shy child before her elders, afraid of saying something silly. Lodovik stood beside Daneel as Kansarv delivered his results.

“This robot is intact and has suffered no damage that it has not been able to repair on its own. I can detect no psychological malfunction, no neural-net psychosis, no interface difficulties or anomalies of external expression. In short, this robot will probably outlast me, and as I have frequently warned you, Daneel, I have no more than five hundred years of active service remaining.”

“Is it possible there are problems below your ability to detect?”

“Of course that is possible,” Kansarv said with a sharper buzz. “That is always possible. My mandate does not include deep-programming structures, as you well know.”

“And such problems in the deep structures might result in behavioral anomalies,” Daneel persisted. Clearly, Lodovik’s situation could not be so easily dismissed.

“There is a possibility that concern about damage skewed R. Lodovik’s ability to assess his own mental state. Too detailed self-analysis has been known to cause difficulties in complex robots such as these, R. Daneel.”

Daneel turned to Lodovik. “Do you still have the difficulties you expressed earlier?”

Lodovik promptly replied, “I concur with R. Yan’s theory that I have been autodiagnosing in too much detail.”