Wolruf was already there, peering into a short-range navigation holo-screen while she wove the attitude control joystick through a gentle loop that brought the ship around to aim toward Mandelbrot. Internal gravity kept them from feeling the acceleration, but through the view screen Derec could see a tiny stick figure grow into a robot as they drew near. Mandelbrot held his arms and legs out as far as they would go, either to help his rescuers see him or to minimize his spin. Wolruf slowed the ship with the forward jets rather than spinning it around and braking with the main engines, so they got to watch him grow larger and larger until he thumped spread-eagled into the viewscreen.

Derec and Ariel both flinched, and Wolruf laughed. The viewscreen was much more than just a simple pane of glass; it was an array of optical sensors on the hull transmitting a composite image to the display inside. The hull in between was just as thick as anywhere else on the ship. Derec knew that, but it worked like a window just the same, and his reflexes treated it as such.

Mandelbrot crawled off the sensor array and disappeared from view. Thank you, he sent, and moments later he added, I am inside the engine room again.

How bad is it?Derec asked.

Very bad,the robot replied.

“It looks like the old question of who quits breathing first,” Avery said. They were sitting at the table in the common area, three humans and a caninoid alien. The four robots stood against the walls around the table, Mandelbrot behind Derec, Lucius behind Avery, and Adam and Eve together behind Ariel. Wolruf sat alone at her end of the table. It was more than coincidence. With a life threatening crisis on board, the robots’ First Law imperative to protect humans from harm didn’t extend to her.

Avery looked genuinely worried for the first time in Derec’s memory. His face was pale and drawn, an effect his white hair and sideburns only accentuated. He held his hands together in front of him on the table, neither gesturing with them nor drumming with them as he would have if he was just speaking normally.

“The recycler is toast,” he said in a voice devoid of emotion. “We have enough air left for three days for the four of us, four days if we sleep all the way. It’s five more days to Ceremya. That means one of us has to stop breathing, and I say the obvious choice is Wolruf.”

“I’ll try,” the alien said, puffing out her cheeks and rolling her eyes around in their sockets. When that failed to get a laugh, she let her breath out in a sigh and said, “Thought a little ‘umor might lighten the mood. Sorry.”

“This isn’t a laughing matter.”

“I don’t even think it should be a matter,” Derec put in. ‘\We should be spending our time thinking of a way to keep us all alive, not arguing about who we sacrifice. What about using Keys?”

The Keys to which he referred were Keys to Perihelion, Avery’s name for an experimental teleportation device he had either created or discovered when he built the first Robot City. With a Key, a person or a robot could make a direct point-to-point hyperspace jump without a ship.

Avery shook his head grimly. “That would be a good idea if we had Keys, or facilities to build them. We have neither.”

“Why not? I’d think that’d be an elementary precaution.”

Avery scowled. “Hindsight is wonderful for making accusations, but I didn’t notice you bringing any Keys aboard, either.”

Derec blushed. True enough. He’d trusted completely in the robots who built the ship. “You’re right,” he said. “I didn’t think of it, either. But we’ve got to be able to do something. How about making more oxygen? We have water, don’t we? Can’t we electrolyze oxygen from that?”

Adam spoke up. “Unfortunately, the ship’s water supply went through the recycling unit as well. When you vented it to space to put out the flames, the water boiled away. We have no water. This means that the automat will no longer function, but I believe that is a secondary concern. Humans can survive five days without food or water, can you not?”

“Longer,” Derec said, remembering times when Wolruf had gone without food or water much longer than that in her effort to help her human friends. She had never abandoned them; could they do any less for her now?

“If there was a way to make more air, the robots would have thought of it,” Avery said. “I’m sorry, Wolruf, but there’s really only one solution. One of us has to go, and it’s got to be you. We couldn’t sacrifice ourselves if we wanted to. The robots wouldn’t let us.”

Derec wondered if Mandelbrot would allow them to sacrifice Wolruf, either. He, at least, still considered her human, or had yesterday. But he wasn’t protesting this conversation, which meant he was at least questioning his definition in light of the new situation. He would be in danger of burning out his brain if he couldn’t resolve it, but Derec supposed he was probably safe at least for the moment. Mandelbrot had originally been a personal defense robot; he could handle potential conflicts better than most. With him, a conflict wouldn’t become crippling unless action demanded it be solved immediately.

Mandelbrot knew that too, which could also explain his silence.

“What about going somewhere else?” Ariel asked. “Maybe there’s a habitable planet closer by.”

“There is not,” Eve said. “We are headed away from human-inhabited space; there is no known world closer than our destination. We have only made one jump from Robot City, but we are nearing our second outward jump point, so returning there would still require five days as well, since we must cancel our intrinsic velocity and re-thrust toward the return jump point. I have examined the planets in this solar system, but none has a breathable atmosphere. Our next two waypoint stars may have habitable planets, but we cannot allow you to risk all of your lives on that possibility.”

Avery nodded. “You see how it is.” He turned to Lucius. “There’s no sense in drawing this out. I truly regret having to do this, but, Lucius, I order you to-”

The robot was already in motion, obeying his gesture even before his order.

Mandelbrot took a jerky step to intercept him, but Derec interrupted them both.

“No!” He pounded his fist on the table. “I order all of you to consider Wolruf to be human. Protect her as you would protect us. We all get through this together or we all die together.” Mandelbrot stopped instantly and totally. If he hadn’t remained standing, Derec would have thought the conflict had burned him out. Lucius also stopped, his head turning to Derec and back to Avery while he fought to reconcile his own inner discord. His was not as serious a disturbance as Mandelbrot’s, since he didn’t believe Wolruf to be human. His was only a question of how to obey two opposing orders.

Derec tried to increase the potential and turn it into a First Law conflict at the same time. “It may be that your definition of ‘human’ is wrong. You thought that you were one once, just because you were a thinking being. Now you’ve gone to the opposite extreme. Can you trust your new definition enough to toss another thinking being out the airlock?”

Lucius took a step backward until he stood beside Avery and turned his head to look straight at Wolruf. Derec could almost see the struggle of potentials within the robot’s positronic mind. He wouldn’t have been surprised if he locked up from it, but if it saved Wolruf, it would be worth the loss.

Avery shook his head. “A noble sentiment, but what’s the use in all of us dying when three of us can live? Do you want to see Ariel suffocate one day away from salvation? Carrying your child? I won’t ask how you’d feel about it happening to me, but how about yourself? Do you want to die for the sake of friendship?”

“Avery ‘as a point,” Wolruf said. “Better one of us dies so three of us live. I’d just rather it be ‘im, is all.” She grinned across the table at him, adding, “But I know ‘ow your robots work, too. No matter what you call ‘uman, I’m the least ‘uman of us all; it won’t take long before they ignore Derec’s order and toss me out on their own.”