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"Gryf was sick."

"You okay now?" Jason asked.

Gryf nodded, and he and Kylis sat down in the circle of bioluminescence that did not waver in the wind. Jason put his book away and got their rations and water bottles from the locker. The stalks Kylis had picked were by now a bit wilted, but she gave them to Gryf anyway. He shared them out. The meal was slightly better and slightly more pleasant than most at Screwtop, but Kylis was not hungry. She was ashamed to tell her friends what had happened.

"What's the matter?" Jason asked suddenly.

"What?" Kylis glanced up at him, then at Gryf. Both were watching her with concern. "You look upset."

"I'm okay." She leaned back gradually as she spoke, so her face was no longer in the light. "I'm tired, I guess." She searched for words to put into the silence. "I'm so tired I almost forgot to tell you we're all on night shift."

That was good enough news to change the subject and take her friends' attention from her. It was even good enough news to cheer her.

Later they returned to the hiding place in the forest and slept, lying close with Gryf in the middle. In the distance the sky flashed bright, then darkened. Only a faint mutter reached them, but the lightning revealed heavy clouds and the wind carried the sound closer. Kylis touched Gryf gently, taking comfort in his deep and regular breathing. Lightning scarred the sky again, and seconds later thunder rumbled softly. The wind rustled dry fronds.

Gryf stroked Kylis' tattooed shoulder. He touched her hand and their fingers intertwined.

"I wish you could get out," she whispered. "I wish you would." The lightning flashed again, vivid and close, its thunder simultaneous. Jason started in his sleep. During the brief flare Gryf looked at Kylis, frowning.

It began to rain.

In the morning Kylis woke by reflex, despite the absence of the siren. The whole day was free, but she and her friends had to rest, for the night shift was first on duty. Gryf was already sitting up. He smiled in his it's-all-right way.

"Let's see," Kylis said.

He turned. The welts were silver-gray down their lengths, even where they crossed. They were uninfected and the ends had begun to heal. Gryf stretched his arms and looked over his shoulder. Kylis watched his face, the fine lines at the corners of his eyes, but he did not flinch. Biocontrol was one thing Kylis had proper training in, and she knew Gryf could not stretch human limits indefinitely. This time, though, he had succeeded.

"How much better are you?" she asked.

He grinned and Kylis laughed in spite of herself. She forced away the thought and worry of the Lizard. Together she and Gryf woke Jason.

But all the rest of the day her apprehension grew. She was certain the Lizard would not accept her refusal easily. Now Kylis had to look twice at the little movements in her peripheral vision, once to make sure they were not hallucinations and again to make sure they were not the Lizard. By evening she was taut with acting out a pose of normality and maintaining an artificial calm, and she was affecting Jason and Gryf with her agitation. She would not speak of the reason. She could be nearly as stubborn as Gryf.

Kylis was almost relieved when the siren shrieked and they had to return to the installation to gather their rations and the set's allowance of medicinal soap. She had tried being angry, and sullen, and heedless, but under it all she was frightened.

They walked past the guard stations, across the lengthening shadows of afternoon. At the top of the Pit they stopped, looking down. But they could not delay; they descended. The heat from the unworked day pooled in the center of Screwtop. The sides of the Pit reflected heat; the metal of the machinery radiated it. The effects of temperature and noise combined synergistically.

Kylis and Gryf and Jason were all assigned to the probe crew. Across the Pit, Kylis saw the Lizard watching her with no expression at all. She looked away. Miria was on this shift, too, but Kylis did not see her.

They dragged out the new drill bit and raised it; it hung suspended above the shaft, taller than a person, narrow and dangerous. It frequently seemed to recognize the absurdity of its domestication by weak human beings, and rebelled. At Screwtop it was all too easy to ascribe personality and malevolent intentions to inanimate objects.

Shaft sections lay in racks like giant petals around the stem of the drill, fanning out in rays opposite the bubble-covered works of the first two generators. The hum of turbines spread across the floor of the Pit, through boot-soles, reaching flesh and blood and bone. To Kylis, the vibration seemed to be the anger of the wounded earth, unwillingly giving up the secrets and the energy of its interior, helpless in its resentment.

When this shaft was finished, the temperature at its bottom would approach 800 degrees C. When the crew broke through the caprock and released the pressure, that temperature was enough to turn the water below into superheated steam. It was enough to drive another generator. It was enough, if they did not seal the caprock properly, to kill them all instantly. They would seal it, tap it, and build an air-conditioned bubble over it. Then engineers, heavily protected, would move in and build the machinery. The prisoners, who were not trusted anywhere near the generators, would move farther on to drill another well.

This was a clean way of generating power, and cheap in all but human terms. The wells eventually ran dry and power needs for North Continent grew greater. Redsun had no fossil fuel, few radioactive elements, too many clouds to use the energy of its dim star.

Gryfs job was to guide the shaft sections to the drill. Some concession was made to his value; he was not put on the most dangerous jobs. The command to begin was given, and the small contrived delays and grumblings ceased.

The work turned the prisoners almost into automata. It was monotonous, but not monotonous enough. Complete boredom would have allowed daydreams, but danger hung too close for fantasies. Sweat slid into Kylis' eyes when she was too busy to wipe it away. The world sparkled and stung around her. The night passed slowly. The Lizard watched from a distance, a shade like any other shadow. While he was near, Kylis felt alone and, somehow, obscenely naked.

At midnight the prisoners were allowed to stop for a few minutes to eat. Gryf eased himself down the control tower ladder. At the bottom, Kylis and Jason waited for him. They sat together to eat and swallow salt tablets. The break gave them time to rest against the morning.

Kylis sat on the ground, her back against metal, half asleep, waiting for the bell. The floor of the pit was wet and muddy and littered with broken rock and ash, so she did not lie down. The Lizard had kept his distance all evening. Kylis thought he was unlikely to do anything direct while she was among so many people, though they could do nothing against him.

"Get up."

She started, frightened out of a light doze by the Lizard's voice. He and his people had their backs to her; they moved between her and Gryf and encircled him. He rose, emerging from the shadows like a tortoiseshell cat.

The Lizard looked at him, then at Kylis. "Take him," he said to his people.

"What are you going to do?" Hearing the note of panic in her own voice, Kylis clenched her fists.

"The tetras want him back. They need him. They're getting impatient."

"You're sending him home?" Kylis asked in disbelief. "Of course," the Lizard said. He looked away from Kylis, at Gryf. "As soon as he's had enough of the deprivation box."

Beside Gryf, Jason stood up. Gryf put his hand on Jason's arm. The Lizard's people were moving nearer, closing in, should the Lizard need aid. A few of the prisoners came closer to see what was happening. Miria was among them. Kylis watched her from shadows, unseen. As the guards led Gryf away, Miria half smiled. Kylis wanted to scream with rage.