'My brain is burning.' Unfastening her belt, she slid off the chair onto the metal floor.

Thyzzea and one of the soldiers carried Tiaan out, laying her on the brittle grass. A healer was brought, then Urien appeared and laid her hands on Tiaan's head.

'No harm has been done,' said Urien, 'hut you must take better care of her, Vithis.'

'We've moved only a hundred and forty constructs,' said Vithis. 'At this rate it'll take six weeks.'

'That's a hundred and forty more than was thought possible yesterday, and if you work her to death you'll get no more.'

'In two weeks our supplies will run out, Urien!'

'Surely you understand the risk you're taking?'

All right!' he said. 'But there's got to be a way.'

Tiaan lay in a daze, watching as Vithis held a heated conference with Urien, Tirior, and other Aachim she did not know.

A buzzing started in her ears, and hot flushes began to radiate out from the centre of her head. Tiaan heard sounds like speech but could no longer make out the words. She turned over, shielding her face from the sun.

Thyzzea helped Tiaan to a seat in the shade and the symptoms gradually faded. She was sitting there, sipping at a cool drink, when Vithis and Urien approached.

'How are you feeling?' said Urien.

Tiaan told her. 'You're killing me.'

'We've got to move the constructs faster,' said Vithis. 'Should the lyrinx come back we'll be defenceless.' 'We've faced this problem before,' said Urien. "There may be a way. Your sickness is not from the amount of power you're drawing, Tiaan, but the source!

'I don't understand; said Tiaan.

'You're taking all that power from one small field and the draw is too concentrated; that's why it's damaging you. But if you were to draw from a number of fields at once, spreading the load evenly, you could take as much, or even more, without harm.'

'I've tried it before. As soon as I turn to the new field, I lose track of the old.'

Urien rose, drawing Vithis out of earshot. They had another long, heated argument before heading their separate ways.

'What was that about?' Tiaan asked Thyzzea after they had gone.

'It has to do with forbidden knowledge, and the danger of giving it to you.'

'What forbidden knowledge?'

'I don't know.'

'Suppose that it works,' said Tiaan, 'and the constructs are saved. What then?'

'Better to ask my father that,' said Thyzzea, looking worried. 'But. . .'

'Yes?'

'How could they ever let you go?'

Twenty-one.

Ullii had gone, fleeing into the night. Nish began to run after her but Flydd took hold of his collar. 'You'll only make it worse, if that's possible. She'll come back when she has to - I hope!

'I have to explain,' Nish said desperately. 'I've got to tell her I'm sorry. It was an accident, surr. She'll think I don't care.'

'You'll never find her,' said Flydd. 'No one is better at hiding than Ullii.'

'What if she doesn't come back? What about my child?'

'You'd better pray she does, for all our sakes. And that when she does, you know what to say to her.'

What could he say? I'm sorry I killed your long-lost brother, Ullii. I didn't mean to. It was pointless.

They searched the clearing, using Flydd's ghost light. Both of his opponents were dead, as was the soldier by the air-floater. The one Nish had wounded in the leg had fled, leaving only a few specks of blood on the leaf litter. There were three more bodies in the wrecked air-floater, two soldiers and the pilot, a young woman who looked unharmed but was already growing cold. She had a broken neck.

Nish stood by her, his guts crawling with horror. She had been younger than he was. The young soldier, too. 'How could everything have gone so wrong?' he said softly. 'I tried so hard.'

'I told you I wanted to capture the air-floater,' said Flydd, glaring at Nish like an executioner choosing his next victim.

'I didn't hear your orders, surr. I was coming across to ask you what you'd said-'

'Couldn't you have thought before you threw your cudgel?'

'There was no time. The air-floater was coming down fast, surr, and I knew we couldn't deal with that many soldiers. If they'd landed, they'd have had us. I reacted instinctively.'

Surely it was obvious that I planned to escape in it?'

'No surr, it wasn't. I'm sorry.'

I was going to rendezvous with Irisis and Fyn-Mah, then stop your wretched father before he attacks the lyrinx and destroys another army. Now its fate is out of my hands. All I can do is run like the whipped cur I am.'

Nish hung his head. What a miserable, useless worm he was. He wanted to crawl under a rock and die. The wound in his side was painful but had stopped bleeding, so, not wanting to draw any more attention to himself, he didn't mention it.

'Why so few in the air-floater?' said Flydd to himself.

'Perhaps the others got out on the other side of the forest.'

Flydd took no notice. 'Who was directing them? This search must have been led by a querist, at the very least, but there's no sign of one. Unless this seeker was doing it, shielded from us and under their control.'

Nish was sure he knew what Flydd was thinking: that he, Nish, was the most worthless fool who had ever drawn breath. That his father had been right - he was a walking disaster.

'I'll keep going north,' said Flydd. 'Not that I can do anything there, except sweat blood about the war. At least with Mylii dead they won't be able to track me.'

'Do you want me to come too?' Nish asked in a low voice. The way Flydd was talking, Nish was afraid of being left behind.

'Want?' said Flydd. 'Of course I don't want you - though I suppose I've got to have you.' He gave Nish a furious glare, then relented. 'Come on, lad, put it behind you. You clearly didn't know I planned to take the air-floater, and maybe you were right. Six soldiers probably were beyond me. In other circumstances you'd be a hero.'

'But I killed Mylii, surr.'

'A tragic accident that could have happened to anyone. Besides, he reared back onto the knife after you told him to hold still, so you can hardly be blamed for it.'

'I thought he was attacking Ullii' said Nish. 'I was trying to save her, and now he's dead - an innocent man.'

'You were doing your best, so let's say no more, eh? Besides, it remains to be seen whether he was innocent.'

'What do you mean?'

'Was he embracing his sister, or holding her for the soldiers? Did he put his arms around her because he loved her, or because Ghorr ordered him to find her? But enough of this speculation - fit yourself out and gather what food you can, and make it snappy.'

They replaced their rags with clothes from the victims, the least bloodstained garments they could find. Nish's were too big, but he found a pair of boots that were roughly his size, and a hat. In ten minutes they were ready. Pilfered packs contained spare clothing, food for a couple of weeks, water bottles and all the other gear that soldiers carried. Nish had a shiny new sword, unused by the look of it. Flydd had taken the hedron from the air-floater's controller, as well as the chart-maker's spyglass, which had survived the crash.

'Not sure what use this will be,' he said, tossing the crystal in his hand. 'But you never know. Let's go. This place will be swarming with scrutators in a few hours.'

Are we going to the rendezvous?'

'There's no point. By the time we walked all that way, Irisis would be long gone. You can't hide an air-floater in country like this.'

'Where are we going?'

'Into the wilderness.' Flydd smiled grimly, as if at some private joke.

'What about Ullii?' Nish's voice squeaked. 'We can't leave her.'

'There's no way of knowing where she is. If she wants to find us she will, though that's hardly likely now.'

He said it without rancour, but Nish cringed.

It was another sweltering day. They walked all that morning, taking advantage of the cover along creeks, mostly dry, and ridges, whenever they ran in the right direction, which was not often. They saw no sign of Ullii.

In the afternoon, Nish began to flag. The wound in his ribs grew increasingly painful but he could not stop to attend to it. He was continually falling behind and Flydd kept yelling at him to keep up. The scrutator had not mentioned Mylii's death again but Nish ached with guilt.

Flydd seemed to be making for a hill knobbed with round red boulders, one of many in this endless landscape of undulating plains and gentle mounded hills. Nish up-ended his water bottle but the few drops it contained barely wet his tongue. They had crossed half a dozen watercourses in the afternoon, all dry. He sat on a rock, staring at the ground. It was hard to find the will to go on. Every moment of the day he'd regretted his follies; he'd looked everywhere for Ullii but she was gone and his child with her. Why couldn't he have thought before he brought down the air-floater, or held the knife to Mylii's back? Why hadn't he realised Ullii was pregnant? Why, why, why?

The scrutator appeared. 'What's the matter? We can't stop out in the open.'

Nish struggled to his feet. Pain spread from the wound up into his shoulder, and down his hip to the outside of his leg. His feet hurt, too, for the boots were too small and had already rubbed the skin off his toes and heels.

He fell several times on the way up the hill, which was steeper than it had appeared. Flydd, well ahead, did not notice. The next time Nish looked up, the old man had vanished.

Nish slipped on rubble. As he picked himself up, he spied another air-floater on the horizon. They couldn't see him from so far away, but he lay still until it drifted out of sight to the south. He had to crawl the rest of the way up the hill - his feet hurt too much to walk.

He eased between two boulders and saw Flydd sitting in the shade, eating another of those knobbly fruits, licking the skin with the gusto of a child with a piece of honeycomb. The green pulp had oozed all down his front and he hadn't noticed. I just saw an air-floater; Nish croaked.

'It's been there a while. We should be safe from it, unless they've picked Ullii up to track me.'

The cold was spreading across Nish's chest now, but his forehead was dripping with perspiration.

'Is something the matter?' said Flydd..

Nish managed a limp wave with one hand. 'S'orright,' he slurred, holding his side. 'Just a flesh wound.'

'Where?' Flydd unfastened his shirt. 'How did you get this?'

'Soldier in the forest. Stuck me in the ribs. Not serious.' Nish tried to lie down.

Now Flydd was furious. 'I'll be the judge of that. You're a fool, Nish. Why didn't you tell me?'

Nish groaned as the scrutator probed the wound with fingers that seemed deliberately rough.

'This should have been treated last night. Now it's infected. You need a swift boot up the arse!' Flydd proceeded to give Nish one, knocking him down on his face. He leapt up with the empty water bottles and disappeared.

Nish closed his eyes. He deserved no less.

It was dark by the time the scrutator returned. Nish woke from a feverish sleep to find Flydd looming over him.

I didn't want to risk a fire,' he said, the anger gone, 'but we've got to have hot water. That wound must be cleaned out.'

'I didn't think it was that bad,' said Nish, who felt cold all over. 'It didn't bleed much.'

'You've been lucky, but if the infection sets in you'll die of it. And that might not be such a bad thing,' Flydd said cheerfully. 'At least you won't be able to cock up anything else.' At the look on Nish's face, he added, 'I'm joking.'

The scrutator kindled a small fire well under the overhang of a boulder and climbed up to check that it could not be seen from above. 'This'll have to do. I'd have to be really unlucky for that to be spotted. But lately, I have been really unlucky.'

When the water was boiling, Flydd cleaned the wound with rags soaked in scalding water, before making a poultice of herbs beaten into the pulp of one of the knobbly fruits and binding it over the gash. Subsequently he stewed meat and vegetables for dinner.

Though famished, Nish was unable to take more than a few spoonfuls. The scrutator ate the rest, pulled his coat around him and closed his eyes. Nish did too, and slept, until his dreams forced him to wake.

Seven people had died last night and he was responsible for five of them. He hadn't meant to kill anybody, but they were dead nonetheless. It was not an attractive thought. The soldiers might have killed him without a qualm, but he could not feel the same way about their deaths. Mylii had been harmless. Worse still, the pilot of the air-floater had been a female, as most pilots were. He had killed a woman. In a world where the falling population was a disaster, to kill a woman of child-bearing age was the worst crime in the register. He let out a small, squeaking choke.

Flydd rolled over in his coat. 'What is it now?'

'I killed the pilot. A woman. What am I to do, Scrutator?'

'Find a way to atone for it. And you can start by not disturbing my sleep.' Flydd rolled back the other way, snapping the collar about his ears.

Nish kept seeing her face - she had been a pretty little thing. It became a night of horrors. Each time he dozed off he dreamed about the dead, but now all were women with babies in their bellies - his children. Each time, the dreams jerked him awake. Nish stared into the night but their faces were painted on the darkness. And Mylii. For all that it had been an accident, he had killed Ullii's brother and nothing could undo that. It must destroy everything that had ever been between him and Ullii. If only she would come back and he could, at least, explain.

Flydd's poultice proved efficacious, for Nish's wound was better in the morning. It was just as well, as Flydd's left thigh, the one torn open and burned by his first crystal, had become infected. Nish spent the best pan of an hour cleaning and dressing it in the foggy dawn, with the scrutator stoically enduring the pain.

There was no sign of Ullii. They continued north and west in silence. It was like being a slave all over again, only that Nish was pushing himself to the limit of his endurance. He'd hoped that exhausting mind and body might keep the nightmares at bay, but even in his most agonising moments, when the blisters on his feet had burst and he drove himself on raw, weeping flesh, the dead faces were there.