'A pair?' said Flydd. 'Are you afraid?'

'No,' said Ullii. 'They're empty now.'

Flydd's feet left pale trails in the dewy grass. Nish followed in silence, unable to make sense of it. Why was Flydd squandering their lead for the exploded remains of a node?

Shortly they began to encounter patches of burnt grass, each containing slaggy aggregations of melted rock which must have been blown out of the hole. The patches coalesced, the blobs of slag grew larger until the ground was knee-deep in them. The bigger ones were still hot enough to warm Nish's ankles as he wove between them.

The hole formed a perfect oval about forty spans wide by sixty long. Its rim was as sharp as cheese cut with a knife and crusted with exhalations of red, yellow and brown sulphur. Within, the land had subsided in a series of concentric oval rings, like a squashed spyglass. The outside ring, the highest, bore a hide of withered grass. On the next, the grass had been carbonised in place. The soil of the remaining rings was burnt bare. The centre of the hole was obscured by rising steam.

There were nine of these oval rings, each about the width of a span, the drop to the next being roughly the same distance. They formed a series of giant steps down to the centre, though the shimmering air obscured what lay below. The humidity was choking.

'You're not planning to go down there?' said Nish, eyeing the hole anxiously.

Flydd chuckled mirthlessly. 'Indeed we are.'

He lowered himself onto the first ring and held his arms up. Without hesitation Ullii slipped into them. Flydd could get her to do things that no one else could. The pair turned their backs and went to the edge.

Nish was reluctant to follow but Flydd was not a man for excuses. Going backwards over the first edge, he felt his chest tighten, his pulse quicken.

Flydd and Ullii were well below him as Nish climbed down to the next level. The sides of the oval rings, as smooth as polished stone, resembled a series of pistons one inside the other. At the ninth ring it was stifling, steamy. Waves of heat pulsed up from an oval trench five or six spans deep and, when the steam clouds parted, its base glowed red. Within the trench, a cylinder of rock rose from the centre, listing to one side. The once-smooth stone walls had run like toffee.

On its flat top, like a pair of teardrops on a pedestal, sat two shining globes of liquid metal, bright as quicksilver. They were shaped like drops of water, though each was the size of a soup bowl. A faint humming sound came from them. Ullii had taken her mask off and was staring at the globes as if entranced.

'My, oh my,' said Flydd. 'Can you hear the song of the tears?'

'What are they?' Nish sat near the edge, not too close, praying that Flydd was not going to go after them.

'The distilled tears of the node,' said Flydd.

'I don't understand.'

'No power is ever completely destroyed, Nish. There's always some residuum - and it's ever more complex, warped and strange. I wonder . . . Can this be an accident, or were they created?'

'Flydd?'

'According to myth, or rumour, the tears are the essence of the node, purified of all base elements by the blast that destroys it. They're believed to be made of the purest substance in the world, and desired by mancers more than any other. But no mancer has ever obtained so much as a speck of that matter, much less a complete tear. They represent the value of a continent.' Flydd gazed at the tears with greedy eyes.

'And you want them?' said Nish. 'Are they magic?'

'Empty,' Ullii interjected.

'Not at the moment,' said the scrutator. 'But their substance, which has been called nihilium, takes the print of the Art more readily than any other form of matter, and binds it much more tightly. Oh, I want them - to make sure no one else can have them.'

'How are you going to get across?'

Flydd gauged the distances. The oval trench was red hot, making it impossible to climb down and up the other side. The stone pedestal seemed cooler, though it still radiated such heat that they could not have gone within a couple of spans of it, even could they have reached that far. Besides, it was well out of reach, its top being three spans below them, and eight or nine out from where they stood.

'Even if we had a rope or a grappling iron we couldn't collect them,' Flydd muttered.

'And I dare say they're heavy?'

Flydd thought for a moment. 'If they have weight as we know it, they would be heavier than lead; they could have the weight of gold, or even platinum. But then again, they may weigh virtually nothing . . . Let's go up.' Flydd gave the tears one last, lingering look, then turned to the wall.

Nish boosted him up, then Ullii. Flydd reached down a hand to him.

'What are you going to do?' Nish wondered as they reached the top.

'I don't know. The time is all wrong.'

They repaired to the shade of a grove of trees some ten minutes' walk away. Flydd filled the overseer's pannikin from a tiny spring, kindled a smokeless fire under it with dry twigs, carefully washed his hands then lay back with his eyes closed.

'If the field is dead,' said Nish, 'how come you were able to make that blast back there, to save Ullii?' It had been preying on his mind ever since.

Flydd looked up irritably. 'Can you be quiet? I'm trying to think.'

Nish stared at the scrutator as if unable to make him out. Finally Flydd snapped. 'Damn and blast you, Nish! Go away.'

Nish rose abruptly but Flydd said, 'Oh, you might as well sit down. I've lost my train of thought anyway.' He peeled back his torn and bloody pants leg to reveal the jagged, blistered gash in his thigh. 'I had a charged crystal embedded in my leg a long time ago, for just such an emergency.'

'You had it all that time?' Nish exclaimed. 'Why didn't you use it to save yourself?'

'It was for emergencies.' snapped Flydd.

And being enslaved didn't count?' Nish found that incomprehensible.

'My life wasn't in danger, apart from being bored to death by you, I wanted to remain with the army for as long as possible, so I'd know what Jal-Nish was up to. You do know that yoar father plans to lead an attack on the lyrinx? An unbelievable folly that can only end one way.'.'

'I've heard the slaves gossiping about it,' said Nish. Now I'm out of contact, and that's bad.'

'What about the crystal in your leg?'

'Once used, it can't be reused.'

'Why didn't you sew two crystals into yourself? Or twenty, for that matter?'

Flydd sprang up, his face thunderous. 'Don't you ever think before opening your mouth? Nothing comes without a price, Artificer, and putting powerful crystals inside you exacts a hefty one. Discharging one -' He shook his head.

It was a nasty tear, the length of Nish's little finger and burned at the edges. 'That must be painful,' Nish observed.

'You use words the way a blacksmith cuts flowers! Scrutators are trained to overcome pain, and I've had more practice than most, but this hurts like bloody blazes.' Tearing off the sleeve of his shirt, Flydd ripped it into strips and poked them under the boiling water. After a minute or two he fished them out, waved them in the air to cool them, then bound them around the injury.

'That'll do.' Turning away from the pit, Flydd began to limp towards a hill some half a league to the east.

'Where are we going?' said Nish.

'We can't recover the tears on our own. I've got to find help.'

It took the best part of an hour to reach the hill, which was mounded like a breast and topped with a cliffed nipple of gullied grey stone. Flydd panted his way up, emerging on a patch of flat rock some thirty paces across, bisected by a cleft from which a solitary tree sprouted. They sat in its meagre shade while he got his breath back.

'You'll have noticed that this hill is quite distinctive,' said the scrutator. 'Irisis and Fyn-Mah were to rendezvous here with the air-floater, if they got out of Snizort alive.'

'What were they doing there?'

'None of your business.'

'Did you know you were going to be taken prisoner?'

'Ghorr needed a scapegoat and there was nothing I could do about it without -' He broke off, staring back towards the node. 'But of course, if Irisis and Fyn-Mah did escape, they would have been here days ago. Spread out. Look for a sign.'

It took the best part of an hour to find it, an ornamental dagger partly embedded in the ground, as if dropped from a height. Rudely scratched on the blade was: Yes, no, 3.

'What can that mean?' said Nish.

'It means Fyn-Mah found what she went into Snizort to find, that she was hunted and had to flee, and that she's gone to the third place I mentioned previously.'

'That being?'

'None of your business.'

Nish sighed. In this mood, Flydd was impossible to deal with. 'Then we have to walk,' he remarked gloomily. Despite its dangers, air-floating was the most pleasant of all means of travelling. 'Is it far away?'

The reply was pure Flydd. 'Further than the people hunting us.'

They were climbing down the cleft when something winked in the sun to the south. 'That's an air-floater!' hissed Nish. 'Could it be Irisis coming back for us?'

Flydd squinted at the object, which was moving low to the ground along a line of trees that marked the course of a creek. 'She wouldn't dare, in daylight.' The machine began to zigzag back and forth as if following something. 'What can they be doing?'

'Dogs!' whispered Ullii. She'd been so quiet since leaving the node crater that Nish had practically forgotten she was there.

'They've found our tracks,' said Flydd.

Nish hefted a knobbly stick. 'We'd better get ready to fight.'

'Stay down! We can't fight that many people.' A leathery tree grew horizontally out of the cleft before bending to, the vertical. Flydd pulled himself up into the curve and peered around the trunk. Nish crouched between two rocks splotched with bright yellow lichen.

The air-floater lifted and ran directly towards the node crater. Flydd groaned, the tortured sound two trees make when rubbed together in a storm. 'Let's pray no one recognises what's down there.'

The machine settled. Nine figures went into the pit: seven people and two dogs. The pilot and one other person could be seen moving about on the air-floater. Nish twisted his fingers, together. After some minutes it lifted, moved over the depression, bucking in the updraught, and drifted down.

'That's a dangerous manoeuvre,' said Flydd. 'If the walls of the gasbag touch something hot, they're dead.'

Time passed. They could see nothing but the top of the airbag. 'What are they doing?' said Nish.

'A really good pilot could bring it down right over the pedestal. Someone could simply pick up the tears.'

'They're taking a long time,' Nish said later.

'Be quiet!'

The air-floater crept out of the crater and hovered in the updraught, its bow pointing at their hiding place. 'Whoever it is,' said Flydd in a curiously flat voice, 'they have the tears.'

The air-floater lurched, turned away and began to drift, low to the ground, towards the army camp in the distance.

'We'd better make sure/ Flydd said.

They scrambled down the gully. 'I dare say the tears are more important than we are,' said Nish hopefully.

'They are, but the scrutators won't give us up, Nish.'

They could see the smoke well before they reached the hole. It was yellow-brown with threads of black, and smelled like burning hair and meat.

'I can't see anything.' Flydd was peering over the edge. 'I'll have to climb down.'

'Do you mind if I stay here?' said Nish. The stench was making him sick.

'Good idea. Keep watch. You too, Ullii. Ullii?'

She was hanging back, holding her noseplugs in. 'This is a terrible place,' she whispered.

'You don't have to come near.' Flydd eased his injured leg over the side.

Nish watched him go down. A surge of greasy brown fumes obscured Flydd as he reached the fourth oval. He bent double, coughing. Nish moved away from the edge. When he returned, after the smoke had thinned, Flydd was not to be seen.

'Is he all right?' he said to Ullii.

She gagged and doubled over, unable to speak. Nish circumnavigated the depression, seeking a better vantage point, but did not find one. After five or ten minutes, Flydd began to labour up again.

Nish helped him out onto the ground. The skin below Flydd's eyes had gone the purple of a day-old bruise and it took him quite a while to focus.

'Are the tears gone?' said Nish.

'Yes.'

'Who could it have been?'

'Ghorr is my guess, though it could have been any of the scrutators. Can you tell, Ullii?'

'No,' she whispered. 'Can't tell anything. Can't see anything.' In times of stress she sometimes lost her lattice.

'But whoever did take it,' said Flydd, 'they've made sure no one will ever know.'

'What do you mean?' said Nish.

'The trench at the bottom is clotted with bodies. Six soldiers and the air-floater's chart-maker. And the dogs. In an hour, the witnesses will be ash.'

All but us,' said Nish. 'And the pilot.'

'He needs her to get back to camp, but as soon as the air-floater lands, she's dead. He'll call it a seizure.'