Tiaan recalled something Vithis had said just after coming through the gate to Santhenar. Tirior had wanted the amplimet but he'd been afraid of it, saying that it was corrupt and dangerous. Could she play on that fear?

'I can't bear to be without the amplimet; she said softly. 'I haven't suffered withdrawal since the gate was opened, but whenever someone else has my crystal, I feel the most indescribable longing for it.' She looked Vithis in the eye. 'Yet it frightens me. After Tirthrax, it was as if the amplimet wanted something. As if it were using me.'

The man who had come to the door was back, gesturing furiously. Vithis waved him away.

'Using you? How do you mean?'

'I felt that it was a million years old,' she said breathlessly. And all that time it had lain underground, drawing power from the node. Waiting, and planning what it would do when it got free.'

'What does it want to do?' Vithis spoke as if humouring her, but he was plucking uneasily at his chin.

Perhaps he was superstitious about such things. 'It's following a mineral. . , instinct, from times so long ago that the shape of the land was different. I dreamed that it was controlling me, though it didn't want me. It's looking for someone stronger, a great mancer like you! She reached out to him.

He sprang backwards. 'Don't touch me! It's telling you to work on me now, isn't it?' His breath whistled in and out through his teeth.

How could it be telling me anything?' she said with childlike innocence, 'I don't have it.'

Wait here, if you please.’

How could she do otherwise? Again Tiaan reached towards him but he stepped back smartly and slipped out through the flap.

He returned some time later with a woman Tiaan had not met before. She was old, her dark skin weathered to the texture of bark, her hair as grey as aged thatch and her back bent.

"This little thing?' the old woman said, fixing Tiaan with cloudy eyes. She came up close but avoided touching her. Her voice was croaky, crackly. 'It hardly seems possible.'

'We've all seen her fly the construct, Urien, and we know she made the gate.'

Urien stared right into Tiaan's eyes. 'The crystal talks to you, child?'

Tiaan shivered and the old woman smiled to see it. Her gums had withered, exposing snaggly yellow teeth which looked as though they'd been stuck in clay by an inexpert hand.

After I've used the amplimet,' said Tiaan, pretending awe, 'it whispers in my mind, the same way it talks to the node.'

'What!' cried Vithis and the old woman together.

'That was the reason Malien sent me away in the thapter —’

'Thapter?' scowled Urien.

'My flying construct,' said Tiaan. 'Malien had to send the amplimet away, even though she wanted the thapter for herself, because the amplimet was talking to the node. And then the Well of Echoes, trapped inside Tirthrax, began to thaw.'

Vithis's dark face went grey. 'Thaw?' he whispered, staring at her in dismay and a growing horror. Urien was more controlled, but for a moment Tiaan saw fear in her eyes and wondered just what it was that old Joeyn had given her with his dying breath.

'Malien was terrified that the Well would break free,' said Tiaan, 'and with the amplimet there she couldn't hold the Well in place. Had she not sent the crystal away, the whole great mountain and city of Tirthrax might have been destroyed.'

The Aachim withdrew to the far side of the tent in agitation, then went outside and she heard no more. They were gone for ages. When they finally returned, Vithis looked sick.

'How was the amplimet talking to the node, child?' said the old woman.

'The tiny light in the centre blinked on and off, too quickly to count,' Tiaan replied truthfully. 'But as soon as I, or Malien, took the crystal out of its pouch the blinking stopped, as if to hide what it was doing.'

'What else can you tell us about it?'

'After I left Tirthrax, it wouldn't let me go where I wanted.'

Urien pounced. 'But you did get away.'

It was a dangerous moment; Tiaan didn't want them thinking too hard about the secret of flight. 'I took out the amplimet, put an ordinary hedron in its place and hovered away until I was beyond the influence of the node.'

'What else did the crystal do?' said the old woman.

After fleeing your camp — where you shot at me without provocation! — I tried to take the thapter to Lybing, in Borgistry.'

'Why?' said Urien, ignoring the outburst.

'To do my duty and give it to the scrutators, but the amplimet wouldn't let me go that way. It took the thapter towards another powerful node, at Booreah Ngurle, but when we reached the mountain, and I turned for Nyriandiol, it wouldn't let me go there either. I was so furious that I resolved to smash the amplimet —’

'What happened then?' Vithis rushed out, and Tiaan was sure that he believed her.

'It cut off the field and the thapter fell into the forest. That's how my back was broken.' She didn't plan to mention that the lyrinx had repaired it.

'Do you have anything else to confess?' said Urien.

Tiaan did not like the implication, but explained about her time at Nyriandiol and Snizort, and how the amplimet had communicating with the nodes there as well.

The ancient lore mentions such a thing,' Urien said quietly io Vithis. 'It may be at the heart of the mystery of the last amplimet we used — and the catastrophe it caused:

After the death of a clan, followed by aeons of cover-ups,' said Vithis, 'how can anyone tell?"

'You say the amplimet talks to you,' said Urien suddenly. 'What does it sound like?'

'What?' said Tiaan, who hadn't thought of that.

'You said it whispered to you!' Urien snapped.

'It sounds .., a bit like you, but much older. It's a rustly, scratchy sound: Tiaan made a hissing crackle. 'A bit like that. I can't do it very well.'

'What does the crystal tell you, Tiaan?'

Tiaan was ready for that question, for she'd spent the last two hours thinking of the answer. 'The node-master is coming. I must protect the amplimet for the node-master.’

'What node-master?' said Vithis, with a trace of eagerness.

'It didn't say. But…'

'Yes?' Urien and Vithis spoke together.

'I don't think he, or it, comes from this world.'

Vithis visibly steeled himself, then withdrew the platinum-wrapped amplimet from a metal case and exposed it to view. 'Let's see if it wants to talk to you now, Tiaan:

Tut it away,' cried Urien, shuddering. 'How dare you bring it here after what it's just done.'

'Do you think I want to?' he snapped. 'I've always counselled against it. But Urien, our supplies are nearly exhausted and without constructs we're helpless. Should the enemy return in force, they could finish us in a single day. The amplimet terrifies me, but it's our only way out. Take it, Tiaan.'

Tiaan could sense Ghaenis's death in it. 'I'm afraid: She reached for the crystal, but stopped short of it. 'Everything seems so clear when it's talking to me, so perfect, but afterwards it fades like a dream.' Giving a little shiver of yearning. Tiaan put her memories of withdrawal into it, to make the action seem more real. 'All I want is to listen to it again.' She unfocussed her eyes, staring raptly at the wall of the tent.

Tirior slapped the tent flap out of the way and hurled herself in. Ghaenis's death had leached her chill beauty away, leaving her puffy faced, red eyed and aged by twenty years. Seeing the amplimet on Vithis's outstretched hand, a cold rage seized her. 'Have you learned nothing from my son's death?' she said furiously.

'Can you find us a way out of here?' said Vithis, taking a step away from her fury. He folded the platinum over the crystal but did not put it away.

Tirior's eyes followed it. 'There's no way out for Ghaenis!'