The Magma City never slept, its industry continuing through every hour of the day and night. Despite the crowds of robed adepts, menials and workers that filled its streets, Dalia still felt acutely vulnerable. Their small group was clothed in nondescript robes, a mix of reds and browns that marked them as low-grade forge workers. A common sight on the thoroughfares of Adept Zeth's forge, yet each of them felt as though every eye was upon them.

The constant thrum and low vibration that permeated every surface of the city was more pronounced on the streets, and Dalia wondered if they were being watched even now. Throne knew how many different ways there were of monitoring a person's whereabouts, biometric readings, facial recognition, genetic markers, spy-skulls or even good old-fashioned eyes.

'Lift your head up, girl,' said Zouche. 'You look like you're up to no good with your head down like that.'

'We are up to no good,' pointed out Severine. 'We're leaving the forge without permission. I said this was a bad idea.'

'You didn't have to come,' shot back Caxton.

Severine shot him a withering glance and said, 'I needed to come,' as though that should settle the matter. Dalia listened to them bicker, recognising the fear behind it. She understood that fear, for each of them was a member of the Cult Mechanicum, augmented in ways both subtle and gross, and each stood to lose a great deal should they be discovered.

'We have to do this,' said Dalia. 'Whatever we unlocked with the Akashic reader, it's hidden in the Noctis Labyrinthus. We have to find out what it is.'

'You mean you have to find out what it is,' said Zouche. 'I'm quite happy not knowing.'

'Then why are you here?'

'You said you needed my help,' said the short machinist, and Dalia could have kissed him.

She took a breath and lifted her head. 'Zouche is right. We shouldn't look as though we've anything to hide. I mean, look around us, the place is as busy now as it is any other time of the day.'

Blue-tinted lumen globes sputtered and fizzed atop black poles, their glass reflecting the golden-orange glow from the clouds. Soaring above them, higher even than the silver pyramid of Zeth's forge, was the dark, mountainous shadow of Arsia Mons. The volcano's side had been quarried away five hundred years ago and replaced with the gargantuan structure of Aetna's Dam, its monstrous, cyclopean scale almost impossible to comprehend.

Dalia recognised the name it bore, which had belonged to a legendary fire goddess of a long dead volcano that rose from the Mediterranean dust bowl of Terra. It was fitting that the name should be appropriated for a rekindled volcano on Mars.

As it had been when Dalia had first arrived on Mars, the Magma City thrived and pulsed with activity, with its inhabitants making their way to and fro on foot and by any number of bizarre mechanical conveyances. Servo-skulls of gold, silver and bone darted through the air, each on an errand for its master, and Dalia wondered which of them served Adept Zeth.

'It may be busy,' said Caxton, 'but if any of the Protectors realise we shouldn't be on shift, we'll be in real trouble.'

'Then best we don't attract their attention by standing around yapping like stray dogs, eh?' said Zouche. 'Come on, the mag-lev transit hub is just ahead.'

They followed Zouche, trying to affect an air of nonchalance and give the impression that they had every reason to be there, though Dalia suspected they weren't succeeding too well. She could feel sweat running between her shoulder blades and fought the urge to scratch an itch on the back of her leg.

She felt great affection for her friends, knowing that she wouldn't have had the strength or courage to make the journey on her own. She had told them she needed them, which was true, but not for the reasons any of them might expect. Their technical skills would no doubt be useful along the way, but she needed them with her so the dark and terrifyingly lonely void that lurked behind her eyes every time she closed them wouldn't overwhelm her.

She knew Caxton was with her because he was in love with her, and Zouche had come because he was about as honest as a person could be. He had said he would come and he had. He lived his life by doing as he said he would do, which even Dalia knew was all too rare a trait in humanity.

Dalia didn't know why Severine had come, since the girl clearly didn't want to be there and was terrified of losing her status as a Mechanicum draughter. Guilt was what Dalia suspected drove Severine to make this journey, guilt for what they had allowed to happen to Jonas Milus. It was a reason Dalia was uncomfortably aware played no small part in her own determination to discover what lay beneath the Noctis Labyrinthus.

Only Mellicin had not come with them, and Dalia was sad not to have her logical presence with them right now, though that was, she supposed, exactly why she wasn't there. Caxton had gathered them all in Zouche's hab, a sterile and functional chamber that reflected the machinist's austere, no-nonsense character. The only concession to decoration was a small silver effigy of a lighthouse that sat in a corner with a slow-burning candle smouldering before it.

All of them had answered Caxton's summons: Severine looking rumpled and irritable, Zouche as though he had been awake all along and had simply been waiting for them, while Mellicin looked as calm as Dalia could ever remember seeing her.

With everyone gathered, Dalia had outlined the substance and unnatural regularity of her dreams, the imagery and the feeling that she was being summoned to the Labyrinth of Night.

'Summoned by what?' asked Zouche.

'I don't know,' admitted Dalia. 'This… Dragon, whatever it is.'

'Don't you remember the stories?' asked Severine. 'The dragons ate fair maidens.'

'Then you and Mellicin will be all right,' quipped Caxton, wishing he hadn't when Dalia stared at him in annoyance.

'I had the dream again tonight,' said Dalia. 'The same as before, but it felt stronger, more urgent. I think it's telling me that it's time to go.'

'Now?' asked Severine. 'It's the middle of the night.'

'Kind of appropriate then, eh?' said Zouche. 'We are going to the Labyrinth of Night after all.'

They all looked at each other then, and Dalia could sense their hesitation.

'I need your help. I can't do this alone,' she said, hating the pleading note in her voice.

'No need to ask twice, Dalia,' said Zouche, picking up the silver lighthouse figurine and tucking it into his robes. 'I'll come.'

'And me,' said Severine, though she didn't make eye contact.

'Mellicin?' asked Caxton. 'What about you? You in?'

The stern matronly woman who had held them together and made them work better in a team than they ever could have managed alone, shook her head. She gripped Dalia's hand and said, 'I can't go with you, Dalia, I have to stay. Someone has to finish what we've begun here. Believe me, I'd like nothing more than to go with you, but I'm too old and too set in my ways to go gallivanting around Mars chasing dreams and visions and mysteries. My place is here in the forge. I'm sorry.'

Dalia was disappointed, but she nodded. 'I understand, Mel. And don't worry about us. We'll be back soon, I promise.'

'I know you will. And don't call me Mel ever again,' said Mellicin.

They laughed and said their goodbyes before making their way towards a journey into the unknown and an uncertain future.

So lost was Dalia in her memory of saying goodbye to Mellicin that she bumped into a passing adept, who stared at her with amber eyes from behind a silver mask. He blurted a hash of irritated binary and Dalia shrank from the force of his utterance.

'Many apologies, Adept Lascu,' she said, reading his identity in the noospheric information swirling above him before remembering that she shouldn't be able to read such things without modification.