'Yes.' Mary's throat was dry. She thought she knew what lay ahead.
'It is the greatest sacrifice… your life. A life for a life.' Although Mary had anticipated the Goddess's words, the enormity of what was being asked, once it had been put into words, stunned her. She was terrified, yet she knew she had no doubts. There was no alternative: Caitlin was good and decent and deserved her chance at happiness. To save her… that was an achievement worth dying for.
'I understand,' she said. 'A life for a life. I accept.'
'You are brave, little sister.' The Goddess raised her arms in a gesture that showed her appreciation of what Mary had overcome to make her decision. She smiled. 'What lies ahead is the greatest mystery of all. But know this: death is not the end. Do not be scared, for Existence always cares for its own. Though you leave behind everything you understand, your sacrifice is recognised. Take with you the knowledge that you have committed an act of great importance and great goodness.'
The moonlight became brighter, and briefly Mary thought she was in a verdant grove on a hilltop somewhere in the deepest country. 'Know also, sister, that you have touched my heart. To travel here along the hard road, to overcome the three tests, to give up your life for another… you are all I could have hoped for in your kind. You, little sister — you alone — have turned me around.'
'You're going back?'
'A new age awaits, and I shall be there to guide your people through the light of the moon. I will be there, in the forests and by the rivers, on the mountaintops and by the cool lakes. There is a struggle ahead, but if there are more sisters like you, then we have hope.'
'I'm so pleased.' Mary's words didn't begin to capture the magnitude of what she felt, but before she could say anything else, she sensed movement behind her. Standing in the steam was the Jigsaw Man, her nemesis.
'He is death, and when he touches you, you shall die,' the Goddess said. 'But there shall be no pain. You shall slide into the cool night… and then the moon shall rise.'
Mary took a deep breath and steeled herself, yet she was surprised to find she was no longer scared. Instead, she was excited at what was to come. She knelt down, for it seemed right, and then said, 'And Caitlin will be all right?'
'A life for a life, little sister,' the Goddess said. The steam swirled in a gale that blew from nowhere. Blue lightning crackled all around, and as the thunder rolled out, a knight in black armour emerged from the vicinity of the stream. He wore a helmet crafted like a boar's head.
'Who is he?' Mary asked.
The Goddess merely smiled enigmatically.
The steam shifted and behind it Mary could see the storm-lashed lane leading to Caitlin's house and Caitlin hiding behind a hedge, waiting. 'When is this?' Mary asked, though she thought she knew.
'The beginning,' the Goddess said. 'And now, another beginning.'
Mary felt a cool touch on the back of her neck and her eyes fell shut, though her smile remained. The warp field behind Caitlin came alive with crackling blue lightning, obscuring the vista across deep space. The bolts of coruscating energy sizzled like molten iron across the now-deserted chamber, the Lament-Brood long gone to who knew where. Liam danced away in shock, but Caitlin, already numb from the House of Pain's gradual transformation, only turned to stare.
From the depths of a wall of Blue Fire stepped the black knight, the fierce light transforming the boar's-head helmet into a wild beast with glittering eyes. He strode forcefully towards the throne.
'Caitlin.' His voice echoed behind the grim helmet. 'The time has come.' Caitlin blinked once, twice, taking in what she was seeing with the languorous abandon of someone freezing to death. Yet the knight's appearance provided a brief spark that warmed her spirit.
'You can't give in, Caitlin.' His voice was clearer now than it ever had been, as if with each appearance he gained a little bit more of the person he had been.
'You've been with me right from the beginning,' Caitlin said. 'Why do you keep coming to me?' Curiosity brought more warmth. She shook her head, trying to remove the cotton-wool swathing her mind.
'You will have to wait a while for that answer. Just accept that someone has your best interests at heart. Now come with me.' He held out a gauntleted hand.
Caitlin hesitated, then took it. Blue sparks crackled into the tips of her fingers, reminding her of some of the exhilaration she had felt as she grew into her role as a Sister of Dragons. Suddenly she missed it acutely, felt almost bereft, and another part of the iciness burned away. 'Why can't you leave me alone?' she said dismally. 'I've had enough of all this. I'm so tired. I just want…'
'What? To die? To give up everything… all life? That's not you, Caitlin. I heard you were a doctor once, caring for the sick and the dying. Caring for them more than yourself.'
Memories of her past life surfaced, so vague and distant they seemed to belong to another person. 'Yes. That's right. So what?'
'Then you still have a job to do. I've been sent here to save you, Caitlin — or rather, to show you the path so you can save yourself… and everyone else. Come.'
He marched across the chamber, then waited for her to follow. As Caitlin watched him, she remembered what Crowther had said about the boar-king in the Forest of the Night and she suddenly understood the symbolism of the knight's strange helmet. A boar, one of the Celts' totem animals — a messenger between humanity and the gods.
'Who's that, Mummy?' Liam's voice was a pale shadow; the House of Pain was working its dark magic in him, too.
'Someone sent to haunt me, honey. Don't worry about it.' She took Liam's hand and marvelled at how cold his fingers were.
The knight led the way through the deserted corridors. Caitlin expected the House of Pain to unleash one of its twisted manifestations to bar their way, but it had either decided she was no longer worthy of its attention, or the knight in some way shrouded their passing from the House of Pain's perceptions.
Eventually they came to a room closed off by a curtain formed from that sickening meat. Caitlin could hear a noise like a thousand rats on the other side.
'Steel yourself,' the knight said. He threw open the curtain.
It was the room with the plague egg that Caitlin had seen before. The floor was swarming with thousands of the plague demons, while others were being birthed by the minute. As the knight strode forward, the demons attacked his ankles and then swarmed over him, but his armour kept them at bay. He drew his sword, and in the darkened room it glowed with a thin blue light. The demons surged away, shrieking in fear, scrambling over each other to disappear into the far corners of the room. The knight walked up to the egg and waited. Another demon emerged into the world and then hurtled away the instant it saw the sword.
'Here,' he said, offering the weapon to Caitlin when she arrived at his side. 'Destroy the egg.'
'You do it — you're the good knight,' she replied. 'Or is this just another trick to damn me?'
'Aren't you damned already?'
His logic was impeccable. She took the sword, wavering under its weight. Not so long ago she would have wielded it as though it were nothing. Now it took all her effort just to lift it.
'This will stop any more from coming out,' she said, 'but it's not going to stop the ones already infecting people in my world.'
'The egg births them and nurtures them,' the knight said. 'Without it, none of them can survive.'
The last of the House of Pain's ice fell away and Caitlin felt a rush of adrenalin. Here was her chance finally to do something good. She heaved the sword up.
Despite their terror, in that instant the plague demons recognised what was about to happen. They surged forward as one, flinging themselves from every corner, screeching and squealing, their glittering eyes filled with murderous intent.