She woke to find a stranger shaking her arm, and then as Pantalaimon sprang awake and growled, she recognized Thorold. He was holding a naphtha lamp, and his hand was trembling.

"Miss-miss-get up quickly. I don't know what to do. He's left no orders. I think he's mad, miss."

"What? What's happening?"

"Lord Asriel, miss. He's been almost in a delirium since you went to bed. I've never seen him so wild. He packed a lot of instruments and batteries in a sledge and he harnessed up the dogs and left. But he's got the boy, miss!"

"Roger? He's taken Roger?"

"He told me to wake him and dress him, and I didn't think to argue-I never have-the boy kept on asking for you, miss-but Lord Asriel wanted him alone-you know when you first came to the door, miss? And he saw you and couldn't believe his eyes, and wanted you gone?"

Lyra's head was in such a whirl of weariness and fear that she could hardly think, but "Yes? Yes?" she said.

"It was because he needed a child to finish his experiment, miss! And Lord Asriel has a way special to himself of bringing about what he wants, he just has to call for something and-"

Now Lyra's head was full of a roar, as if she were trying to stifle some knowledge from her own consciousness.

She had got out of bed, and was reaching for her clothes, and then she suddenly collapsed, and a fierce cry of despair enveloped her. She was uttering it, but it was bigger than she was; it felt as if the despair were uttering her. For she remembered his words: the energy that links body and daemon is immensely powerful; and to bridge the gap between worlds needed a phenomenal burst of energy....

She had just realized what she'd done.

She had struggled all this way to bring something to Lord Asriel, thinking she knew what he wanted; and it wasn't the alethiometer at all. What he wanted was a child.

She had brought him Roger.

That was why he'd cried out, "I did not send for you!" when he saw her; he had sent for a child, and the fates had brought him his own daughter. Or so he'd thought, until she'd stepped aside and shown him Roger.

Oh, the bitter anguish! She had thought she was saving Roger, and all the time she'd been diligently working to betray him....

Lyra shook and sobbed in a frenzy of emotion. It couldn't be true.

Thorold tried to comfort her, but he didn't know the reason for her extremity of grief, and could only pat her shoulder nervously.

"lorek-" she sobbed, pushing the servant aside. "Where's lorek Byrnison? The bear? Is he still outside?"

The old man shrugged helplessly.

"Help me!" she said, trembling all over with weakness and fear. "Help me dress. I got to go. Now.1 Do it quick!"

He put the lamp down and did as she told him. When she commanded, in that imperious way, she was very like her father, for all that her face was wet with tears and her lips trembling. While Pantalaimon paced the floor lashing his tail, his fur almost sparking, Thorold hastened to bring her stiff, reeking furs and help her into them. As soon as all the buttons were done up and all the flaps secured, she made for the door, and felt the cold strike her throat like a sword and freeze the tears at once on her cheeks.

"lorek!" she called. "lorek Byrnison! Come, because I need you!"

There was a shake of snow, a clank of metal, and the bear was there. He had been sleeping calmly under the falling snow. In the light spilling from the lamp Thorold was holding at the window, Lyra saw the long faceless head, the narrow eye slits, the gleam of white fur below red-black metal, and wanted to embrace him and seek some comfort from his iron helmet, his ice-tipped fur.

"Well?" he said.

"We got to catch Lord Asriel. He's taken Roger and he's a going to-I daren't think-oh, lorek, I beg you, go quick, my dear!"

"Come then," he said, and she leaped on his back.

There was no need to ask which way to go: the tracks of the sledge led straight out from the courtyard and over the plain, and lorek leaped forward to follow them. His motion was now so much a part of Lyra's being that to sit balanced was entirely automatic. He ran over the thick snowy mantle on the rocky ground faster than he'd ever done, and the armor plates shifted under her in a regular swinging rhythm.

Behind them, the other bears paced easily, pulling the fire hurler with them. The way was clear, for the moon was high and the light it cast over the snowbound world was as bright as it had been in the balloon: a world of bright silver and profound black. The tracks of Lord Asriel's sledge ran straight toward a range of jagged hills, strange stark pointed shapes jutting up into a sky as black as the alethiometer's velvet cloth. There was no sign of the sledge itself-or was there a feather touch of movement on the flank of the highest peak? Lyra peered ahead, straining her eyes, and Pantalaimon flew as high as he could and looked with an owl's clear vision.

"Yes," he said, on her wrist a moment later; "it's Lord Asriel, and he's lashing his dogs on furiously, and there's a boy in the back...."

Lyra felt lorek Byrnison change pace. Something had caught his attention. He was slowing and lifting his head to cast left and right.

"What is it?" Lyra said.

He didn't say. He was listening intently, but she could hear nothing. Then she did hear something: a mysterious, vastly distant rustling and crackling. It was a sound she had heard before: the sound of the Aurora. Out of nowhere a veil of radiance had fallen to hang shimmering in the northern sky. All those unseen billions and trillions of charged particles, and possibly, she thought, of Dust, conjured a radiating glow out of the upper atmosphere. This was going to be a display more brilliant and extraordinary than any Lyra had yet seen, as if the Aurora knew the drama that was taking place below, and wanted to light it with the most awe-inspiring effects.

But none of the bears were looking up: their attention was all on the earth. It wasn't the Aurora, after all, that had caught lorek's attention. He was standing stock-still now, and Lyra slipped off his back, knowing that his senses needed to cast around freely. Something was troubling him.

Lyra looked around, back across the vast open plain leading to Lord Asriel's house, back toward the tumbled mountains they'd crossed earlier, and saw nothing. The Aurora grew more intense. The first veils trembled and raced to one side, and jagged curtains folded and unfolded above, increasing in size and brilliance every minute; arcs and loops swirled across from horizon to horizon, and touched the very zenith with bows of radiance. She could hear more clearly than ever the immense singing hiss and swish of vast intangible forces.

"Witches!" came a cry in a bear voice, and Lyra turned in joy and relief.

But a heavy muzzle knocked her forward, and with no breath left to gasp she could only pant and shudder, for there in the place where she had been standing was the plume of a green-feathered arrow. The head and the shaft were buried in the snow.

Impossible.! she thought weakly, but it was true, for another arrow clattered off the armor of lorek, standing above her. These were not Serafina Pekkala's witches; they were from another clan. They circled above, a dozen of them or more, swooping down to shoot and soaring up again, and Lyra swore with every word she knew.

lorek Byrnison gave swift orders. It was clear that the bears were practiced at witch fighting, for they had moved at once into a defensive formation, and the witches moved just as smoothly into attack. They could only shoot accurately from close range, and in order not to waste arrows they would swoop down, fire at the lowest part of their dive, and turn upward at once. But when they reached the lowest point, and their hands were busy with bow and arrow, they were vulnerable, and the bears would explode upward with raking paws to drag them down. More than one fell, and was quickly dispatched.

Lyra crouched low beside a rock, watching for a witch dive. A few shot at her, but the arrows f............