But the bear’s attention was not human, and he could see what was happening, and he knew it was yet another extraordinary power at Will’s command. He came close and spoke quietly, in a voice that seemed to throb as deeply as the ship’s engines.

"What is your name?" he said.

"Will Parry. Can you make another helmet?"

"Yes. What do you seek?"

"You’re going up the river. I want to come with you. I’m going to the mountains and this is the quickest way. Will you take me?"

"Yes. I want to see that knife."

"I will only show it to a bear I can trust. There is one bear I’ve heard of who’s trustworthy. He is the king of the bears, a good friend of the girl I’m going to the mountains to find. Her name is Lyra Silvertongue. The bear is called Iorek Byrnison."

"I am Iorek Byrnison," said the bear.

"I know you are," said Will.

The boat was taking fuel on board; the railcars were hauled alongside and tilted sideways to let coal thunder down the chutes into the hold, and the black dust rose high above them. Unnoticed by the townspeople, who were busy sweeping up glass and haggling over the price of the fuel, Will followed the bear-king up the gangway and aboard the ship.

"Let me see the knife," said Iorek Byrnison. "I understand metal. Nothing made of iron or steel is a mystery to a bear. But I have never seen a knife like yours, and I would be glad to look at it closely."

Will and the bear-king were on the foredeck of the river steamer, in the warm rays of the setting sun, and the vessel was making swift progress upstream; there was plenty of fuel on board, there was food that Will could eat, and he and Iorek Byrnison were taking their second measure of each other. They had taken the first already.

Will held out the knife toward Iorek, handle first, and the bear took it from him delicately. His thumb claw opposed the four finger claws, letting him manipulate objects as skillfully as a human, and now he turned the knife this way and that, bringing it closely to his eyes, holding it to catch the light, testing the edge—the steel edge—on a piece of scrap iron.

"This edge is the one you cut my armor with," he said. "The other is very strange. I cannot tell what it is, what it will do, how it was made. But I want to understand it. How did you come to possess it?"

Will told him most of what had happened, leaving out only what concerned him alone: his mother, the man he killed, his father.

"You fought for this, and lost two fingers?" the bear said. "Show me the wound."

Will held out his hand. Thanks to his father’s ointment, the raw surfaces were healing well, but they were still very tender. The bear sniffed at them.

"Bloodmoss," he said. "And something else I cannot identify. Who gave you that?"

"A man who told me what I should do with the knife. Then he died. He had some ointment in a horn box, and it cured my wound. The witches tried, but their spell didn’t work."

"And what did he tell you to do with the knife?" said Iorek Byrnison, handing it carefully back to Will.

"To use it in a war on the side of Lord Asriel," Will replied. "But first I must rescue Lyra Silvertongue."

"Then we shall help," said the bear, and Will’s heart leapt with pleasure.

Over the next few days Will learned why the bears were making this voyage into Central Asia, so far from their homeland.

Since the catastrophe that had burst the worlds open, all the Arctic ice had begun to melt, and new and strange currents appeared in the water. Since the bears depended on ice and on the creatures who lived in the cold sea, they could see that they would soon starve if they stayed where they were; and being rational, they decided how they should respond. They would have to migrate to where there was snow and ice in plenty: they would go to the highest mountains, to the range that touched the sky, half a world away but unshakable, eternal, and deep in snow. From bears of the sea they would become bears of the mountains, for as long as it took the world to settle itself again.

"So you’re not making war?" Will said.

"Our old enemies vanished with the seals and the walruses. If we meet new ones, we know how to fight."

"I thought there was a great war coming that would involve everyone. Which side would you fight for in that case?"

"The side that gave advantage to the bears. What else? But I have some regard for a few among humans. One was a man who flew a balloon. He is dead. The other is the witch Serafina Pekkala. The third is the child Lyra Silvertongue. First, I would do whatever serves the bears. Second, whatever serves the child, or the witch, or avenges my dead comrade Lee Scoresby. That is why I will help you rescue Lyra Silvertongue from the abominable woman Coulter."

He told Will of how he and a few of his subjects had swum to the river mouth and paid for the charter of this vessel with gold, and hired the crew, and turned the draining of the Arctic to their own advantage by letting the river take them as far inland as it could—and as it had its source in the northern foothills of the very mountains they sought, and as Lyra was imprisoned there, too, things had fallen out well so far.

So time went past.

During the day Will dozed on deck, resting, gathering strength, because he was exhausted in every part of his being. He watched as the scenery began to change, and the rolling steppe gave way to low grassy hills and then to higher land, with the occasional gorge or cataract; and still the boat steamed south.

He talked to the captain and the crew, out of politeness, but lacking Lyra’s instant ease with strangers, he found it difficult to think of much to say; and in any case they were little interested in him. This was only a job, and when it was over they would leave without a backward glance, and besides, they didn’t much like the bears, for all their gold. Will was a foreigner, and as long as he paid for his food, they cared little what he did. Besides, there was that strange daemon of his, which seemed so like a witch’s: sometimes it was there, and sometimes it seemed to have vanished. Superstitious, like many sailors, they were happy to leave him alone.

Balthamos, for his part, kept quiet, too. Sometimes his grief would become too strong for him to put up with, and he’d leave the boat and fly high among the clouds, searching for any patch of light or taste of air, any shooting stars or pressure ridges that might remind him of experiences he had shared with Baruch. When he talked, at night in the dark of the little cabin Will slept in, it was only to report on how far they had gone, and how much farther ahead the cave and the valley lay. Perhaps he thought Will had little sympathy, though if he’d sought it, he would have found plenty. He became more and more curt and formal, though never sarcastic; he kept that promise, at least.

As for Iorek, he examined the knife obsessively. He looked at it for hours, testing both edges, flexing it, holding it up to the light, touching it with his tongue, sniffing it, and even listening to the sound the air made as it flowed over the surface. Will had no fear for the knife, because Iorek was clearly a craftsman of the highest accomplishment; nor for Iorek himself, because of the delicacy of movement in those mighty paws.

Finally Iorek came to Will and said, "This other edge. It does something you have not told me about. What is it, and how does it work?"

"I can’t show you here," said Will, "because the boat is moving. As soon as we stop, I’ll show you."

"I can think of it," said the bear, "but not understand what I am thinking. It is the strangest thing I have ever seen."

And he gave it back to Will, with a disconcerting, unreadable long stare out of his deep black eyes.