The Miwok's hunts were big parties in the hills, all day events that Kheim and his men were allowed to join. The bows used by the Miwok were weak but adequate. Kheim ordered his sailors to leave the crossbows and guns hidden on the ships, and the cannon were simply left to view but not explained, and none of the locals asked about them.

On one of these hunting trips Kheim and I Chen followed the headman, Ta Ma, and some of the Miwok men up the stream that poured through their village, up into hills to a high meadow that had a view of the ocean to the west. To the cast they could see across the bay, to range after range of green hills.

The meadow was marshy by the stream, grassy above it, with stands of oak and other trees tufting the air. There was a lake at the lower end of the meadow that was entirely covered with geese – a white blanket of living birds, all honking now, upset by something, complaining. Then the whole flock thrashed into the air, groups swirling and fragmenting, coming together, flying low over the hunters, squawking or silently concentrating, on flight, the distinctive creak of their pumping wing feathers loud in the air. Thousands on thousands.

The men stood and watched the spectacle, eyes bright. When the geese had all departed, they saw the reason they had left; a herd of giant deer had come to the lake to drink. The stags had huge racks of antlers. They stared across the water at the men, vigilant but undeterred.

For a moment, all was still.

In the end the giant deer stepped away. Reality awoke again. 'All sentient beings,' said I Chen, who had been muttering his Buddhist sutras all along. Kheim normally had no time for such claptrap, but now, as the day continued, and they hiked over the hills on their hunt, seeing great numbers of peaceful beaver, quail, rabbits, foxes, seagulls and crows, ordinary deer, a bear and two cubs, a slinky long tailed grey hunting creature, like a fox crossed with a squirrel – on and on – simply a whole country of animals, living together under a silent blue sky nothing disturbed, the land flourishing on its own, the people there just a small part of it – Kheim began to feel odd. He realized that he had taken China for reality itself. Taiwan and the Mindanaos and the other islands he had seen were like scraps of land, leftovers; China had seemed to him the world. And China meant people. Built up, cultivated, parcelled off ha by ha, it was so completely a human world that Kheim had never considered that there might once have been a natural world different to it. But here was natural land, right before his eyes, full as could be with animals of every kind, and obviously very much bigger than Taiwan; bigger than China; bigger than the world he had known before.

'Where on Earth are we?' he said to I Chen I Chen said, 'We have found the source of the peach blossom stream.'

Winter arrived, and yet it stayed warm during the days, cool at night. The Miwok gave them cloaks of sea otter pelts sewn together with leather thread, and nothing could have been more comfortable against the skin, they were as luxurious as the clothes of the jade Emperor. During storms it rained and was cloudy, but otherwise it was bright and sunny. This was all happening at the same latitude as Beijing, according to I Chen, and at a time of year when it would have been bitterly cold and windy there, so the climate was much remarked on by the sailors. Kheim could scarcely believe the locals when they said it was like this every winter.

On the winter solstice, a sunny warm day like all the rest, the Miwok invited Kheim and I Chen into their temple, a little round thing like a dwarves' pagoda, the floor sunken into the earth and the whole thing covered with sod, the weight of which was held up by some tree trunks forking up into a nest of branches. It was like being in a cave, and only the fire's light and the smoky sun shafting down through a smokehole in the roof illuminated the dim interior. The men were dressed in ceremonial feather headdresses and many shell necklaces, which gleamed in the firelight. To a constant drum rhythm they danced round the fire, taking turns as night followed day, going on until it seemed to the stupefied Kheim that they might never stop. He struggled to stay awake, feeling the importance of the event for these men who looked somehow like the animals they fed on. This day marked the return of the sun, after all. But it was hard to stay awake. Eventually he struggled to his feet and joined the younger dancers, and they made room for him as he galumphed about, his sea legs bandying out to the sides. On and on he danced, until it felt right to collapse in a corner, and only emerge at the last part of dawn, the sky fully lit, the sun about to burst over the hills backing the bay. The happy loose limbed band of dancers and drummers was led by a group of the young unmarried women to their sweat lodge, and in his stupefied state Kheim saw how beautiful the women were, supremely strong, as robust as the men, their feet unbound and their eyes clear and without deference – indeed they appeared to laugh heartily at the weary men as they escorted them into the steam bath, and helped them out of their headdresses and finery, making what sounded like ribald commentary to Kheim, though it was possible he was only making it up out of his own desire. But the burnt air, the sweat pouring out of him, the abrupt clumsy plunge into their little river, blasting him awake in the morning light; all only increased his sense of the women's loveliness, beyond anything he could remember exper encing in China, where a sailor was always being taken by the precious blown flower girls in the restaurants. Wonder and lust and the river's chill battled his exhaustion, and then he slept on the beach in the sun.

He was back on the flagship when I Chen came to him, mouth tight. 'One of them died last night. They brought me to see. It was the pox.'

'What! Are you sure?'

I Chen nodded heavily, as grim as Kheim had ever seen him.

Kheim rocked back. 'We will have to stay on board the ships.'

'We should leave,' I Chen said. 'I think we brought it to them.'

'But how? No one had pox on this trip.'

'None of the people here have any pox scars at all. I suspect it is new to them. And some of us had it as children, as you can see. Li and Peng are heavily pocked, and Peng has been sleeping with one of the local women, and it was her child died of it. And the woman is sick too.'

'No.'

'Yes. Alas. You know what happens to wild people when a new sickness arrives. I've seen it in Aozhou. Most of them die. The ones who don't will be balanced against it after that, but they may still be able to tip others of the unexposed off their balance, I don't know. In any case, it's bad.'

They could hear little Butterfly squealing up on the deck, playing some game with the sailors. Kheim gestured above. 'What about her?'

'We could take her with us, I suppose. If we return her to shore, she'll probably die with the rest.'

'But if she stays with us she may catch it and die too.'

'True. But I could try to nurse her through it.'

Kheim frowned. Finally he said, 'We're provisioned and watered. Tell the men. We'll sail south, and get in position for a spring crossing back to China.'

Before they left, Kheim took Butterfly and rowed up to the village's beach and stopped well offshore. Butterfly's father spotted them and came down quickly, stood knee deep in the slack tidal water and said something. His voice croaked, and Kheim saw the pox blisters on him. Kheim's hands rowed the boat out a stroke.

'What did he say?' he asked the girl.

'He said people are sick. People are dead.'

Kheim swallowed. 'Say to him, we brought a sickness with us.'

She looked at him, not comprehending.

'Tell him we brought a sickness with us. By accident. Can you say that to him? Say that.'