For some reason, they had built on low swampy ground. Water had reclaimed most of the tall brick structures. Marsh grass grew between the houses and waved on their roofs. This place had been in decline for a long time. It was more of a village, anyway, thought Livia; the houses ended not more than two hundred meters away. Once there had been frescoes on the sides of the buildings, and statues, but they had been weathered away long ago.

The drummers' microcivilization had run its natural course, and now uncomprehending outsiders had come to lay it to rest.

The expedition left the carriages and walked, sometimes wading, out into the city. They split up and began to poke about. The place was desolate, like something out of a historical sim. Livia's feet were soon wet and she found herself shivering. When she met Rene coming around the side of a large (and empty) public building, she said, "Why would anyone stay here?"

He shrugged. "There were never many of them. But apparently it was quite the religious center once. Reaching the divine through music. You're a musician, you'd have loved it here."

"But they never wrote any of it down. And they didn't perform for pleasure."

They walked on for a while, but whatever possessions the drummers had once had, they were gone, toppled into the swampy water or taken away by those who had abandoned this place's values. Rene shook his head at last.

"They're dead. I dunno about you, but I agree with the others. We should shut it down and reclaim the land."

Livia shook her head. "And just replace their reality with ours? Better if we could all learn to travel here. That would be diplomacy."

"But they're all dead. So what's to stop us?"

Livia opened her mouth to reply, then stopped. She couldn't explain why, but she felt there was still a presence here, however tenuous. It felt wrong to simply wipe the place away — but it was hard to justify preserving it; doing so would go against her very public political stance.

She decided to change the subject. "We lost you for a while back there," she said at last. "You're not very musical?"

He grinned. "Maybe I'm not. And you are not nearly as scary up close as I was told you'd be."

Her heart sank. "Who told you I was scary?"

He waggled his fingers in horror-show fashion. "You and Aaron Varese are the biggest political critics of the generation. You fight duels over ideas, for God's sake! And you ... they say you blink out during parties, come out with odd pronouncements at odd times, have strange notions ... You've Seen Things We Were Not Meant To Know. You're the one who led the survivors out of the crash zone, right? They say it changed you."

"But I don't remember doing it," she said seriously. "How can I be a hero if I — " At that moment they both heard the drumming.

It came from somewhere ahead: a single, steady beat, deep and confident. Livia and Rene looked at one another.

"Not dead after all!" Rene sprinted in the direction of the sound; more cautiously, Livia followed.

She found him staring up the side of a ten-meter mud-brick tower. The steady drumbeat sounded from somewhere overhead. He looked at her uncertainly. "Do we go in?"

She looked around for footprints on the muddy ground; there were none, not even at the shadowed entrance to the tower. But she would not look weak in front of this young man. "Of course," she said.

Inside, the tower was divided into three levels with lad-derlike stairways leading between them. They found large clay pots filled with grain and dried fish; firewood and the hardened, cold remains of a fire; blankets and a crude pillow. But there was no other sign of life. The sound obstinately continued above. "A recording?" Rene whispered. She shook her head: recording equipment of any kind was forbidden by the locks in this place.

Cautiously, they climbed the creaking steps to the top level.

Someone had rigged a barrel on a tripod here to catch rainwater. From the base of the barrel, a spigot dripped steadily onto the taut skin of a large bass drum. The skin was discolored and worn where the water had been hitting it for days — weeks, probably. But the sound was steady, and impressively loud.

Huddled beside the drum was a half-skeletal body: the last inhabitant of the drummers' manifold. Livia couldn't be sure whether this had been a man or a woman. But it was clear he or she had died alone.

It stank up here so they retreated down the ladder almost immediately. Neither spoke until they were outside again. Rene waved to Serena and some others who were walking nearby. As they came over, Livia stood looking up — and listening.

"Why didn't he leave?" Rene asked after a while.

And of course, that was it: to leave this place, all you had to do was wish to be somewhere else. With a little concentration Livia could return to Westerhaven, and these towers would turn into trees, or rocks, or otherwise leave her sensorium. Barrastea's skyscrapers would appear over the crest of the hill. Inscape reticles and Societies would blossom all around her. This person, this last drummer, did not have to die alone. He or she could have chosen, right up until the last second, to abandon the Drummers' ideals — to join another manifold.

Yet the drum still sounded above, slow and steady, like the heartbeat of the world. Livia could not have answered Rene's question; she did not have the words. But, for a moment or two, as she stood within the realm of that beating heart, she thought she understood.

When Serena and the others came running up, Livia announced, "The last drummer may be dead, but the Drummers are still alive. We can't shut down this manifold while the drum still beats."

Unanimity was required for the manifold to be closed. And so the absorption of the drummers' resources into Westerhaven had been postponed — and while Livia's reputation had grown, her authority had begun to deteriorate.

"I don't know why I did it," she said to Lucius as they walked. They'd seen nothing impossible in the past hour and she was getting tired. She had dismissed her Society, however, and was enjoying this rare chance for a solitary talk with an older male friend. "I think it was just to spite Serena."

He laughed. "A fine reason by itself. But is that all?"

"I don't know. For years now I've felt like an outsider. Ever since the accident. People look at me differently, you know. Since only Aaron and I survived ... " She kicked at a fern. "It's like it was our fault, somehow."

She was used to people trying to reassure her on this point, but Lucius nodded. "It's hypocritical," he said. "People here talk about valuing other manifolds, but really Westerhaven is a culture of butterfly collectors."

"How do you mean?"

"You catch the butterfly alive, then you stick a pin through it and mount it on the wall. That's what we do with other cultures. Like your drummers. You were right to leave their world alone, Liv."

"Well, thank you! Practically nobody else has said that."

"We outsiders have to stick together," he said. "That's why I invited you along today." He hesitated. "Livia. There's something I have to tell you. It's about — "

She threw out her hand to stop him, practically falling herself. Raising a finger to her lips, she pointed ahead along the path.

He scowled, then turned to follow her gaze.

"Lucius, I think something impossible might just be happening."

Standing nonchalantly about ten meters ahead was a tall, bronze-skinned man dressed in tanned hides. A dozen beaded necklaces hung around his neck.

He was carrying a spear.