They were finished; it was only a matter of time. A gorilla charged him, bellowing in rage, swinging stone paddles wide. Terrified, Amy threw her hands over Elliot’s eyes. “Amy!” he shouted, pulling her fingers away, expecting to feel at any moment the impact of the paddles and the instant of blinding pain.

He saw the gorilla hearing down on him. He tensed his body. Six feet away, the charging gorilla stopped so abruptly that he literally skidded in the mud and fell backward. He sat there surprised, cocking his head, listening.

Then Elliot realized that the rain had nearly stopped, that there was now only a light drizzle sifting down over the campsite. Looking across the compound, Elliot saw another gorilla stop to listen-then another-and another-and another. The compound took on the quality of a frozen tableau, as the gorillas stood silent in the mist.

They were listening to the broadcast sounds.

He held his breath, not daring to hope. The gorillas seemed uncertain, confused by the sounds they heard. Yet Elliot sensed that at any moment they could arrive at some group decision and resume their attack with the same intensity as before.

That did not happen. The gorillas stepped away from the people, listening. Munro scrambled to his feet, raising his gun from the mud. but he did not shoot; the gorilla standing over him seemed to be in a trance, to have forgotten all about the attack.

In the gentle rain, with the flickering night lights, the gorillas moved away, one by one. They seemed perplexed, off balance. The rasping continued over the loudspeaker.

The gorillas left, moving back across the trampled perimeter fence, disappearing once more into the jungle. And then the expedition members were alone, staring at each other, shivering in the misty rain. The gorillas were gone.

Twenty minutes later, as they were trying to rebuild their shattered campsite, the rain poured down again with unabated fury.

IN THE MORNING A FINE LAYER OF BLACK ASH covered the campsite, and in the distance Mukenko was belching great quantities of black smoke. Amy tugged at Elliot’s sleeve.

Leave now, she signed insistently.

“No, Amy,” he said.

Nobody in the expedition was in a mood to leave, including Elliot. Upon arising, he found himself thinking of additional data he needed before leaving Zinj. Elliot was no

longer satisfied with a skeleton of one of these creatures; like men, their uniqueness went beyond the details of physical structure to their behavior. Elliot wanted videotapes of the gray apes, and more recordings of verbalizations. And Ross was more determined than ever to find the diamonds, with Munro no less interested.

Leave now.

“Why leave now?” he asked her.

Earth bad. Leave now.

Elliot had no experience with volcanic activity, but what he saw did not impress him. Mukenko was more active than it had been in previous days, but the volcano had ejected smoke and gas since their first arrival in Virunga.

He asked Munro, “Is there any danger?”

Munro shrugged. “Kahega thinks so, but he probably just wants an excuse to go home.”

Amy came running over to Munro raising her arms, slapping them down on the earth in front of him. Munro recognized this as her desire to play; he laughed and began to tickle Amy. She signed to him.

“What’s she saying?” Munro asked. “What are you saying, you little devil?”

Amy grunted with pleasure, and continued to sign.

“She says leave now,” Elliot translated.

Munro stopped tickling her. “Does she?” he asked sharply. What exactly does she say?”

Elliot was surprised at Munro’s seriousness-although Amy accepted his interest in her communication as perfectly proper. She signed again, more slowly, for Munro’s benefit, her eyes on his face.

“She says the earth is bad.”

“Hmm,” Munro said. “Interesting.” He glanced at Amy and then at his watch.

Amy signed, Nosehair man listen Amy go home now.

“She says you listen to her and go home now,” Elliot said.

Munro shrugged. “Tell her I understand.”

Elliot translated. Amy looked unhappy, and did not sign again.

“Where is Ross?” Munro asked.

“Here,” Ross said.

“Let’s get moving,” Munro said, and they headed for the lost city. Now they had another surprise-Amy signed she was coming with them, and she hurried to catch up with them.

This was their final day in the city, and all the participants in the Congo expedition described a similar reaction: the city, which had been so mysterious before, was somehow stripped of its mystery. On this morning, they saw the city for what it was: a cluster of crumbling old buildings in a hot stinking uncomfortable jungle.

They all found it tedious, except for Munro. Munro was worried.

Elliot was bored, talking about verbalizations and why he wanted tape recordings, and whether it was possible to preserve a brain from one of the apes to take back with them. It seemed there was some academic debate about where language came from; people used to think language was a development of animal cries, but now they knew that animal barks and cries were controlled by the limbic system of the brain, and that real language came from some other part of the brain called Broca’s area… Munro couldn’t pay attention. He kept listening to the distant rumbling of Mukenko.

Munro had firsthand experience with volcanoes; he had been in the Congo in 1968, when Mbuti, another of the Virunga volcanoes, erupted. When he had heard the sharp explosions the day before, he had recognized them as bromides, the unexplained accompaniments of coming earthquakes. Munro had assumed that Mukenko would soon erupt, and when he had seen the flickering laser beam the night before, he had known there was new rumbling activity on the upper slopes of the volcano.

Munro knew that volcanoes were unpredictable-as witnessed by the fact that this ruined city at the base of an active volcano had been untouched after more than five hundred years. There were recent lava fields on the mountain slopes above, and others a few miles to the south, but the city itself was spared. This in itself was not so remarkable-the configuration of Mukenko was such that most eruptions occurred on the gentle south slopes. But it did not mean that they were now in any less danger. The unpredictability of volcanic eruptions meant that they could become life-threatening in a matter of minutes. The danger was not from lava, which rarely flowed faster than a man could walk; it would take hours for lava to flow down from Mukenko’s summit. The real danger from volcanic eruptions was ash and gas.

Just as most people killed by fires actually died from smoke inhalation, most deaths from volcanoes were caused by asphyxiation from dust and carbon monoxide. Volcanic gases were heavier than air, the Lost City of Zinj, located in a valley, could be filled in minutes with a heavy, poisonous atmosphere, should Mukenko discharge a large quantity of gas.

The question was how rapidly Mukenko was building toward a major eruptive phase. That was why Munro was so interested in Amy’s reactions: it was well known that primates could anticipate geological events such as earthquakes and eruptions. Munro was surprised that Elliot, babbling away about freezing gorilla brains, didn’t know about that. And he was even more surprised that Ross, with her extensive geological knowledge, did not regard the morning ash-fall as the start of a major volcanic eruption.

Ross knew a major eruption was building. That morning, she had routinely tried to establish contact with Houston; to her surprise, the transmission keys immediately locked through. After the scrambler notations registered, she began typing in field updates, but the screen went blank, and flashed: