The fur-trading business was wiped out in an orgy of murder, and the ivory hunters started coming in. Fine ivory found a ready market in the master carvers of China and other parts of the world. Recognizing the white bonanza, the Russian government awarded franchises to entrepreneurs. One businessman hired an agent named Sannikoff, who explored all the Arctic islands.

Ivory Island held the richest trove, but because of its remoteness it was left relatively unscathed in favor of more accessible sources to the south. A few intrepid ivory hunters established a settlement at the mouth of the river, which they called Ivorytown, the book said, but the island had been largely abandoned in favor of more hospitable locations.

The knock on the cabin door interrupted his research. It was the captain, a round-faced man who was half Russian, half Eskimo.

"The boat is ready to take you ashore," the captain said.

Grabbing his duffel bag, Schroeder followed the captain to the port rail of the trawler and climbed down a ladder to a rowboat. While a crewman pulled at the oars, Schroeder used a long-handled gaff to fend off hunks of ice that floated in the still, cold water. Minutes later, the bottom of the boat scraped onto the gravelly beach.

Schroeder tossed his bag onto the beach, got out of the boat and helped push it off.

He watched the skiff disappear into the mists. Although the fishing boat was only a few hundred yards offshore, it was barely visible behind the damp, vaporous curtain of mist. The agreement was for the boat to wait twenty-four hours. Schroeder would stand on the beach and signal for a pickup. He hoped he would have Karla with him. It hadn't occurred to him before whether she would be persuaded enough by his warning of danger to leave the island. He would deal with that problem later. His immediate task was to find her. He hoped it was not too late. He was in good shape for his age, but his body couldn't deny the fact that it had nearly eight hard decades behind it and was starting to fray around the edges. His muscles and joints ached, and he had developed a limp in one leg.

Schroeder heard the grumble of the fishing boat's engine. The boat was moving off. The captain must have decided that he would rather leave with only half the money than wait for Schroeder to return, as they had agreed, before he was paid the entire fee. Schroeder shrugged. He had the captain pegged as a pirate from the beginning. There was no going back now.

He studied what he could see of the island. The beach rose gradually to a low banking, which wouldn't be difficult to climb. He shouldered his duffel bag, moved closer and saw that there were boot prints in the sand. This must be the main route to Ivorytown.

He hiked along the river for around ten minutes and laughed out loud when he set eyes on the pitiful encampment of sorry-looking buildings that had been labeled a town. The large, colorful tents erected next to the old structures told him he had found the expedition's campsite.

As he approached the camp, he was surprised to see that the structures, which he had assumed to be of stone, were actually built of thousands of large bones. He poked his head into a couple of buildings and saw some sleeping bags. A third building was locked for some inexplicable reason. He explored the tents and discovered one of them had been set up as a kitchen and mess hall. Schroeder walked around the perimeter of the encampment and called out several times, but there was no reply. He looked off toward the brooding, old volcano and scanned the island but saw no movement. He was not surprised; an army could have hidden in the maze of ravines that laced the island.

He trekked back to the river and saw boot prints along the edge leading into the interior. His practiced eye picked out five different sets of boot prints, including two smaller, less deep ones that looked as if they belonged to women. He felt less tired, energized by the prospect of a reunion with his goddaughter, and began to pick up his pace. Some time later, Schroeder's elation changed to alarm.

Heavy boot tracks obliterated the others. Karla and her party were being stalked.

23

From the top of the knoll she had climbed, Karla could see that Ivory Island was not the arctic desert she had first assumed it to be. The tundra was treeless, but it was thick with low-lying, dwarf shrubs, grasses, mosses and sedges that formed a muted carpet. Dandelions, buttercups and fireweed created vibrant splashes of color. The morning sunlight glittered on distant lakes and rivers. Noisy seabirds wheeled overhead.

In her mind's eye, she pictured the rugged landscape as verdant grassland, the steppes teeming with vast herds of woolly mammoth. There would have been bison and woolly rhinos, giant ground sloths, all stalked by predators like the scimitar or saber-toothed cats. She could almost smell the musky animal odor and feel the ground shake from the passage of thousands of huge animals.

Somehow, as if an evil sorcerer had waved a magic wand, the mammoths and the other creatures had became extinct. The question of extinction had intrigued her as far back as she could remember. Like many children, she had been fascinated by dinosaurs and the great mammals that succeeded them as the earth's masters.

Her grandfather was the only scientist she knew, so of course she went to him and asked what had caused these magnificent creatures to die. She had listened wide-eyed as he explained how the world had shifted, and asked him if it could happen again. He had said yes, and she had been unable to sleep. Seeing her fear, a few nights later he had taught her a nursery rhyme that would make the topsy-turvy world right again. She was trying to dig the rhyme from her memory when she heard someone shout.

"Karla!"

Maria Arbatov was waving her arms at Karla. The expedition was ready to get moving again. Karla started walking back to rejoin the others. It was time to return to the task at hand. She knew it would not be easy. The discovery of the baby mammoth carcass had been an astounding stroke of luck. But Ivory Island was a rich trove of the ancient past. If she couldn't find what she wanted here, she should forsake field trips forever and stick to cataloging museum specimens.

Fortified by a hearty breakfast, the expedition got off to an early start that morning. Ito and Sato were ready before anyone else. They were dressed identically in warm-weather clothes, from their boots to their hats. Sergei was grumpier than usual, and even Maria's lovely smile couldn't dispel his sour mood, so she just ignored him.

They had shouldered their packs and headed into the interior of the island, using the river as a guide. They made good time across the flat tundra. By midmorning, when they had taken their first break, near Karla's knoll, they had trudged several miles.

As she hoisted her pack to resume the trek, Karla said: "I've been wondering. How did you transport the specimen all the way back to the camp? It must weigh hundreds of pounds."

Ito smiled and pointed to the packs he and Sato were carrying. "Inflatable rafts. We got the specimen to the river and floated all the way back to camp."

Ito smiled and bowed politely when Karla congratulated them on their ingenuity.

Sergei took up the lead, followed by the two women with the Japanese men taking up the rear. They struck off inland, away from the river. The topography changed from flat tundra to rolling hills and valleys, and eventually they were on the edge of the rolling foothills that ringed the base of the volcano. As they drew closer to it, the black, truncated mountain that they had seen in the distance began to loom above their head like an altar to Vulcan, the lord of the underworld.