In a matter of minutes, they had moved several hundred yards from the road. The ice there was bare and hard, the treads of the snowtracks scratching and squeaking as they crossed it.

"You're on ice now," Bolden said.

"I noticed."

"Won't be long now."

Evans was looking out the window. He could no longer see the road. In fact, he wasn't sure anymore in which direction it lay. Everything now looked the same. He felt anxious suddenly. "We're really in the middle of nowhere."

The snowtrack slid laterally a little, across the ice. He grabbed for the dashboard. Sarah immediately brought the vehicle back under control.

"Jeez," Evans said, clinging to the dashboard.

"Are you a nervous passenger?" she said.

"Maybe a little."

"Too bad we can't get some music. Is there any way to get music?" she asked Bolden.

"You should," Bolden said. "Weddell broadcasts twenty-four hours. Just a minute." He stopped his snowtrack, and walked back to their stopped vehicle. He climbed up on the tread and opened the door, in a blast of freezing air. "Sometimes you get interference from this," he said, and unclipped the transponder from the dash. "Okay. Try your radio now."

Sarah fiddled with the receiver, twisting the knob. Bolden walked back to his red cab, carrying the transponder. His diesel engine spit a cloud of black exhaust as he put the snowtrack in gear.

"You think they'd be a little more ecologically minded," Evans said, looking at the exhaust as Bolden's snowtrack chugged forward.

"I'm not getting any music," Sarah said.

"Never mind," Evans said. "I don't care that much."

They drove another hundred yards. Then Bolden stopped again.

"Now what?" Evans said.

Bolden climbed out of his vehicle, walked to the back of it, and looked at his own treads.

Sarah was still fiddling with the radio. Punching the buttons for the different transmission frequencies, she got bursts of static for each.

"I'm not sure this is an improvement," Evans said. "Just let it go. Why have we stopped, anyway?"

"I don't know," Sarah said. "He seems to be checking something."

Now Bolden turned and looked back at them. He didn't move. He just stood there and stared.

"Should we get out?" Evans said.

The radio crackled and they heard "-is Weddell CM to-401. Are you there, Dr. Kenner? Weddell CM to-Kenner. Can you hear-?"

"Hey," Sarah said, smiling. "I think we finally got something."

The radio hissed and sputtered.

"-just found Jimmy Bolden unconscious in-maintenance room. We don't know who is-out there with-but it's not-"

"Oh shit," Evans said, staring at the man in front of them. "That guy's not Bolden? Who is he?"

"I don't know, but he's blocking the way," Sarah said. "And he's waiting."

"Waiting for what?"

There was a loud crack! crack! from beneath them. Inside the cab, the sound echoed like a gunshot. Their vehicle shifted slightly. from beneath them. Inside the cab, the sound echoed like a gunshot. Their vehicle shifted slightly.

"Screw this," Sarah said. "We're getting out of here, even if I have to ram the bastard." She put the snowtrack in gear, and started to back away from the vehicle in front of them. She shifted, starting the snowtrack forward again.

Another crack! crack!

"Let's go!" Evans said. "Let's go! go!"

Crack! Crack! Their vehicle lurched beneath them, tilted sideways at an angle. Evans looked out at the guy pretending to be Bolden. Their vehicle lurched beneath them, tilted sideways at an angle. Evans looked out at the guy pretending to be Bolden.

"It's the ice," Sarah said. "He's waiting for our weight to break through."

"Ram him!" Evans said, pointing ahead. The bastard was making some hand gesture to them. It took him a moment for Evans to understand what it meant. Then he got it.

The man was waving goodbye.

Sarah stomped on the accelerator and the engine rumbled forward, but in the next moment the ground gave way completely beneath them, and their vehicle nosed down. Evans saw the blue-ice wall of a crevasse. Then the vehicle began to tumble forward, and they were encased for an instant in a world of eerie blue before they plunged onward into the blackness below.

SHEAR ZONE.

WEDNESDAY, OCTOBER 6.

3:51 P.M.

Sarah opened her eyes and saw a huge blue starburst, streaks radiating outward in all directions. Her forehead was icy cold, and she had terrible pain in her neck. Tentatively, she shifted her body, checking each of her limbs. They hurt, but she could move all of them except her right leg, which was pinned under something. She coughed and paused, taking stock. She was lying on her side, her face shoved up against the windshield, which she had shattered with her forehead. Her eyes were just inches from the fractured glass. She eased away, and slowly looked around.

It was dark, a kind of twilight. Faint light coming from somewhere to her left. But she could see that the whole cab of the snowtrack was lying on its side, the treads up against the ice wall. They must have landed on a ledge of some kind. She looked upward-the mouth of the crevasse was surprisingly close, maybe thirty or forty yards above her. It was near enough to give her a burst of encouragement.

Next she looked down, trying to see Evans. But it was dark everywhere beneath her. She couldn't see him at all. Her eyes slowly adjusted. She gasped. She saw her true situation.

There was no ledge.

The snowtrack had tumbled into the narrowing crevasse, and wedged itself sideways within the crevasse walls. The treads were against one wall, the roof of the cab against the other, and the cab itself was suspended over the inky downward gash. The door on Evans's side hung open.

Evans was not in the cab.

He had fallen out.

Into the blackness.

"Peter?"

No answer.

"Peter, can you hear me?"

She listened. There was nothing. No sound or movement.

Nothing at all.

And then the realization hit her: She was alone down there. She was alone down there. A hundred feet down in a freezing crevasse, in the middle of a trackless ice field, far off the road, miles from anywhere. A hundred feet down in a freezing crevasse, in the middle of a trackless ice field, far off the road, miles from anywhere.

And she realized, with a chill, that this was going to be her tomb.

Bolden-or whoever he was-had planned it very well, Sarah thought. He had taken their transponder. He could drive a few miles, drop it down the deepest crevasse he could find, and then go back to the base. When the rescue parties set out, they would head for the transponder. It would be nowhere near where she was. The party might search for days in a deep crevasse before giving up.

And if they widened the search? They still wouldn't find the snowtrack. Even though it was only about forty yards below the surface, it might as well be four hundred yards below. It was too deep to be seen by a passing helicopter, or even a vehicle as it drove by. Not that any vehicle would. They would think the snowtrack had gone off the marked road, and they would search along the edge of the road. Not way out here, in the middle of the ice field. The road was seventeen miles long. They would spend days searching.

No, Sarah thought. They would never find her.

And even if she could get herself to the surface, what then? She had no compass, no map, no GPS. No radio-it lay smashed beneath her knee. She didn't even know in what direction Weddell Station might be from her present location.

Of course, she thought, she had a bright red parka that would be visible from a distance, and she had supplies, food, equipment-all the equipment that guy had talked about, before they set out. What was it, exactly? She vaguely remembered something about climbing supplies. Crampons and ropes.

Sarah bent down, managed to free herself from a toolbox that had pinned her foot to the floor, and then crawled to the rear of the cab, balancing carefully to avoid the gaping, wide-open door beneath her. In the perpetual twilight of the crevasse, she saw the supply locker. It was crumpled slightly from the impact, and she couldn't get it open.

She went back to the toolbox, opened it, took out a hammer and a screwdriver, and spent the better part of the next half hour trying to pry the locker open. At last, with a metallic screech, the door swung wide. She peered inside.

The locker was empty.

No food, no water, no climbing supplies. No space blankets, no heaters.

Nothing at all.

Sarah took a deep breath, let it out slowly. She remained calm, refusing to panic. She considered her options. Without ropes and crampons, she could not get to the surface. What could she use instead? She had a toolbox. Could she use the screwdriver as an ice axe? Probably too small. Perhaps she could disassemble the gearshift and make an ice axe out of the parts. Or perhaps she could take apart some of the tread and find parts to use.

She had no crampons, but if she could find sharp pointed things, screws or something like that, she could push them through the soles of her boots and then climb. And for a rope? Some sort of cloth perhaps...She looked around the interior. Maybe she could tear the fabric off the seats? Or cut it off in strips? That might work.

In this way, she kept her spirits up. She kept herself moving forward. Even if her chance of success was small, there was still a chance. A chance. chance.

She focused on that.

Where was Kenner? What would he do when he heard the radio message? He probably had, already. Would he come back to Weddell? Almost certainly. And he would look for that guy, the one they thought of as Bolden. But Sarah was pretty sure that guy had disappeared.

And with his disappearance, her hopes for rescue.

The crystal of her watch was smashed. She didn't know how long she had been down there, but she noticed that it was darker than before. The gap above her was not as bright. Either the weather on the surface was changing, or the sun was low on the horizon. That would mean she had been down there for two or three hours already.

She was aware of a stiffening in her body-not just from the fall, but also, she realized, because she was cold. The cab had lost its heat.

It occurred to her that perhaps she could start the motor, and get heat going. It was worth a try. She flicked on the headlights, and one of them worked, glaring off the ice wall. So there was still electricity from the battery.

She turned the key. The generator made a grinding sound. The engine did not kick on.

And she heard a voice yell, "Hey!"

Sarah looked up, toward the surface. She saw nothing but the gap and the strip of gray sky beyond.

"Hey!"

She squinted. Was somebody really up there? She yelled back: "Hey! I'm down here!"

"I know where you are," the voice said.

And then she realized the voice was coming from below below her. her.

She looked down, into the depths of the crevasse.

"Peter?" she said.