Casey stood up at her desk, stretched, looked at her watch. It was ten-fifteen. She'd better get some sleep, she thought. After all, she was going to appear on television tomorrow. She didn't want her mother to call afterward saying, "Dear, you looked so tired..."                                                      

Casey folded up the printout, and put it away.                  

Zero, she thought, was the perfect default value. Because that was what she was coming up with, on this particular night's work.

A big zero.

Nothing.

"A big fat zero," she said aloud. "Means nothing on the line."

She didn't want to think what it meant - that time was running out, that her plan to push the investigation had failed, and that she was going to end up in front of a television camera tomorrow afternoon, with the famous Marty Reardon asking her questions, and she would have no good answers to give him. Except the answers that John Marder wanted her to give.

Just lie. Hell with it.

Maybe that was how it was going to turn out.

You 're old enough to know how it works.

Casey turned out her desk light, and started for the door.

She said good night to Esther, the cleaning woman, and went out into the hallway. She got into the elevator, and pushed the button to go down to the ground floor.

The button lit up when she touched it.

Glowing"1"

She yawned as the doors started to close. She was really very tired. It was silly to work this late. She'd make foolish mistakes, overlook things.

She looked at the glowing button.

And then it hit her.

"Forget something?" Esther said, as Casey came back into the office.

"No," Casey said.

She rifled through the sheets on her desk. Fast, searching. Tossing papers in all directions. Letting them flutter to the floor.

Ron had said the default was zero, and therefore when you got a zero you didn't know if the line was used or not. But if there was a 1 ... then that would mean . . . She found the listing, ran her finger down the columns of numbers:

AUX  1                         00000000000

AUX  2                         00000000000

AUX  3                         00000000000

AUX COA                        01000000000

There was a numeral 1! AUX COA had registered a fault, on the second leg of the flight That meant the AUX COA line was being used by the aircraft.

But what was it used for?

She sucked in her breath.

She hardly dared to hope.

Ron said that AUX COA was a line for Customer Optional Additions. The customer used it for add-ons, like a QAR.

The QAR was the Quick Access Recorder, another flight data recorder installed to help the maintenance crews. It recorded many of the same parameters as a regular DFDR. If a QAR was on this aircraft, it could solve all her problems.

But Ron insisted this plane didn't have a QAR.

He said he'd looked in the tail, which was where it was usually installed on an N-22. And it wasn't there.

Had he ever looked anywhere else?

Had he really searched the plane?

Because Casey knew an optional item like the QAR was not subject to FAA regulation. It could be anyplace in the aircraft the operator wanted it - in the aft accessory compartment, or the cargo hold, or the radio rack beneath the cockpit ... It could be just about anywhere.

Had Ron really looked?

She decided to check for herself.

She spent the next ten minutes thumbing through thick Service Repair Manuals for the N-22, without any success. The manuals didn't mention the QAR at all, or at least she couldn't find any reference. But the manuals she kept in her office were her personal copies; Casey wasn't directly involved in maintenance, and she didn't have the latest versions. Most of the manuals dated back to her own arrival at the company; they were five years old.

That was when she noticed the Heads-Up Display, sitting on her desk.

Wait a minute, she thought. She grabbed the goggles, slipped them on. She plugged them into the CD player. She pressed the power switch.

Nothing happened.

She fiddled with the equipment for a few moments, until she realized there was no CD-ROM in the machine. She looked in the cardboard box, found a silver platter, and slid it into the player. She pressed the power button again.

The goggles glowed. She was staring at a page from the first maintenance manual, projected onto the inside of the goggles. She wasn't quite sure how the system worked, because the goggles were just an inch from her eyes, but the projected page appeared to float in space, two feet in front of

her. The page was almost transparent; she could see right through it.

Korman liked to say that virtual reality was virtually useless, except for a few specialized applications. One was maintenance. Busy people working in technical environments, people who had their hands full, or covered in grease, didn't have the time or inclination to look through a thick manual. If you were thirty feet up in the air trying to repair a jet engine, you couldn't carry a stack of five-pound manuals around with you. So virtual displays were perfect for those situations.. And Korman had built one.

By pressing buttons on the CD player, Casey found that she could scroll through the manuals. There was also a search function, that flashed up a keyboard hanging in space; she had to repeatedly press another button to move a pointer to the letter Q, then A, then R. It was clumsy.

But it worked.

After a moment of whirring, a page hung in the air before her:

N-22

QUICK ACCESS RECORDER (QAR)

RECOMMENDED LOCATIONS

Pressing more buttons, she scrolled through a sequence of diagrams, showing in detail all the places where the QAR could be located on the N-22 aircraft.

There were about thirty places in all.

Casey clipped the player onto her belt, and headed for the door.

AIRPORT MARINA

10:20 P.M.

Marty Reardon was still in Seattle.

His interview with Gates had run long, and he'd missed his plane. Now he was coming down in the morning. Jennifer had to revise the schedule.

It was going to be a difficult day, she realized She'd hoped to start at nine. Now she couldn't begin until ten at the earliest. She sat in the hotel room with her laptop, figuring it out.

9:00-10:00  Transfer from LAX

10:00-10:45  Barker at ofc

11:00-11:30  King at airport

11:30-12:00  FAA at airport

12:15-1:45  Transfer to Burbank

2:00-2:30  Rogers at Burbank

2:30-3:30  Stand-up outside Norton

4:00-4:30  Singleton at Norton

4:30-6:00  Transfer to LAX

Too tight. No time for lunch, for traffic delays, for normal production screwups. And tomorrow was Friday; Marty would want to make the six o'clock plane back to New York. Marty had a new girlfriend, and he liked to spend the weekend with her. Marty would be very pissy if he missed the flight.

And he was definitely going to miss it.

The problem was that by the time Marty finished with Singleton in Burbank, it would be rush hour. He'd never make his plane. He really should leave Burbank by two-thirty. Which meant pushing Singleton up, and holding off the lawyer. She was afraid she'd lose the FAA guy if she changed him at the last minute. But the lawyer would be flexible. He'd wait until midnight if they asked him to.

She'd talked with the lawyer earlier. King was a blowhard, but he was plausible in short bites. Five, ten seconds. Punchy. Worth doing.

9:00-10:00  Transfer from LAX

10:00-10:45  Barker at ofc

11:00-11:30  FAA at airport

11:30-12:30  Transfer to Burbank

12:30-1:00  Rogers at Burbank

1:00-2:00  Stand-up outside Norton

2:00-2:30  Singleton at Norton

2:30-4:00  Transfer to LAX

4:00-4:30  King at airport

5:00-6:00  Pad

That would work. In her mind, she reviewed her pullouts. If the FAA guy was good (Jennifer hadn't met him yet, just talked on the phone), then Marty might run over with him. If it took too long to transfer to Burbank, she'd blow off Rogers, who was weak anyway, and go right to Marty's stand-up. Singleton would be fast - Jennifer wanted to keep Marty moving there, so he didn't attack the woman too much. A tight schedule would help.

Back to LAX, finish with King, Marty'd leave at six, and Jennifer would have her tape. She'd go to an editing bay at the O and O, cut the segment, and uplink to New York that night. She'd call in and get Dick's comments Saturday morning, revise it, and uplink it again about noon. That was plenty of time to make air.

She made a note to call Norton in the morning and tell them she needed to move Singleton up two hours.

Finally she turned to the stack of faxed background documents Norton had sent her office, for Deborah's research. Jennifer had never bothered to look at these, and she wouldn't bother now, except she had nothing better to do. She thumbed through them quickly. It was what she expected -  self-justifying papers that said the N-22 was safe, that it had an excellent record ...

Flipping from page to page, she suddenly stopped.

She stared.

"They've got to be kidding," she said.

And she closed the file.

HANGAR 5

10:30 P.M.

At night, the Norton plant appeared deserted, the parking lots nearly empty, the perimeter buildings silent. But it was brightly lit. Security kept floodlights on all night. And there were video monitors mounted on the corners of all the buildings. As she crossed from Administration to Hangar 5, she heard her footsteps clicking on the asphalt.

The big doors to Hangar 5 were pulled down and locked. She saw Teddy Rawley, standing outside, talking to one of the electrical team. A wisp of cigarette smoke rose up toward the floodlights. She went over to the side door.

"Hey, babe," Teddy said. "Still here, huh?"

"Yeah," she said.

She started through the door. The electrical guy said, "The building's closed. Nobody's allowed in. We're doing the GET now."

"It's okay," she said.

"I'm sorry, you can't," the guy said. "Ron Smith gave strict orders. Nobody's to go inside. If you touch anything on the airplane - "

"I'll be careful," she said.

Teddy looked at her, walked over. "I know you will," he said, "but you're going to need this." He handed her a heavy flashlight, three feet long. "It's dark in there, remember?"

The electrical guy said, "And you can't turn the lights on, we can't have change in the ambient flux - "

"I understand," she said The test equipment was sensitive; turning on the overhead fluorescents might change readings.

The electrician was still fretting. "Maybe I better call Ron and tell him you're going in."

"Call whoever you want," Casey said.

"And don't touch the handrails, because - "

"I won't," she said. "For Christ's sake, I know what I'm doing."

She went into the hangar.

Teddy was right; it was dark inside. She felt, rather than saw, the large space around her. She could barely discern the outlines of the plane, looming above her, all its doors and compartments were open, cabling hanging down everywhere. Beneath the tail, the test box sat in a pool of faint blue light. The CRT screen flickered, as systems were activated in sequence. She saw the cockpit lights go on, then off. Then the forward cabin lights, brightly lit, thirty feet above her. Then darkness again. A moment later, the beacon lights on the wing tips and the tail came on, sending hot white strobe flashes through the room. Then darkness again.

The front headlights suddenly glared brightly from the wing, and the landing gear began to retract. Because the plane was mounted above the ground, the landing gear was free to retract and extend. It would happen a dozen times that night.

Outside the hangar, she heard the electrician, still talking in a worried tone. Teddy laughed, and the electrician said something else.

Casey turned on her flashlight and moved forward. The flashlight cast a powerful glow. She twisted the rim, spreading the beam wider.

Now the landing gear was fully raised. Then the gear doors opened, and the landing gear began to extend, the big rubber wheels coming down flat, then turning with a hydraulic whine. A moment later, the insignia light shone up at the rudder, illuminating the tail. Then it went off again.

She headed for the aft accessory compartment in the tail.

She knew Ron had said the QAR wasn't there, but she felt she had to check again. She climbed the broad stairs rolled up to the back of the plane, being careful not to touch the handrails. Electrical test cables were taped to the handrails; she didn't want to disturb them, or to cause field fluctuation from the presence of her hand.

The aft accessory compartment, built into the upward slope of the tail, was directly above her head. The compartment doors were open. She shone her light in. The upper surface of the compartment was taken up by the underside of the APU, the turbine generator that served as the auxiliary power unit: a maze of semicircular pipes and white couplings wrapped around the main unit. Below was a cramped series of readout meters, rack slots, and black PCS boxes, each with the milled vanes for heat transfer. If there was a QAR in here as well, she might easily miss it; the QARs were only about eight inches square.

She paused to put on her goggles, and turned on the CD player. Immediately a diagram of the aft accessory compartment hung in space before her eyes. She could see through the diagram to the actual compartment behind. The rectangular block marking the QAR was outlined in red on the diagram. In the actual compartment, the space was taken up by an extra readout meter: hydraulic pressure for a flight control system.

Ron was right.

There was no QAR here.

Casey climbed back down the stairs to the floor, and walked beneath the plane to the forward accessory compartment, just behind the nose wheel. It, too, was open. Standing on the ground, she shone her flashlight up into the compartment, and flicked to the correct manual page. A new image hung in the air. It snowed the QAR located in the right anterior electrical rack, next to the hydraulic activator buses.

It wasn't there. The slot was empty, the round connector plug exposed at the back, the shiny metal contact points glinting.

It had to be somewhere inside the plane.

She headed off to the right, where a roll-up staircase led up thirty feet to the passenger door, just behind the cockpit. She heard her feet ring on the metal as she entered the aircraft.

It was dark; she shone her flashlight aft, the beam moving over the cabin. The passenger cabin looked worse than before; hi many places her beam caught the dull silver of the insulation pads. The electrical crews had pulled the ulterior panels around the windows, to get at junction boxes along the walls. She noticed a lingering faint odor of vomit; someone had tried to mask it with a sweet floral spray.

Behind her, the cockpit suddenly glowed. The overhead map lights came on, softly illuminating the two seats; then the row of video display screens, the twinkling lights of the overhead panels. The FDAU printer on the pedestal buzzed, printing out a couple of test lines, then was silent. All the cockpit lights went out

Dark again.

Cycling.

Immediately, the forward galley lights just ahead of her came on; the illuminators for heating and microwaves flashed; the overheat and timer warnings beeped. Then everything went off. Silence.

Dark again.

Casey was still standing just inside the door, fiddling with the CD player at her waist when she thought she heard footsteps. She paused, listening.

It was difficult to tell; as the electrical systems cycled through, there was a continuous succession of soft buzzes and clicks from relays and solenoids in the avionics racks around her. She listened hard.

Yes, she was sure of it now.

Footsteps.

Someone was walking slowly, steadily, through the hangar.

Frightened, she leaned out the door and called loudly, 'Teddy? Is that you?"

She listened.

No more footsteps.

Silence.

The clicking of the relays.

The hell with it she decided. She was up here, alone inside this torn-up airplane, and it was getting on her nerves. She was tired. She was imagining things.

She walked around the galley to the left side, where the display showed an additional electrical storage panel, down near the floor. The panel cover had already been removed. She looked at it through the transparent diagram. This was mostly taken up with secondary avionics boxes, and there was little room...

No QAR.

She moved down the cabin, to the midships bulkhead. There was a small storage compartment here, built into the bulkhead frame, just below a slot for magazines. It was a foolish place to install a QAR, she thought, and she was not surprised when she didn't find one there, either.

Four down. Twenty-six to go.

Now she moved toward the tail, to the aft interior storage compartment. This was a more likely place: a square service panel that was just to the left of the rear exit door, on the side of the aircraft. The panel didn't screw down; it flipped up on a hinge, which made it more accessible for crews in a hurry.

She came to the door, which was open. She felt a cool breeze. Darkness outside: she couldn't see the ground, forty feet below. The panel was just to the left of the door, and it was already open. She looked, seeing it through the diagram. If the QAR was there, it would be in the lower-right corner, next to the breaker switches for the cabin lights and the crew intercom.

It wasn't there.

The wing tip lights came on, brilliant strobes flashing repeatedly. They cast harsh shadows in the interior, through the open door and the row of windows. Then off again.

Clink.

She froze.

The sound had come from somewhere near the cockpit. It was a metallic sound, like a foot kicking a tool.

She listened again. She heard a soft tread, a creak.

Someone was in the cabin,

She pulled the goggles off her head, leaving them hanging around her neck. Silently, she slid to her right, crouching behind a row of seats at the rear of the plane.

She heard footsteps coming closer. A complicated pattern of sound. A murmur. Was there more than one?

She held her breath.

The cabin lights came on, first in front, then midships, then aft. But most of the ceiling lights were hanging, so they cast odd shadows, then went off again.

She gripped the flashlight. The weight felt comforting in her hand. She moved her head to the right, so she could peer between the seats.

She heard the footsteps again, but could see nothing.

Then the landing lights came on, and in their reflected glare, a row of hot ovals appeared on the ceiling, from the windows along both sides. And a shadow, blotting out the ovals, one after another.

Someone walking down the aisle.

Not good, she thought.

What could she do? She had the flashlight in her hand, but she had no illusions about her ability to defend herself. She had her cell phone. Her beeper. Her -

She reached down, and silently flicked the beeper off.

The man was close now. She edged forward, her neck aching, and she saw him. He was almost to the rear of the plane, looking in every direction. She could not see his face, but in the reflected landing lights, she could see his red-checked shirt.

The landing lights went out.

Darkness in the cabin.

She held her breath.

She heard the faint thunk of a relay, coming from somewhere in the forward compartment. She knew it was electrical, but apparently the man in the red shirt did not. He grunted softly, as if surprised, and moved forward quickly.

She waited.

After a while, she thought she heard the sound of footsteps on the metal stairs, going down. She wasn't sure, but she thought so.

The airplane was silent around her.

Cautiously, she came out from behind the seat. It was time to get out of here, she thought. She moved to the open door, listening. There was no question, the footsteps walking away, the sound diminishing. The nose lights came on, and she saw a long streak of shadow. A man.

Walking away.

A voice inside said, Get out of here, but she felt the goggles around her neck, and hesitated. She ought to give the man plenty of time to leave the hangar - she didn't want to go down and find him on the floor. So she decided to look in another compartment.

She pulled on the goggles, pressed the button on the unit. She saw the next page.

The next compartment was nearby, located just outside the rear door, where she was standing. She leaned out the door and, holding on with her right hand, found she could easily look into the panel box. The cover was already open. There were three vertical rows of electrical buses, which probably controlled the two rear doors; they were overrides. And at the bottom...

Yes.

The Quick Access Recorder.

It was green, with a white stripe around the top. Stenciled lettering: MAINT QAR 041/B MAINT. A metal box about eight inches square, with a plug facing outward. Casey reached in, gripped the box, and pulled gently. With a metallic click it came free of the inner coupling. And she had it in her hand.

All right!

She stepped back inside the doorway, holding die box in both hands now. She was so excited she was trembling. This changed everything!

She was so excited, she did not hear the rush of footsteps behind her until it was too late. Strong hands shoved against her, she grunted, and her hands slipped away, and then her body fell through the door, into space.

Falling.

To the floor thirty feet below.

Too soon - much too soon - she felt a sharp pain on her cheek - and then her body landed, but something was wrong. There were strange pressure points all over her body. She was no longer falling, but rising. Then falling again. It was like a giant hammock.

The webbing.

She'd hit the safety webbing.

She couldn't see it in the darkness, but the black safety webbing was hung beneath the plane, and she had fallen into it. Casey rolled over onto her back, saw a silhouette at the door. The figure turned and ran through the airplane. She scrambled to her feet, but it was difficult to balance. The webbing was slowly undulating.

She moved forward, toward the dull metal expanse of the wing. She heard footsteps clattering on the metal stairs, somewhere forward. The man was coming.

She had to get out.

She had to get off the webbing before he caught her. She moved closer to the wing, and then she heard a cough. It had come from the far edge of the wing, somewhere off to her left.

Someone else was here.

Down on the floor.

Waiting.

She paused, feeling the gentle swaying of the webbing beneath her. In a moment, she knew, more lights would come on. Then she could see where the man was.

Suddenly, the hot strobe lights above the tail flickered rapidly. They were so bright, they illuminated the entire hangar.

Now she could see who had coughed.

It was Richman.