"I just have to shut down the system, sir. It'll take a few minutes."

The principal walked to the door, calling, "I expect to see you out there in full gear in fifteen minutes."

"Yessir," responded Jamie Turner, not revealing his huge disappointment at forsaking his machine for a muddy patch of grass and a dozen stupid students.

Alt-F6ing out of the rain forest window, Jamie started to type a status request to see how his Crack-er program was doing on the passcode file. Then he paused, squinted at the screen and noticed something odd. The type on the monitor seemed slightly fuzzier than normal. The letters seemed to flicker too.

And something else: the keys were a little sluggish under his touch.

This was way weird. He wondered what the problem might be. Jamie had written a couple of diagnostic programs and he decided he'd run one or two of them after he'd extracted the passcode. They might tell him what was wrong.

He guessed the trouble was a bug in the system folder, maybe a graphics accelerator problem. He'd check that first.

But for a brief instant Jamie Turner had a ridiculous thought: that the unclear letters and slow response times of the keys weren't a problem with his operating system at all. They were due to the ghost of a long-dead Indian, floating in between Jamie and his machine, angry at the human presence as the spirit's cold, spectral fingers keyed in a desperate message for help.

At the top left-hand corner of Phate's screen was a small dialogue box containing this:

Trapdoor – Hunt Mode

Target: JamieTT6hol.com

Online: Yes

Operating system: MS-DOS/Windows

Antivirus software: Disabled

On the screen itself Phate was looking at exactly what Jamie Turner was seeing on his own machine, several miles away, in St. Francis Academy.

This particular character in his game had intrigued Phate from the first time he'd invaded the boy's machine, a month ago.

Phate had spent a lot of time browsing through Jamie's files and he'd learned as much about him as he'd learned about the late Lara Gibson.

For instance:

Jamie Turner hated sports and history and loved math and science. He read voraciously. The youngster was a MUDhead – he spent hours in the Multiuser Domain chat rooms on the Internet, excelling at role-playing games and active in creating and maintaining the fantasy societies so popular in the MUD realm. Jamie was also a brilliant codeslinger – a self-taught programmer. He'd designed his own Web site, which had gotten a runner-up prize from Web Site Revue Online. He'd come up with an idea for a new computer game that Phate found intriguing and that clearly had commercial potential.

The boy's biggest fear was losing his eyesight; he ordered special shatterproof glasses from an online optometrist.

The only member of his family he spent much time e-mailing and communicating with was his older brother Mark. Their parents were rich and busy and tended to respond to every fifth or sixth e-mail their son sent.

Jamie Turner, Phate had concluded, was brilliant and imaginative and vulnerable.

And the boy was also just the sort of hacker who'd one day surpass him.

Phate – like many of the great computer wizards – had a mystical side to him. He was like those physicists who accept God wholeheartedly or hard-headed politicians who're devoutly committed to Masonic mysticism. There was, Phate believed, an indescribably spiritual side to machines and only those with limited vision denied that.

So it wasn't at all out of character for Phate to be superstitious. And one of the things that he'd come to believe, as he'd used Trapdoor to stroll through Jamie Turner's computer over the past few weeks, was that the boy had the skill to ultimately replace Phate as the greatest codeslinger of all time.

This was why he had to stop little Jamie T. Turner from continuing his adventures in the Machine World. And Phate planned to stop him in a particularly effective way.

He now scrolled through more files. These, which had been e-mailed to him by Shawn, gave detailed information about the boy's school – St. Francis Academy.

The boarding school was renowned academically but, more important, it represented a true tactical challenge to Phate. If there was no difficulty – and risk to him – in killing the characters in the game then there was no point in playing. And St. Francis offered some serious obstacles. The security was very extensive because the school had been the scene of a break-in several years ago in which one student had been killed and a teacher severely wounded. The principal, Willem Boethe, had vowed to never let that happen again. To reassure parents, he had renovated the entire school and turned it into a fortress. Halls were locked down at night, the grounds double-gated, windows and doors alarmed. You needed passcodes to get in and out of the tall razor-wired wall surrounding the compound.

Getting inside the school was, in short, just the right kind of challenge for Phate. It was a step up from Lara Gibson – moving to a higher, more difficult level in his game. He coulda-

Phate squinted at the screen. Oh, no, not again. Jamie's computer – and therefore his too – had crashed. It'd happened just ten minutes ago too. This was the onebug in Trapdoor. Sometimes his machine and the invaded computer would simply stop working. Then they'd both have to reboot – restart – their computers and go back online.

It resulted in a delay of no more than a minute or so but to Phate it was a terrible flaw. Software had to be perfect, it had to be elegant. He and Shawn had been trying to fix this bug for months but had had no luck so far.

A moment later he and his young friend were back online and Phate was browsing through the boy's machine once more.

A small window appeared on Phate's monitor and the Trapdoor program asked:

Target subject has received an instant message from

MarkTheMan. Do you want to monitor?

That would be Jamie Turner's brother, Mark. Phate keyed Yand saw the brothers' dialogue on his screen.

MarkTheMan: Can you instant message?

JamieTT: Gotta go play sucker I mean SOCCER.

MarkTheMan: LOL. Still on for tonight?

JamieTT: You bet. Santana RULES!!!!!

MarkTheMan: Can't wait. I'll see you across the street

by the north gate at 6:30. You ready to rock n roll?

Phate thought, You bet we are.

Wyatt Gillette paused in the doorway and felt as if he'd been transported back in time.

He gazed around him at the California State Police Computer Crimes Unit, which was housed in an old one-story building several miles from the state police's San Jose headquarters. "It's a dinosaur pen."

"Of our very own," Andy Anderson said. He then explained to Bishop and Shelton, neither of whom seemed to want the information, that in the early computing days huge computers like the mainframes made by IBM and Control Data Corporation were housed in special rooms like this, called dinosaur pens.

The pens featured raised floors, beneath which ran massive cables called "boas," after the snakes, which they resembled (and which had been known to uncurl violently at times and injure technicians). Dozens of air conditioner ducts also criss-crossed the room – the cooling systems were necessary to keep the massive computers from overheating and catching fire.

The Computer Crimes Unit was located off West San Carlos, in a low-rent commercial district of San Jose, near the town of Santa Clara. To reach it you drove past a number of car dealerships – EZ TERMS FOR YOU! SE HABLA ESPANOL – and over a series of railroad tracks. The rambling one-story building, in need of painting and repair, was in clear contrast to, say, Apple Computer headquarters a mile away, a pristine, futuristic building decorated with a forty-foot portrait of cofounder Steve Wozniak. CCU's only artwork was a broken, rusty Pepsi machine, squatting beside the front door.