He is riding the Harley so slowly that he would certainly fall over if not for the sidecar. Occasionally he gooses it forward with a flick of the fingers on his clutch hand.

Maybe one reason he looks so big - other than the fact that he really is big - is the fact that he appears totally neckless. His head starts out wide and just keeps getting wider until it merges with his shoulders. At first Hiro thinks it must be some kind of avant-garde helmet. But when the man rolls past him, this great shroud moves and flutters and Hiro sees that it is just his hair, a thick mane of black hair tossed back over his shoulders, trading down his back almost to his waist.

As he is marveling at this, he realizes that the man has turned his head to look back at him. Or to look in his general direction, anyway. It's impossible to tell exactly what he's looking at because of his goggles, a smooth convex shell over the eyes, interrupted by a narrow horizontal slit.

He is looking at Hiro. He gives him the same fuck-you smile that he sported earlier tonight, when Hiro was standing in the entryway to The Black Sun, and he was in a public terminal somewhere.

This is the guy. Raven. This is the guy that Juanita is looking for. The guy Lagos told him not to mess with. And Hiro has seen him before, outside the entrance to The Black Sun. This is the guy who gave the Snow Crash card to Da5id.

The tattoo on his forehead consists of three words, written in block letters: POOR IMPULSE CONTROL.

Hiro startles and actually jumps into the air as Vitaly Chernobyl and the Meltdowns launch into their opening number, "Radiation Burn." It is a tornado of mostly high-pitched noise and distortion, like being flung bodily through a wall of fishhooks.

These days, most states are franchulates or Burbclaves, much too small to have anything like a jail, or even a judicial system. So when someone does something bad, they try to find quick and dirty punishments, like flogging, confiscation of property, public humiliation, or, in the case of people who have a high potential of going on to hurt others, a warning tattoo on a prominent body part. POOR IMPULSE CONTROL. Apparently, this guy went to such a place and lost his temper real bad.

For an instant, a glowing red gridwork is plotted against the side of Raven's face. It rapidly shrinks, all sides converging inward toward the right pupil. Raven shakes his head, turns to look for the source of the laser light, but it's already gone. Lagos has already got his retinal scan.

That's why Lagos is here. He's not interested in Hiro or Vitaly Chernobyl. He's interested in Raven. And somehow, Lagos knew that he was going to be here. And Lagos is somewhere nearby, right now, videotaping the guy, probing the contents of his pockets with radar, recording his pulse and respiration.

Hiro picks up his personal phone. "Y.T.," he says, and it dials Y.T.'s number.

It rings for a long time before she picks it up. It's almost impossible to hear anything over the sound of the concert.

"What the fuck do you want?"

"Y.T., I'm sorry about this. But something's going on. Something big time. I'm keeping one eye on a big biker named Raven."

"The problem with you hackers is you never stop working."

"That's what a hacker is," Hiro says.

"I'll keep an eye on this Raven guy, too," she says, "sometime when I am working." Then she hangs up.

Raven makes a couple of broad, lazy sweeps along the perimeter of the crowd, going very slowly, looking in all directions. He is annoyingly calm and unhurried.

Then he cuts farther out into the darkness, away from the crowd. He does a little more looking around, checking out the perimeter of the shantytown. And finally, he swings the big Harley around in a trajectory that brings him back to the big important Crip. The guy with the sapphire tie clip and the personal security detail.

Hiro begins weaving through the crowd in that direction, trying not to be too obvious about it. This looks like it's going to be interesting.

As Raven approaches, the bodyguards converge on the head Crip, form a loose protective ring around him. As he comes nearer, all of them back away a step or two, as though the man is surrounded by an invisible force field. He finally comes to a stop, deigns to put his feet on the ground. He flicks a few switches on the handlebars before he steps away from his Harley. Then, anticipating what's next, he stands with his feet apart and his arms up.

One Crip approaches from each side. They don't look real happy about this particular duty, they keep casting sidelong glances at the motorcycle. The head Crip keeps goading them forward with his voice, shooing them toward Raven with his hands. Each one of them has a hand-held metal-detecting wand. They swirl the wands around his body and find nothing at all, not even the tiniest speck of metal, not even coins in his pocket. The man is 100 percent organic. So if nothing else, Lagos's warning about Raven's knife has turned out to be bullshit.

These two Crips walk rapidly back to the main group. Raven begins to follow them. But the head Crip takes a step back, holds both of his hands up in a "stop" motion. Raven stops, stands there, the grin returning to his face.

The head Crip turns away and gestures back toward his black BMW. The rear door of the BMW opens up and a man gets out, a younger, smaller black man in round wire-rims, wearing jeans and big white athletic shoes and typical studentish gear.

The student walks slowly toward Raven, pulling something from his pocket. It's a hand-held device, but much too bulky to be a calculator. It's got a keypad on the top and a sort of window on one end, which the student keeps aiming toward Raven. There's an LED readout above the keypad and a red flashing light underneath that. The student is wearing a pair of headphones that are jacked into a socket on the butt of the device.

For starters, the student aims the window at the ground, then at the sky, then at Raven, keeping his eye on the flashing red light and the LED readout. It has the feel of some kind of religious rite, accepting digital input from the sky spirit and then the ground spirit and then from the black biker angel.

Then he begins to walk slowly toward Raven, one step at a time. Hiro can see the red light flashing intermittently, not following any particular pattern or rhythm.

The student gets to within a yard of Raven and then orbits him a couple of times, always keeping the device aimed inward. When he's finished, he steps back briskly, turns, and aims it toward the motorcycle. When the device is aimed at the motorcycle, the red light flashes much more quickly.

The student walks up to the head Crip, pulling off his headphones, and has a short conversation with him. The Crip listens to the student but keeps his eyes fixed on Raven, nods his head a few times, finally pats the student on his shoulder and sends him back to the BMW.

It was a Geiger counter.

Raven strolls up to the big Crip. They shake hands, a standard plain old Euro-shake, no fancy variations. It's not a real friendly get-together. The Crip has his eyes a little too wide open, Hiro can see the furrows in his brow, everything about his posture and his face screaming out: Get me away from this Martian.

Raven goes back to his radioactive hog, releases a few bungee cords, and picks up a metal briefcase. He hands it to the head Crip, and they shake hands again. Then he turns away, walks slowly and calmly back to the motorcycle, gets on, and putt-putts away.

Hiro would love to stick around and watch some more, but he has the feeling that Lagos has this particular event covered. And besides, he has other business. Two limousines are fighting their way through the crowd, headed for the stage.