“No,” said Petrovitch. They were at the start of the wide-open concourse, and he deliberately slowed down to stay in the crowd. “How does it feel?”

“Reality is imperfect compared to VirtualJapan. It flows, whatever the loading. I haven’t found an upper limit to its bandwidth yet. I don’t know if it even has a limit.” Sorenson gazed at the tower, and was distracted for a moment. “Now, that’s something I could do.” He left without explanation, and Petrovitch watched him make the long walk to the revolving doors. He disappeared from view.

“Hello.”

He spun around. Sonja Oshicora stood in front of him, slightly away from the edge of the pavement. She was almost alone, but was protected by a loose circle of men that now surrounded him, too. The people who walked by on their way to the towers or along the side of the road moved around the circumference: inside was empty but for the two of them.

Most of the Oshicora guards were looking out, but two of them were watching Petrovitch, and they both had their hands inside their jackets. Petrovitch moved his own hands very slowly, so that they were always in view. He made certain that they went nowhere near his bag.

“Hello,” he replied, uncertain of what else to say. Certainly nothing that would prolong the conversation.

She, however, had other ideas. “You do remember me, don’t you?”

“I… I’m not likely to forget.” He watched her tuck her exquisitely cut hair behind her ears and smile with impossibly white teeth.

“It’s good to see you well again,” she said, as if suffering multiple heart attacks was a minor inconvenience. “You are well, aren’t you?”

“Yeah. Fine.” He wanted to run again; away, as fast as he could.

“Good,” she repeated. She talked like she was fey, otherworldly. Compared to Petrovitch, she was. “I understand my father has already thanked you for your actions.”

Again, actions: fleeing through the Metrozone while Ukrainian gangsters tried to kill him. The word didn’t do it justice at all.

“Everything’s settled. No honor debt, no favors owing, nothing. It’s all fine.”

If she noticed his discomfort, she ignored it. “I wanted to thank you myself,” she said. In one step, she was pressing her lips against his. Her breath was warm, tasting of spice, smelling of flowers.

In return, he was rigid with fear. What lasted only a moment seemed to go on forever. He thought he might have another seizure there on the concourse.

She released him, and looked out from under her fringe. Her brown eyes seemed impossibly, animé large.

“Sam,” she said. “I can call you Sam, can’t I?”

“Yeah,” he squeaked. Someone had stolen all his oxygen, and he had a good idea who the culprit was.

“Thank you, Sam.” She smiled again, and that was it; his audience was over. She walked toward the Oshicora Tower, trailing her scent along with her bodyguards, leaving him pale and trembling in the humid, stinking air that blew across the city.

He stood motionless as the bubble of isolation that had surrounded him pricked. Again, he was shoulder to shoulder with the Metrozone. He wondered what Old Man Oshicora would make of it, and hoped that if he was watching, he’d make nothing of it at all.

It was a short walk to the lab. Time, finally, to do some work.

He opened the door slowly, so as not to disturb Pif. She was precisely where he’d left her, crouched over her desk, staring at sheets of minutely detailed equations. If she knew he was there, she made no sign of it.

He threw his bag on his chair, collected her empty mug and rinsed it out using bottled water and his fingers, pouring the brown-stained contents into a pot plant. Then he busied himself making coffee: spooning the granules, boiling the water, stirring and breathing the steam in.

She still hadn’t moved. Even when he delivered the fresh mug to her desk, setting it down exactly on the sticky ring left by the previous brew.

“Pif? Are you catatonic again?”

One eye twitched.

She got like this sometimes, caught up in a recursive math loop that rendered her higher functions incapable of voluntary action. Petrovitch waved his hand in front of her face; her eye twitched faster.

“Yeah, okay. A drop of the hard stuff should sort you out.” He went behind her desk and opened the drawer that contained the bottle of lemon juice. He spilled some into the palm of his hand and brought it close to her nose.

She blinked, made a face, and recoiled.

“Sam,” she said. “How long?”

“No idea. I just got in.”

She stretched extravagantly, and Petrovitch disposed of the juice the same way he’d gotten rid of the coffee dregs. She gave a cry of pain.

“You okay?”

“Pins and needles. I’ll be fine in a minute. Ow ow ow.”

“How you don’t get pressure sores is a miracle.” He wiped his hand on a suitable leaf and used a wet wipe to clear the stickiness away.

“My neck hurts too.”

“You’re not safe to be left on your own.” He pulled out two cellophane-wrapped pastries from his bag. “They’re a bit squashed, but they’re fresh. Ish. At least, I only just bought them.”

“Give me a minute to boot up.” She dug her knuckles into her left thigh and grimaced. “What’s the time?”

“Half eleven.” She clearly expected him to carry on. “On the Tuesday.”

“Good. I thought I’d wasted a whole day.” Pif tried to stand, using her desk for leverage. She wobbled like Bambi, then managed a semblance of upright. “I have good news and bad news.”

Petrovitch passed her a pastry. “Good news, please. My life is so irredeemably pizdets that I can’t cope with anything bad.”

“We haven’t got any competition. I may have been as subtle as a brick casing out the opposition, but we’re in front.”

“Stanford?”

“Out of sight.” She took a few tentative steps and didn’t find them too painful. “Are you sure you don’t want the bad news? I mean, after yesterday, how could it get worse?”

“Well, I was woken up this morning by a desperate American trying to get me to gang up on some very serious Japanese criminals. After breakfast I got picked up by the organitskaya and threatened with not one, but two guns. Then I got kissed by the daughter of the Japanese crime boss right in front of all her bodyguards. To be fair, I haven’t died today, but it’s not even lunchtime yet.”

“I can’t get from the quantum to the classical,” she said.

The gears in Petrovich’s mind spun up to speed. “It didn’t bother Maxwell.”

“Maxwell was a genius standing on the shoulders of other genii. He made a priori assumptions that happened to turn out to be right.”

“He didn’t predict wave-particle duality, or quantum effects.”

“But we can’t ignore them. Can we?” A note of doubt crept into Pif’s voice.

“Yeah. We can. Look at the gravitomagnetic equations. They do just that. And frame dragging works.”

“But… what about chromodynamics?”

Petrovitch reached forward and took one of the sheets of paper from her desk. “You’re doing this ass-backward. You’re trying to mash the electrostrong into gravity and it just won’t work. Well, it might, but remember: it’s supposed to be beautiful, not ugly. This,” he said, shaking the paper, “is ugly. I never liked it. It’s inelegant. What you cooked up yesterday is poetry.”

“If I can’t prove it, it means nothing.” She ripped at the pastry with her teeth, spitting out the cellophane and chewing on what was left.

“Start at the beginning. Ignore everything else. Gravity might not even be part of a theory of everything.”

“It is,” she said, spraying crumbs. “I feel it in my soul.”

“So did Einstein and he took two decades at the end of his life to get precisely nowhere.”

“You said it was poetry.” Pif looked at him reproachfully.

“Ass-backward poetry.” Petrovitch stood in front of the whiteboard with his coffee.