"But at the very same time, I can look back and remember what it was that I believed was happening when I was insane. And without for one moment ceasing to acknowledge my condition, I still find those memories so convincing . . . "

Thomas's skin crawled. He raised his glass . . . and then put it down. He knew that if he kept on drinking, nothing the man had said would unsettle him in the least -- but he hadn't drunk enough, yet, to be absolutely sure that that was what he wanted.

"If you're not prepared to perform the experiment yourself, at least think about the implications. Imagine that you've modified the way in which you're computed -- and imagine what the consequences would be. A gedanken experiment -- is that too much to ask for? In a sense, that's all I ever performed myself."

The terminal chimed. Thomas took the call. Löhr said, "I have a preliminary report on Paul Durham. Would you like me to read it?"

Thomas shook his head. "I'll view the file."

He skimmed it, at level one detail. Paul Kingsley Durham. Born in Sydney on June 6, 2000. Parents: Elizabeth Anne Maddox and John Arthur Durham . . . joint owners of a delicatessen in the Sydney suburb of Concord, from 1996 to 2032 . . . retired to Mackay, Queensland . . . now both deceased by natural causes.

Educated at a government high school. 2017: Higher School Certificate aggregate score in third percentile; best subjects physics and mathematics. 2018: completed one year of a science degree at Sydney University, passed all examinations but discontinued studies. 2019 to 2023: traveled in Thailand, Burma, India, Nepal. 2024: on return to Australia, diagnosed with an organic delusional syndrome, probably congenital . . . condition partly controlled by medication. Numerous casual laboring jobs until May, 2029. Condition deteriorating . . . disability pension granted January, 2031. Committed to Psychiatric Ward of Blacktown Hospital on September 4, 2035.

Corrective nanosurgery to the hippocampus and prefrontal cerebral cortex performed on November 11, 2045 . . . declared a complete success.

Thomas switched to level two, to fill in the ten-year gap, but found little more than a long list of the drugs, neural grafts, and gene-therapy vectors which had been injected into Durham's skull during that period, to no apparent benefit. There were frequent notes that the treatments had been tested first on a set of partial brain models, but hadn't worked in practice. Thomas wondered if Durham had been told about this -- and wondered what the man imagined happened when a drug was evaluated on fifteen separate models of different regions of the brain, which, taken together, encompassed the entire organ . . .

2046 to 2048: studying finance and administration at Macquarie University. 2049: graduated with first class honors, and immediately hired by Gryphon as a trainee salesman. As of January 17, 2050, working in the Artificial Intelligence Division.

Which meant selling protection, in various guises, to Copies who were afraid that their assets were going to be pulled out from under them. Durham's job description would certainly cover spending long hours as a visitor -- if not quite stretching to matters like disclosing details of his personal psychiatric history, or suggesting metaphysical gedanken experiments to his clients. Or indeed, wasting time on Copies obviously far too secure to need Gryphon's services.

Thomas leaned back from the terminal. It was almost too simple: Durham had fooled his doctors into believing that they'd cured him -- and then, with typical paranoid ingenuity and tenacity, he'd set about getting himself into a position where he could meet Copies, share the Great Truth that had been revealed to him . . . and try to extract a little money in the process.

If Thomas contacted Gryphon and told them what their mad salesman was up to, Durham would certainly lose his job, probably end up in an institution again -- and hopefully benefit from a second attempt at nanosurgery. Durham probably wasn't harming anybody . . . but ensuring that he received treatment was, surely, the kindest thing to do.

A confident, optimistic person would make the call at once. Thomas eyed his drink, but decided to hold off a little longer before drowning the alternatives.

Durham had said: "I understand that everything I believe I've experienced was "due to" my illness -- and I know there's no easy way to persuade you that I'm not still insane. But even if that were true . . . why should it make the question I've raised any less important to you?

"Most flesh-and-blood humans live and die without knowing or caring what they are -- scoffing at the very idea that it should matter. But you're not flesh and blood, and you can't afford the luxury of ignorance."

Thomas rose and walked over to the mirror above the fireplace. Superficially, his appearance was still based largely on his final scan; he had the same unruly thick white hair, the same loose, mottled, translucent eighty-five-year-old skin. He had the bearing of a young man, though; the model constructed from the scan file had been thoroughly rejuvenated, internally, sweeping away sixty years' worth of deterioration in every joint, every muscle, every vein and artery. He wondered if it was only a matter of time before vanity got the better of him and he did the same with his appearance. Many of his business associates were un-aging gradually -- but a few had leaped back twenty, thirty, fifty years, or changed their appearances completely. Which was most honest? Looking like an eighty-five-year-old flesh-and-blood human (which he was not), or looking the way he'd prefer to look . . . prefer to be . . . given the choice. And he did have the choice.

He closed his eyes, put his fingertips to his cheek, explored the damaged skin. If he believed these ruins defined him, they defined him . . . and if he learned to accept a new young body, the same would be true of it. And yet, he couldn't shake the notion that external rejuvenation would entail nothing more than constructing a youthful "mask" . . . while his "true face" continued to exist -- and age -- somewhere. Pure Dorian Gray -- a stupid moralistic fable stuffed with "eternal" verities long obsolete.

And it was good just to feel healthy and vigorous, to be free of the arthritis, the aches and cramps and chills, the shortness of breath he could still remember vividly. Anything more seemed too easy, too arbitrary. Any Copy could become a Hollywood Adonis in an instant. And any Copy could outrace a bullet, lift a building, move a planet from its course.

Thomas opened his eyes, reached out and touched the surface of the mirror, aware that he was avoiding making a decision. But one thing still bothered him.

Why had Durham chosen him? The man might be deluded -- but he was also intelligent and rational on some level. Of all the Copies whose insecurities he might have tried to exploit, why choose one with a watertight setup, secure hardware, a well-managed trust fund? Why choose a target who appeared to have absolutely nothing to fear?

Thomas felt the vertigo returning. It had been sixty-five years. Not one newspaper story or police report had mentioned his name; no database search, however elaborate, could link him to Anna. Nobody alive could know what he'd done -- least of all a fifty-year-old ex-psychiatric patient from the other side of the world.

Even the man who'd committed the crime was dead. Thomas had seen him cremated.

Did he seriously think that Durham's offer of sanctuary was some elaborately coded euphemism for not dredging up the past? Blackmail?

No. That was ludicrous.

So why not make a few calls, and have the poor man seen to? Why not pay for him to be treated by the best Swiss neurosurgeon (who'd verify the procedure in advance, on the most sophisticated set of partial brain models . . .)