His name was Presley Smith. It was the seventh or eighth time he’d had it, he told me. Each time this phenomenon in his mind began with one persistent thought, a string of words that had no meaning for him. It’s midnight, the lion is out.

—And the rest of this condition? I asked him. —Any thoughts that follow? Pictures, images in the mind? They do come?

He waited, before responding, —Yes, they come scattered-like...not always the same. I forget...A few times the red bumper of an antique car, and part of the fender. I don’t understand them – and why this one thought like a prelude...

—Do you see these words or hear them?

A longish pause. —I don’t know. Hear them, I think.

—Any other phrase or words that follow these?

—No. Just this one.

—You know what it implies – this kind of recurring thought? You came to me, so you appreciate its significance. He nodded, spoke slowly, uncertainly. —Something left over from a previous memory? A life I left behind a long time ago. But I can’t relate to this thought, this image. They are alien.

—That’s how they often come – you don’t understand them. And the trick then is not to try and understand them, unravel the thoughts – that only feeds the syndrome and revives those dead circuits in the brain – and brings more of them back. And you don’t want that.

—No.

I watched him stare away at the window behind me, losing himself; he uncrossed his legs, crossed them back again, returned his gaze to me. The window always had that effect on patients, drawing them out, calming them. On the monitor, hidden from him, Presley’s pulse had already steadied.

I asked, —Do you see in your mind what might be a lion – out stalking, perhaps? Do you have an image of it?

—No.

—Not at all? . . . And midnight – do you see midnight, darkness?

He shook his head, repeated drily, —No.

He was listed as a patient who’d seen two doctors in the city in recent years. Once for a severe attack of Border flu, during the Outbreak three years ago. And then a year ago a consultation with an orthopaedist. I looked up from the monitor.

—Any physical symptoms – racing heart, sweating – to accompany this, er, phenomenon?

—No...But I’m not sure, Doctor.

—What?

—A couple of times I thought...burning...some smoke, meat. I’m not sure. It could be the new neighbours, they like to barbecue.

He grinned sheepishly. But now his pulse had gone up, the fear index risen. This was surprising, the first alarm bell. –And how exactly did it first appear, this thought about the lion out at midnight? Suddenly, full-fledged, or did it approach gradually, begin with a hint, sort of?

—The latter...I think...like an approaching something, it began with a feeling, an expectation, I think. —A certain mood – that feeling?

He nodded quickly.

—A low mood?

—Yes.

Presley Smith had an Afro-head with red hair and pale skin; striking green eyes, planar nose, large ears. A well-done reconstruction job if somewhat eccentric. The average body frame was, I guessed, as before. He would not be an ethnic purist, or an idealist, I surmised from those eclectic features, not someone hung up on history and origins. And he would not be one of those religious fatalists for whom another, perfect life lies somewhere else, in abstraction, why not let this one fade away. A practical man, an everyman named after a twentieth-century pop icon. Then what ails him, I wondered, what demons from his previous life have come to prey upon him, and why? It’s a question we ask ourselves often enough. The answers rarely satisfy, the soft, slimy mass in the head that we call the brain still eludes us, as enigmatic as ever.

Leaked memory syndrome – Nostalgia, as commonly known – is a malady of the human condition in its present historic phase.

Reminders of our discarded lives can not yet be completely blocked, but we can expect their intrusions into our conscious minds to diminish as our understanding of thought-complexes increases and our ability to control them improves.

Chemicals do alleviate the condition, but often they are blunt, their effects diffuse, with collateral outcomes to negotiate. Stubborn cases require the more intrusive ministrations and shock tactics of a surgical team. It was too soon to suggest anything yet. Meanwhile a lifetime of experiences was ready to flood into his brain behind this lion-harbinger that was only a minor irritation now. Was he aware of the danger that lurked ahead, I could not help but wonder. But then that’s what we were there for, the nostalgia doctors, to close the gates behind the scouts and let the past remain hidden.

I noticed that his right knee, crossed over his left, would go off into a steady vibration that he struggled to bring under control, before it set off again. He could easily have had that seen to. On the vibrating leg, in the gap between his black shoes and green pants he revealed a garishly bright yellow sock that periodically flagged my attention. It is these little tics that often are a giveaway, signals from the land of the dead.

They’re all a puzzle, each stray and escaped thought is only the barest tip of a universe that lies beneath. How far do you reach inside to stem the leak? The deeper you dig, the greater the chance of falling into an endless pit – a hazardous operation. It needs a delicate hand to know when to seal off and withdraw; turn off the lights and go home and hope there’s no repair needed in the foreseeable future.

—Have you had previous consultations of this sort? Treatments?

He should not remember them if he had them, and he didn’t.

I prescribed a tranquiliser, and a monitor patch for the arm. If he had an episode, there was a means to signal it, he should on no account dwell on it. We settled for a meeting the following week. I have preferred personal meetings at the beginning of consultations, because with the actual talking person before me, tics and all, I can begin to form my clues about the intruders lurking behind their minds. It is easy and amusing to picture them as so many worms to be captured and put away.

—If it worsens before then – this condition – let me know. —I will. Thanks, Doc.

—Don’t be shy, now.

—I won’t, Doc. Thanks.

He looked surprised at my concern for him, and I felt a blush of embarrassment. We shook hands, and I watched him leave. He had a sturdy profile, with a swaggering walk that did not fit what I had seen of his personality. I kept staring after him, until the clinic manager Lamar’s ample frame filled the doorway suddenly and broke my trance.

—What’s up, Doc?

—Something about this case.

—Oh? What?

I shook my head and sat down. —Let’s see where it goes. He looked disappointed, reminded me to look at a few reports he’d completed, and left.

From as long back as we can imagine, we humans have striven for immortality.

Now that, in our rough and ready way, we’ve begun to approach it, we face the problem of what to do with the vast amount of information we carry. Even if the brain allowed such storage capacity, who would want to be burdened by quantities of redundant, interfering memories? Painful and messy ones?

Therefore as regeneration techniques advanced to allow the body to last longer, mind renewal grew alongside. Th term is colloquial and inaccurate, of course – what is a mind, after all? No matter, as someone quipped. In fact, it’s selected portions of long-term memory that we renew. New memories in new bodies. New lives. That’s the ideal, though we are still far from it. The body may creak and wobble; memory develop a crack or hole. In the leaked memory syndrome, or Nostalgia, thoughts burrow from a previous life into the conscious mind, threatening to pull the sufferer into an internal abyss.

I am myself a GN, a new-generation person – and feel the body-age sometimes, in the nuts and bolts, as it were, the connections and interphases. By law, no record of a person’s past life exists, nor of calendar age, but the body knows. I am old, in the original sense, though the word hardly gets used these days. Surely there’s a little truth to the media hype that we’ve attained the status of ageless gods. A flawed immortality, but we are the fortunate ones, a new species in the making, who’ve defied death. Very nearly.

Our triumph comes, naturally, with its problems. We’ve not created Utopia, perhaps never will. But the problems are old wine in new bottles, we’ve had them always. The war of the generations, as popularly called, or more plainly, the young versus the old, shows no signs of abating; mostly it’s a cold war, manifest in constant disgruntlement. There’s the occasional street riot that vents frustration. The GN-serial rampage two years ago was a terrible exception – eight elderly GNs murdered over a period of twelve months, their bodies savagely mutilated.

The young G0 criminals were apprehended and dealt with. We have assurances from authorities that such acts are very unlikely in the future. We’re not rid of fanatics either – those who will cling to outdated ethnic identities that most of us have forgotten, or for whom longevity is philosophically or morally repugnant. The wide- eyed few who dare to turn off their lights, turn down this gift that we’ve given ourselves. But progress is forward, we cannot go back.

Excerpted with permission from Nostalgia, MG Vassanji, Penguin Books.