It is now a windowless red-brick building, with a blue and white sign outside. HACKNEY PET RESCUE SERVICES. It is depressing to feel your life erased. The kind of depressing that requires you to rest against a wall near the cash machine, causing you to apologise to the old man guarding his PIN number, explaining that you don’t want to rob him, and deal with his stare as if he still isn’t sure.

I watch a man with a Staffordshire terrier leave the building. Then I realise what I can do. How I can make a little peace with my past.

I can cross the street and go inside.

Every other dog in the place is barking. But this one is just lying in its undersized basket. It is a strange grey creature with sapphire eyes. The dog, I feel, is too dignified for such modern garishness, a wolf out of its time. I related.

The dog has an untouched chew toy beside him. A bright yellow rubber bone.

‘What breed is it?’ I ask the dog shelter volunteer (name badge ‘Lou’). She scratches the eczema on her arm.

‘He’s an Akita,’ she says. ‘Japanese. Pretty rare. Bit like a husky, isn’t he?’

‘Yes.’

This is the spot, as far as I can tell. This kennel, this one with this beautiful, sad-looking dog inside, is where the room used to be. The room we slept in.

‘How old is he?’ I ask Lou.

‘Pretty old. He’s eleven. That’s one of the reasons it’s been hard to find a home for him.’

‘And why is he in here?’

‘He was picked up. He was living on a balcony to a flat. Chained up. Horrid state. Look.’ She points at a red-brown scar on his thigh where there is no hair growing.

‘A cigarette burn.’

‘He looks so depressed.’

‘Yep.’

‘What’s his name?’

‘We never knew his name. We call him Abraham.’

‘Why?’

‘The tower block where we found him was called Lincoln Tower.’

‘Ah,’ I said. ‘Abraham. It suits him.’

Abraham stands up. Comes over to me and stares up with those light blue eyes, as if trying to tell me something. I hadn’t intended to get a dog. That hadn’t been part of today’s plan. And yet, here I am, saying, ‘This is the one. I’d like to take him home.’

Lou looks at me in surprise. ‘You don’t want to see the rest?’

‘No.’

I notice the blotched skin on Lou’s arm – crimson and sore – and in my mind it was that cold winter’s day, in Dr Hutchinson’s waiting room, amid the other patients, as I nervously waited for a diagnosis.

London, 1860

There was a blizzard. After a relatively mild and inconsequential spell, during the previous few days in January the temperature had fallen sharply. It was the coldest I had known London to be since 1814, the year of Napoleon jokes and financial scandal and the last Frost Fair, when market traders had sold their wares on the frozen Thames.

As then, to be outside meant to be almost unable to move your face. You could almost feel your blood start to freeze. I could hardly see during my two-mile walk to Blackfriars Road, and my path was guided by the lampposts, those elegant black wrought-iron streetlamps that once seemed so modern. Blackfriars Road was the location of the hospital where Dr Hutchinson was working at the time, the London Cutaneous Institution for Treatment and Cure of Non-infectious Diseases of the Skin. Quite a catchy name, by Victorian standards.

Of course, I didn’t have a disease of the skin. My skin caused me no irritation. I had no rashes. There was nothing wrong with my skin other than that it was two hundred and seventy-nine years old, yet looked centuries younger; but then my whole body felt centuries younger. If only my mind could have felt thirty as well.

The reason I had contacted Dr Hutchinson was because of his work discovering and researching a similar, albeit opposite, affliction known as ‘progeria’.

The word is derived from the Greek words ‘pro’, meaning not only before but also early, and ‘geras’, which means old age. Premature old age. That’s what it is, essentially. A child is born and when they are still a toddler strange symptoms begin to emerge. These symptoms become more startling as the child ages.

The symptoms include those associated with ageing: hair loss, wrinkled skin, weak bones, prominent veins, stiff joints, kidney failure and often loss of eyesight. They die at a young age.

These ill-fated children have always existed. Yet the illness was never recognised until Dr Hutchinson first described it, in relation to a six-year-old boy who was losing his hair and suffering skin atrophy.

So, I was reasonably optimistic on my way to see him. If anyone could help me, he could. You see, I had, in truth, been struggling recently. I had spent most of the last two hundred years searching London and the rest of the country, looking for Marion, occasionally thinking I had seen someone who looked like her, then making a fool of myself. I remember, in particular, the beating I’d received from a drunken cobbler in York on the Shambles, who believed I was propositioning his wife, by asking her when she was born. I played music whenever I could get paid for it, moving on and changing my identity whenever anyone got suspicious. I had never accumulated wealth. The money I had made had always floated through like a draught, being spent on rent and ale.

There were many times I had lost all hope in my search. A search not just for a lost person, but for that other thing I had lost – meaning. For a point. It occurred to me that human beings didn’t live beyond a hundred because they simply weren’t up for it. Psychologically, I mean. You kind of ran out. There wasn’t enough self to keep going. You grew too bored of your own mind. Of the way life repeated itself. How, after a while, there wasn’t a smile or gesture that you hadn’t seen before. There wasn’t a change in the world order that didn’t echo other changes in the world order. And the news stopped being new. The very word ‘news’ became a joke. It was all just a cycle. A slowly rotating downward one. And your tolerance for human beings, making the same mistakes over and over and over and over again, began to fade. It was like being stuck in the same song, with a chorus you had once liked but now made you want to rip your ears off.