Variable

Variable is sitting on my case files again, and I have made my peace with this.

He is a grey-and-white cat of uncertain age, the rescue centre said approximately four years in the confident tone of an institution that knows it's guessing — and he operates with the specific moral framework of someone who has assessed every available hierarchy and placed himself at the top of all of them. He does not move when I put my coffee down next to him. He regards me with one slow blink, which I have decided is affection, and which is almost certainly just indigestion.

"You're on the Hargreaves file," I tell him.

He remains on the Hargreaves file.

It's Thursday. I know it's Thursday because my internal clock doesn't run on days of the week, it runs on momentum, and Thursday has a specific quality of it — end-of-week urgency arriving a day early, that particular gear-shift in the city's rhythm that you can feel through the single-glazed windows of a Victorian tenement on a street off the Royal Mile. Six fifteen in the morning. Edinburgh hasn't fully committed to the day yet. The street below is doing that quiet, tentative thing it does before seven, the city's private version of itself before the tourists and the office workers and the ghost tour guides arrive and it puts its public face on.

I make coffee in the Italian stovetop thing that Clara bought me three years ago when I moved in and that I have been meaning to replace ever since, specifically because it is slow and temperamental and occasionally produces coffee that tastes like it has opinions. It is producing opinionated coffee now. I drink it standing at the window watching the street, the good coat on its hook by the door, the case files in their neat stack on the kitchen table, Variable presiding over them with the gravity of a senior partner.

The morning has a texture I can't quite locate. I woke at ten past six with the absolute conviction that I'd forgotten something, that specific domestic dread, and I've been running through lists in my head, case files, client calls, the dentist appointment I have rescheduled twice, and nothing is missing. Everything is where it should be. The feeling persists anyway, underneath the coffee and the morning and the ordinary machinery of a Thursday.

I file it. I put on the good coat. I go to work.

The firm occupies the second floor of a Georgian building near Broughton, six of us in a room that smells of old carpet and the quiet, specific anxiety of people whose job is to follow other people's lies through the dark and find where they lead. I've been here four years. I am, by most metrics that matter in this profession, very good at what I do. The way I am good at it is difficult to explain to people outside it, and occasionally to people inside it — including Gideon, my boss, who has developed a particular expression he produces when I find something that the standard methodology shouldn't have found, a kind of resigned admiration, like a man who has stopped trying to understand how the magic trick works and has just accepted that it does.

The Carmichael presentation is at ten. Old Edinburgh money, a family trust, six weeks of my time. The fund manager has been skimming for four years through a structure that routes through three shell companies and terminates in a Luxembourg entity called Sunridge Clarity Ltd, which is registered at an address that is, according to satellite imagery, an empty office park on the outskirts of Esch-sur-Alzette. The structure is clever. Not clever enough.

The room goes quiet when I lay it out. Not impressed quiet, afraid quiet, the kind that happens when people who thought they had a manageable problem discover the actual dimensions of the problem they have. I present it without drama because the facts don't need drama. The money moved. I followed the movement. The trail ends where it ends.

"The Luxembourg entity," Gideon says afterward, in the corridor. "There's no direct documentary trail to it from the primary structure."

"There's a timing pattern in the secondary transaction data," I say. "If you map the clearing windows across the three accounts, the gap is consistent. The gap is designed. Someone put it there deliberately, which means someone knows the gap is where you look."

He considers this. "How did you know to look there?"

I think about how to answer this. The honest answer is something like: the money was being held in a direction it didn't want to go, and I followed the pressure until I found what was holding it. The more professional answer is a version of the same thing with better vocabulary. I say: "The resistance in the transaction pattern. I tracked where the flow was being redirected and mapped backwards from the redirection."

He nods slowly, in the way of a man who has accepted that some things resist full explanation and has decided this is one of them. "Right," he says. "Good work."

At lunch, I run.

The route is fixed: up through Holyrood Park, the long pull to Arthurs Seat, the wind coming off the Firth in proper earnest now, November being November. I've run this route so many times that my body does it without my full attention, which is the point — I run to think, or more accurately to stop thinking in the deliberate way and let the thinking that happens underneath have some room. The city drops away as I climb and at the top it's just sky and wind and the Firth glittering below and the sense of being briefly outside all of it.

The bench is halfway down the north face. There is a man on it.

He's been there before. I know this with the specific certainty of having registered something peripheral enough not to consciously process, the same way you know a piece of furniture has moved because the room feels wrong even though you couldn't say exactly why. He's there on Tuesdays and Thursdays, I think. Maybe Saturdays. He's grey-haired, probably sixty, with the build of someone who was once physically substantial and has settled into a quieter version of it. He wears the same dark coat. He has, as far as I've observed, never spoken to anyone.

He watches me run past.

Not in the way that people watch runners, the idle glance, the minor traffic acknowledgement. He watches me with something more specific. The accumulation of familiarity that you're not supposed to have about someone you've never met. I feel it on my back as I pass and it doesn't feel threatening, which is the strange thing. It feels like, I don't have a precise word. Like being in someone's thoughts without knowing it. Like being a sentence in someone's private vocabulary.

I run on. I file it.

Clara meets me for dinner at the Italian place on Leith Walk at half seven. Clara is my best friend in the way that someone can be your best friend when they've known you long enough to have stopped being impressed by the parts of you that impress other people and arrived at something more useful, which is genuine comprehension. She orders the cacio e p**e. She asks about the mountain man from the conference before we've even looked at the menus, which is Classic Clara, who keeps receipts on my romantic life with a dedication I find both touching and faintly alarming.

"He sent a book," I say.

"What kind of book?"

"Academic history. Medieval trade route economics." I pause. "It was correct."

Clara puts down her menu. "Correct how."

"There's a methodology question I raised in the conference presentation. A gap in the Hargreaves approach that I've been working around for two years. He went and found a text that addresses it directly." I pick up my own menu even though I know what I'm having. "He'd have had to know what I was actually saying in the presentation. Not the headline, the argument. And then he'd have had to think about it carefully enough to find the right text, and then he'd have had to source a used copy because it's been out of print since the nineties."

"So he was listening," Clara says.

"He was specifically listening."

She gives me a look. "Veira."

"Don't."

"I'm just noting—"

"Don't note it."

She notes it anyway, silently, with her eyes.

We eat. We talk about her work, her sister's wedding plans, the leak in her bathroom that her landlord is also looking into in the purgatorial way that Edinburgh landlords look into things. I drink one glass of wine. Walking home afterward, the night cold and properly dark now, I feel the Thursday-specific quality of momentum finally winding down, the week's accumulated weight settling, the city around me doing its late-evening thing — quieter, but not quiet, Edinburgh never quite managing quiet.

I turn onto my street.

I stop.

The window on the second floor of the building opposite. I've looked at that building a thousand times. I have never had any particular feeling about it. Tonight I look at it and there is a figure behind the glass, not prominently, not performatively, just standing in the lit room in the way that people stand at windows, and as I stop and look, the figure steps backward, into shadow, with the deliberate economy of someone who is accustomed to not being seen.

I stand on the pavement. The cold comes through my coat. I count three breaths.

Then I tell myself it's nothing, because I am a rational person and this city has seventeen thousand windows and most of them contain people doing entirely unremarkable things, and I go inside.

Behind me, from the second floor of the building opposite, a curtain is still moving. Just slightly. Like something that came to rest a moment too slowly.

Like something that's been watching for a very long time, and tonight, for one second, forgot to be careful.