A Partial Match

June left because I asked her to, and Callum stayed because I did not ask him anything, and Detective Sefi Okafor sat down on an upturned fish box across the bench from me with her wet coat steaming faintly in the stove heat, and for a long moment neither of us said a word, two women looking at each other across a plank of half-clenched copper nails, taking the true measure that voices get in the way of. She had a good face for her trade, a face that gave you nothing and forgave you everything, and eyes with an old tiredness banked behind them like a fire kept in overnight. I had spent two weeks learning to read hunters. She was not one. I have thought a long time about what she was instead, and the nearest I can get is this: she was what the law would look like if the law had ever once been a woman standing at the wrong man's door.

"You knew my voice," she said. "From the message. I wondered if you'd kept it."

"I kept everything. The dead can't afford to throw things away."

"No," she said. "They can't. Which is roughly what I'm here about." She reached into the coat, unhurried, both movements shown, the way you move around a nervous animal or a person who has recently been handed cards by strangers, and what she set on the bench between us was a photograph of a tin. Green marine antifouling, the chandler's own stock, sitting on an evidence table under a scale bar. "Three days ago somebody left this on your stair. You didn't report it. The chandler mentioned it to his wife, his wife cleans for Mrs. Fanshawe, and Mrs. Fanshawe has decided I'm a customs inquiry, which suits us both. I recovered the tin from your half-landing yesterday while you were down here. You'll forgive the trespass. I've been careful about whose fingers I put where, which is more than I can say for the woman who bought it."

"You have her prints."

"I have her thumb," Okafor said. "On the underside of the rim, where a person grips to set a thing down gently. One good thumb. And here is where I stop being a detective making a report and start being what I actually am, which is a woman a long way off her own ground, alone, on leave that my superintendent believes is compassionate." She turned the photograph face down, as if the tin had heard enough. "I ran that thumb. Not through the front door, I haven't used a front door since your husband's firm noticed me. There's a partial match. Not to anyone with a record. To another evidence file. A closed one. Eleven years closed." Her voice did not change, which was how I knew we had arrived at the reason she had driven two hundred miles on her own money. "A woman drowned at a spring tide off a bar very like the one out there. Her car at a notorious edge. A coat folded. The verdict said accident, the file said nothing at all, and the same thumb that set your tin down was on the inside of that woman's door handle, and it bothered nobody, because the case was closed by teatime and the grieving family was very grateful, and there was a sister. There is always," she said, "a sister."

The stove ticked. Callum had gone very still by the workshop door, a plane in his hand he had forgotten he was holding.

"Say her name," I said. "The woman."

"Marin," Okafor said, and watched me not recognise it, and nodded slowly to herself as if a column had come out even. "You don't know it. But somebody in your life does, because eleven years ago somebody helped Marin disappear, and it went wrong in exactly the shape your life is currently the shape of. I sat in my car last night and put it in a straight line for the first time and nothing in that file had done to me what the straight line did. These are not people hunting you, Vivian. These are people who hunt your kind. The falsely dead. They find the women the sea supposedly took, and they give them back to it, properly, at a deep tide, and the beauty of it is that the file was already closed before they ever lift a finger. You died three weeks ago two hundred miles south. When they drown you on Thursday, no one will even open a folder. You cannot murder a woman who is already dead. It is the only perfect crime I have ever seen, and I have been looking at imperfect ones for twenty years."

I had thought I understood my own danger. I had counted it in tides and carried it steadily, my hand doing its backwards trick. But hearing the machine of it laid out in that level voice, the file already closed, the folder that would never open, I felt the cold go through me in a new place, because she was right, and it was worse than being hunted. Being hunted means somebody must catch you. This only needed me delivered, once, to water, on a date the moon had already published.

"You said partial," Callum said from the door. His voice came out planed flat. "A partial match. What's that worth in front of a judge?"

"On its own, nothing," Okafor said, without turning. "A partial is a maybe. A maybe eleven years old, from a file a coroner already signed. If I arrest that woman tonight for buying paint and trespassing on a stair, she is out by morning and gone by noon, and next year, or the year after, when everyone has relaxed, a very patient couple arrives in whatever town you've run to next, and I am too old to keep finding you first." She turned to him then, and I saw she had taken the whole measure of what he was to me and decided to speak to it straight. "The only charge that ends this is the one that has a living woman on one end of it and their hands on the other. In the act. In daylight or in dark, but in the act, with me close enough to swear to it."

"You're talking about using her as bait," Callum said.

"I'm talking about the tide choosing the hour whatever we do," Okafor said, "and the only question being who else is standing in the water when it turns." Then she looked back at me, and the tiredness banked behind her eyes came up a little, like a fire found air. "I want to be exact with you, because you have had eight years of people being inexact with you on purpose. If I do this by the book, I report you alive today. The fraud comes first, the inquest reopens, your husband's lawyers are on the road north by dark, and the patient people melt away and wait for the next town. Everything the book knows how to do returns you to the house you died escaping, and calls it order. So I am not doing it by the book. I am on leave. I am a private woman standing in a boatyard, and what I know today I have written down and posted to nobody." She let that sit. "I will keep you dead, Vivian Roost. As long as it takes and longer than I should. In exchange I want the truth from you, all of it, from the brakes forward, because I cannot catch what I cannot predict, and these people have had a fortnight's start on me and eleven years' practice."

"Why," I said. It came out quieter than I meant. "You know what keeping me dead costs you if it goes wrong. Your warrant card. Maybe worse, given whose wife I am. Nobody spends that on a stranger. So before I give you the truth, you'll give me yours. Why."

For a moment I thought she would hand me something arranged. I watched her consider it, the way the practised do, and I watched her put it down, and what she said instead had the specific weight of a thing being lifted off a shelf where it had stood a long time.

"Because I have watched money close a file with a woman inside it once before," she said, "and I was twenty-six, and I let it happen, and I have been on my way back to that file by one road or another for twenty years. You're not her. But you're the door the world has finally left open onto the same room." She stood, coat creaking, business returning to her voice like weather coming back in off the sea. "That's as much of me as is useful to you. Now. The truth, from the brakes. We have two tides of quiet left, and I intend to spend them learning your enemies faster than they learned you."

So I told her. All of it, at the bench, with Callum stood in the doorway hearing the shape of what I had promised him whole, the corner and the cut line and the Throat, Nadia and the folded coat and the one shoe, the green tube I could not stop myself signing the scene with, the £11,000 and the emptied account, the tin, the cards, the cologne, the vault red, Celeste's offer, the courier's kindness. It took the whole grey afternoon. Okafor wrote nothing down, which I understood was itself a kind of oath, and when it was done she sat in silence for a long minute, arranging it all behind her steady face, and then she said the thing that ended the day's last quiet.

"There's one more piece, and I'd rather you had it from me tonight than from the town tomorrow. Yesterday morning, on the front, while you stood answering a dead man's cologne, a man with a pram took a photograph of the harbour and put it on the internet, the way people do, for nothing, for the light. You are in the left of it. Half profile, hood down. I found it in four hours, running searches with one hand from a room over a bakery." She held my eyes, low and unhurried and already sorry. "Your husband's firm owns twelve hundred people and the best matching software in Europe, and it has been running your face without rest for three weeks."