The histology came back at nine o'clock on Tuesday night, and it said exactly what he had known it would say.

Elias sat at the microscope in the bare white light of the lab, with one eye pressed to the lens and the other closed, and looked at the thin pink ribbon of tissue that had once been the inside of Rebecca Hale's left arm. It was a good slide. He had cut it himself, very thin, and stained it with the care he gave to all the things that mattered. Under the glass the cells lay in their orderly rows, pale and rounded and quiet. And running through them, in a dark irregular band, were the red cells that should not have been there.

Extravasated blood. Inflammatory infiltrate. The first faint swelling of a body that had tried, in its last minutes, to heal.

She had been alive when the hand closed on her arm.

He sat back. The lab was silent around him. Wade had gone home at six, with a long uncertain look at the pale figure at the bench and a murmured promise to return early. The refrigeration units breathed in the corner. Upstairs, on the third floor, a light was burning in a glass-fronted office, and a man in shirtsleeves was bent over a stack of files. Elias knew it. He had seen the glow of it from the car park an hour ago, a small gold window high in the dark face of the building.

I will be late, he had said, at five. Do not wait for me.

I will not, Luke had said. I will only work.

It was the lie of two people who understood each other perfectly. They had parted at the foot of the stairs, with nothing more said, and the whole long evening had passed in the quiet certainty that neither of them would be the first to go home.

He took the slide from the stage, and laid it in its box, and shut the lid.

It was proof, of a kind. A pathologist could stand in a courtroom and say that this bruise had been made in life, by a force consistent with a hand, and the jury would nod. But it was not proof of whose hand. A defense attorney would rise, mild and courteous, and ask the Doctor whether he could say who had held that arm. Whether it might not have been a friend, a colleague, a stranger on the stairs. Whether a woman who had been so very distressed might not have gripped herself.

No. He could not say.

He sat very still, with his gloved hands folded on the bench. A drop of water fell from the tap into the steel sink, and the sound went out into the quiet and did not come back.

He thought of Greg Hale.

He had seen him only once, at a distance, in the lobby of the hospital on Monday afternoon: a big, soft, sandy man in a rumpled gray suit, with red-rimmed eyes and a face collapsed by grief. He had been weeping. He had clutched the hands of the nurses who came to console him. He had said, in a voice that carried across the polished floor, that he did not know what he would do. That she had been everything. That he could not understand why she had not told him she was so unhappy. The nurses had wept with him, and the desk clerk had wiped her eyes, and a social worker had put an arm around his shoulders.

It had been a perfect performance.

Elias had stood at the edge of the hall and watched it with the cold, specific attention of a man who knew what grief looked like, in all its forms, and had spent a lifetime learning to tell it from imitation. And a small, steady voice in the back of his mind had said: he is not weeping for her.

He did not know how he knew. It was nothing in the face. It was in the rhythm of it, the faint calculated timing. A man in real grief did not look to see who was watching.

But he could not say that to a jury.

Ten past ten. He rose from the bench and went to the cold room, and drew out the drawer, and stood for a long time looking down at the quiet face.

It was the third time in a fortnight.

He knew it as he knew his own pulse. Frank Lowry on the sixth. Warren Kray on the tenth. And now this one, on the twentieth. Three times in fourteen days, when he had once gone a month without. After Kray he had lain in a hospital bed with a core temperature of ninety-one and a heart that would not settle, and the doctors had told him in careful voices that his body was not behaving as a body should. They had said, we do not understand it. They had said, you must rest.

He had not rested. He had gone back to work on the Monday. And in the ten days since, the chill in his bones had never fully lifted. It had retreated a little, in the warm bed in the tower, in the steam of the morning tea. But it lay always at the bottom of him, a layer of ice beneath a thin skin of warmth, and he did not know how much more it would bear.

He thought: you are going to hurt yourself.

He thought, quite clearly: she was afraid of heights.

There was a woman who had come down eleven flights of stairs rather than ride a glass elevator. And a man had taken her by the arms in the half-dark and walked her backward to a rail, and let go. She had had perhaps four seconds. She had gone through them alone, with nobody to say her name. And somewhere in the city, a man in a gray suit was sitting up late with a social worker and a cup of tea, being comforted.

He closed his eyes.

"I am sorry," he said aloud, to the woman in the drawer. "I do not think I can bear to leave it."

He went to the sink.

He washed for three minutes. He did it more slowly than usual, with a kind of ritual attention, as if each stroke of the brush were a word in a very old prayer. He dried each finger. He took the nitrile gloves from the box and drew them on, and then the black leather, and smoothed each cuff with his thumb from the center outward. He took up the third pair, the disposable ones, and held them for a moment, and put them down again. He would not need them.

He drew the sheet from the arm.

She lay as he had left her, quiet and gray under the hard light, with the small silver cross still at her throat. The marks on the inside of her arm were dark against the pallor, eight oval stains in two neat rows. He bent over them. He studied them for a moment, the spacing and the shade, the faint blurred rim.

Then he began to undress his left hand.

The disposable glove had not been put on, so there was only the leather. He drew it from the first finger, and the second, and the third, working it down over the knuckles with the slow care of a man peeling away a skin. It came away in his palm, warm and soft and dark, and he laid it carefully on the edge of the steel table, with its fingers pointing toward the wall. Then the nitrile. He rolled it back, from the wrist, and let it fall.

His bare hand lay open in the light.

It was a long, pale, narrow hand, with fine bones and a pale scar across the base of the thumb. It trembled. He watched it tremble, and did not try to stop it. It lay in the air above the dead woman's arm like a bird that has come to rest on a branch and is not quite sure of its footing.

"Forgive me," he said.

He laid it on the bruise.

For a moment there was nothing. Only the cold, the smooth, waxy chill of skin that had lain in a drawer for two days. Then a slow dark ringing began somewhere behind his eyes, and the lab slid sideways, and the white light went out like a candle blown flat.

Sixty.

She is tired. That is the first thing. It is a quarter past three in the morning, and she has been on her feet for eleven hours, and her shoes hurt, and the ICU has been bad tonight, a boy of nineteen who did not wake up. She has gone out onto the fourth-floor landing to breathe. It is the one place in the building where nobody comes. The air in the stairwell is cold and smells of dust. She stands with her back against the wall and her eyes closed and thinks about the dress.

Fifty-one.

It is gold. Not yellow, gold, the color of the inside of a shell, and she found it in a shop on Alder Street in March, and Hannah cried when she saw her in it. The wedding is in May. The hall has been booked since August. She has a binder with eleven tabs. She is going to cry all through the ceremony. She has already decided.

The door opens.

Forty-four.

"Becca."

She knows the voice. She knows it better than she knows her own. He is standing in the doorway, in his gray coat, with the stairwell light on his sandy hair, and his face is white. He has come in behind a night nurse who was going out. He has not called. He has not texted. He is simply here, as he sometimes is, at the end of a long shift, with a flask of coffee. But he has no flask tonight. And his eyes have a look she has never seen.

"Greg? What are you..."

"We need to talk."

Thirty-eight.

He tells her. He says it quickly, stumbling, the words crowding over each other like frightened animals. He says that she must not be angry. He says it was only a loan. It was nothing, a bridge, until the business turned around. He says he signed her name on the form because there was no time, and it was only a formality, and the premium was small. Four hundred thousand. He says the number as if it were a prayer.

She does not understand. Then she does.

"You took out a policy on me."

"It was for us."

"You forged my signature."

"Becca, please."

Thirty.

She is shaking. It starts in her hands, and spreads. She has known for a month that something was wrong, a coldness at the dinner table, a creditor's letter slipped under the mail, and she has told herself that it would pass. She has told herself that he is a good man. He has been a good man for sixteen years. He taught Hannah to ride a bicycle.

"I'm going to tell Michael," she says. Her voice is very small. "My brother. He's a lawyer. I'm going to tell him tonight."

"No."

"I have to."

"Becca, no."

Twenty-two.

His hands close on her arms.

It does not hurt, at first. It is only the shock of it, the heat, the sudden weight. He holds her above the elbows, on the soft inside of each arm, and his thumbs press into the flesh, and he is looking into her face with a kind of terrible pleading. He is saying her name. He is saying it over and over, quickly, like a man trying to catch a falling thing. And then he is walking her backward.

Seventeen.

She tries to turn. She cannot. The railing is against the small of her back, cold and hard, and she can feel the long drop behind her, a hollow breath of air rising from the dark. She has never been able to look down. She has never once, in thirty-four years, been able to look down.

"Greg," she says. "Greg. Please. I'm afraid."

Eleven.

For a moment, he does not move.

She sees it. She sees it in his face, quite clearly, in the yellow light of the landing. A change. A stillness, like water freezing. The pleading is gone. The panic is gone. In its place is something level and calm and terrible, the look of a man who has stood at the edge of a thing for a long time and has finally been given the permission to step.

His hands tighten.

Six.

He pushes.

It is not a violent thing. It is almost gentle. A single firm shove, and the rail goes out from behind her, and the floor, and the whole world. She falls backward into the dark with her arms flung wide. She sees the ceiling go by, and the caged bulb, and the white face of the man above her, looking down.

He is not weeping. He is watching.

Three.

She thinks of the dress.

Gold. The color of the inside of a shell.

Zero.

Elias came back to himself with a cry.

He did not know that he had made it. He knew only that he was no longer on his feet, that the floor had come up to meet him, that the cold was inside him like a knife. He lay on his back on the tiles. Above him the white panels of the ceiling swung slowly in and out of focus. His bare hand lay palm up at his side, and the fingers, when he tried to move them, would not obey.

It was worse than before.

He knew it at once. It was worse than the cold room, worse than the lab floor, worse than anything. It was not a chill, it was a stillness, a vast deep heavy silence, spreading from the center of his chest outward like frost across a pane. His heart was slow. It labored, like a swimmer's heart in cold water, and each beat seemed to take a very long time to arrive. His lips felt thick. His teeth were chattering so hard that he could hear them in his skull, a dry, rapid, mechanical clatter, and under the clatter, somewhere far down, a faint small voice was saying, this is not good, this is not good.

He tried to sit up. He could not.

He lay and looked at the ceiling.

He thought: it was Greg.

It was a bright, clear, hard thought, like a stone on black water. He had seen it. He had been in the dead woman's skin, and looked out through her eyes, and watched a man's face change. He knew now, beyond any possibility of doubt, who had put his hands on her arms. He knew the color of the coat. He knew the pleading, and the number, and the word forged. He knew the exact instant at which a husband became a murderer, and it was not a moment of rage. It was a moment of rest.

He is not weeping. He is watching.

He rolled onto his side.

It took a very long time. His body felt like something that belonged to someone else, heavy and slow and thick with ice. He got one elbow under him, and then the other, and for a while he lay on the cold floor on his stomach, with his cheek against the tile and his breath coming in short sharp pulls, and waited for the room to stop turning.

Phone. He had to get to the phone.

It lay on the desk, thirty feet away, a small black rectangle on the edge of the blotter. He fixed his eyes on it. He began to crawl.

It was the longest distance he had ever traveled. He dragged himself across the tile with his one gloved hand and his one bare one, inch by inch, leaving behind him a faint damp smear, and the lab swam around him in great slow waves. He stopped. He started. He counted. Ten inches. Eleven. His heart lurched. Fifteen. A great hollow darkness was gathering at the edges of his sight. At twenty-two he stopped, and laid his forehead against the floor, and could not go on.

He could see the phone.

It was eight feet away. He could see the little white card propped against the lamp beside it, and the faint gleam of the screen, and he knew with perfect clarity what was written on that card. Eleven digits. A voice that had said, any hour. I will answer.

He did not call.

He could not have said why. It was not pride. It was not fear. It was only that his hand would not reach, and his voice would not come, and somewhere in the deep dim center of him a small stubborn creature had folded its wings and said: I will not ask. I will not ask again. I have asked twice, and each time he came.

It was a ridiculous thing to think. He knew it. He lay on the floor of his own laboratory in the white light, with ice in his bones and his heart beating like a dying bird, and thought of a man coming through a door.

He would not call.

And he would come anyway.

It was the last thing he thought with any clarity. The floor was cold against his cheek. The ceiling had gone gray at the edges, and then black. Somewhere in the corner of the lab a compressor started up, with a long low shudder, and ran for a while, and stopped. He heard it from very far away. He heard the drip of the tap. He heard his own breath, slow and ragged and strangely loud.

And then, from the corridor beyond the double doors, he heard footsteps.

They came quickly.

It was not the slow, soft, unhurried tread that he knew. It was the same step, the same weight, the same long even stride, but it moved with a terrible urgency, nearly running, and each footfall rang on the tile like a struck bell. The doors banged open. A flood of light came in, and with it a sound that Elias had never heard in all his life, and had not known that voice could make.

"Elias."

It was not a word. It was a breath torn out of a man's chest.

A shadow fell across him. A large warm weight came down on the floor beside him, and he felt it more than saw it: knees on the tile, hands hovering, the quick hard rasp of someone breathing as though he had run up a hundred stairs. He tried to turn his head. He could see only a black sleeve, and a pale blur above it, and eyes, wide and dark and desperately steady.

"Elias. Can you hear me?"

He could not answer. His lips would not move.

A coat came down over him.

It fell across his shoulders and his back, heavy and warm and smelling of rain and cedar, and was tucked in quickly around him with hands that shook. They did not touch his skin. They tucked the edges beneath his shoulder and his hip, and drew the collar up around his neck, and pressed once against the wool, hard, as though pressing a wound.

"I am here," said Luke. His voice was hoarse and very low. It cracked on the last word. "Elias, I am here. I have you. I am not going anywhere."

He heard it. Through the ice and the dark and the long roaring silence in his ears, he heard it, and something in the voice went through him like a hand through the surface of a frozen pond.

It was fear.

It was real, and bare, and completely unguarded. He had heard Luke Harrow say a great many things in a great many tones, gentle and patient and wry and grave. He had heard him say it is almost over to a man dying in the rain. But he had never once heard that voice break. It broke now, and the sound of it was the sound of a man who had come within an inch of losing something he could not afford to lose.

He thought: he is afraid for me.

It was an unbearable thought. It was warm and heavy and terrible, and it came to him at the bottom of a long cold well. He tried to say something. He tried to open his eyes. But the dark rose over him like a tide, and the last thing he knew was the weight of the coat, and a hand hovering an inch above his hair, trembling, and not quite daring to land.

And beneath it, faint and far away, a small cold thought, perfectly clear.

Again. He came again.

How did he know?