The first thing Sienna Hale learned about being a bride was that no one tells you how heavy the dress is once the party ends.

She sat at the vanity in the suite at the top of the Bellandi estate, still wrapped in forty feet of ivory silk and lace, and began pulling pins out of her hair one at a time. There were thirty-one of them. She had counted them going in that morning, the way she counted everything when she was afraid: the stairs in the cathedral, the candles on the altar, the guests who had not looked her in the eye. Thirty-one pins, two hundred and twelve guests, one husband.

The maid had left twenty minutes ago, after unhooking the top of the bodice, and Sienna had spent most of the time since in the dressing room, fighting the rest of the hooks and listening to the great house settle around her. Now the veil lay across the chair behind her like something that had finally given up. Through the tall balcony doors the whole of Marenna Bay glittered below the hill, the harbor lamps strung along the water, the great orange cranes of the port standing dark against a sky the color of a bruise healing. It was a beautiful view. It belonged to a man who owned most of what she could see.

She set a pin on the tray and looked at her own reflection. Twenty-six years old, chestnut hair coming down in loose waves, hazel eyes too bright and too steady, as if the face in the mirror had been told to behave. She had spent six years in the toxicology lab at Marenna General teaching herself to notice small things. A tremor in a technician's hand. A reagent that had been stored a degree too warm. A patient who said they were fine in a voice that said otherwise.

She had been noticing all day.

She had noticed that the music at the reception faltered, just for a beat, when Matteo Bellandi crossed the ballroom, as if the orchestra itself had remembered who he was. She had noticed that no one touched him without being invited to. She had noticed that when her father, Edmund, shook the groom's hand at the altar, he held on a second too long and smiled a second too wide, the smile of a man who had just watched a debt turn into a wedding.

And she had noticed Matteo's hand. During the toast, while two hundred people raised their glasses and a man named Dario Vance said something warm and witty about family, her husband had held his flute so tightly that his knuckles had gone pale. When she looked up at him, he was not looking at the crowd. He was looking at her, with an expression she could not file under any heading she knew. It was not hunger. It was not triumph. If she had been forced to put a word on it, in the clinical way she put words on everything, she would have said it looked like a man trying not to flinch.

Which made no sense. Men like Matteo Bellandi did not flinch. They were the reason other people did.

Sienna turned the thin gold band on her finger, around and around, the way she had been doing since the vows. Her father had signed the papers with the Bellandi family eleven weeks ago. The sum had been spoken aloud in the kitchen of the old house on Tern Street, in a whisper, as though the walls might tell. She had understood then what she was: not a bride but a payment, delivered in white.

She made herself breathe the way she did before a difficult assay. In for four. Hold for four. Out for six.

It's one night, she told her reflection. You've survived worse than one night.

A knock sounded at the door, two knuckles, unhurried, polite in a way that somehow made her stomach drop.

"Come in," she said, and was annoyed that her voice came out smaller than she meant.

Matteo Bellandi stepped inside and closed the door behind him with the care of a man who knew exactly how much noise a door could make. He had taken off his jacket and loosened his tie, and for the first time that day he looked less like a portrait and more like a person. Thirty-three years old, dark hair swept back from his forehead and already coming loose at the front, sleeves turned once at the wrist. The signet ring on his right hand caught the lamplight. He stopped just inside the room, a deliberate distance from her, and stayed there.

"I won't stay long," he said.

"It's your house."

"It's your room." He said it simply, the way someone states the time. "For tonight, and for as long as you want it to be."

Sienna said nothing. Whatever she had braced for, it had not been a man who waited at the threshold.

On the sideboard by the window, a silver ice bucket sat sweating in the warm air, a bottle of champagne tilted in its crushed ice with a white ribbon tied around the neck, two crystal flutes beside it on a linen napkin. A small card was tucked under the ribbon. The sideboard had been bare when the maid brought her up. Hadn't it? The thought arrived and went before she could examine it.

Matteo followed her glance. His eyes went to the card and rested there a moment too long. Something crossed his face, quick as a bird past a window, and then it was gone.

"A gift from the family," he said, and slid the card out and read it. He did not tell her what it said. He put it in his pocket. "They like their traditions."

"And you don't?"

"I like some of them." He crossed to the sideboard, still keeping that careful distance from her, and lifted the bottle from the ice. "One glass. Then I'll go and sleep in the study, and you can lock the door behind me. I'd like you to lock it."

She stared at him. "Why would you want me to lock it?"

"Because it will help you sleep." He eased the cork out with his thumbs, no theatrical pop, just a soft sigh of gas. "You don't have to be afraid of me tonight."

The pin she was holding bent between her fingers. "Who said I was afraid?"

He glanced, very briefly, at her left hand, at the ring she had been turning raw against her knuckle. "Your hands," he said.

It should have felt like an insult, being read so easily. Instead, to her irritation, it felt like being seen, and she did not know what to do with that. She had spent the whole day armored. Every guest, every smile, every hand on her shoulder had slid off her like rain. This one sentence had gone straight through.

She made her fingers still. "You're very observant for a man in your line of work."

"It's the only reason I'm still in my line of work."

The corner of his mouth moved. It was not quite a smile; it was the memory of one, something he had put away a long time ago and had just remembered where he'd left it. Sienna noticed, with an irritation that was almost a relief, that it changed his whole face. He looked younger. He looked, impossibly, kind.

He poured. The champagne rose pale gold in the glasses and the bubbles climbed like tiny sparks. He carried one to her, holding it by the stem, and stopped an arm's length away so that she had to reach for it herself. It was such a small courtesy. It made her throat tight.

"A traditional toast," he said, "is supposed to wish you something."

"What do you wish me?"

He took a long moment to answer. His eyes were very dark in the lamplight and very steady, and she had the strangest feeling that he was choosing from many things, and that most of them were not for saying aloud.

"A long life," he said at last. "A very, very long one."

She should have refused it. Later, in the long dark, that was the thought she would come back to again and again, with a bitterness that had nothing to do with fear: she, of all people, should have refused it.

But she was tired, and her father's debt sat on her chest like a stone, and the man in front of her had just wished her a long life in a voice that sounded as though he meant it. She had a kit in her handbag, downstairs in the cloakroom, a roll of paper test strips she carried the way other women carried lipstick. It was a private joke at the lab. Hale and her little papers. She almost laughed, thinking of the look on her colleagues' faces if she told them she had spent her wedding night without so much as dipping a corner.

So she stood, and the heavy skirts whispered around her, and she crossed the space between them and lifted her glass.

"A very long life," she repeated. "I'll hold you to that."

"Please do."

Their glasses touched. The crystal rang, one clear note, and in the quiet that followed she became aware of how close she was standing. She had to tilt her head back to meet his eyes. She could smell the starch of his shirt and something warmer under it, cedar and clean skin. A lock of hair had slipped down over his forehead and she had the absurd, unwelcome urge to push it back.

He lifted his free hand, slowly, giving her every chance to step away. With one knuckle he touched the loose tendril that had fallen against her cheek and eased it behind her ear. It was barely a touch. It lasted less than a second. Yet it traveled through her like a current, from her temple to the soles of her feet, and she heard her own breath catch in the quiet room.

Matteo heard it too. His hand stilled. Something in his face, in the careful architecture of it, shifted for one unguarded second, and she thought, with a dizzy certainty she could not explain: he is afraid. Not of her. For her.

Then he lowered his hand and stepped back, and the room made room for air again.

"Drink," he said quietly. "Before it loses its sparkle."

She drank.

It was good champagne. Dry, cold, almost austere, with a sweetness that arrived late. She took a second sip to be polite, and by the time she lowered the glass she noticed that her fingertips had gone cold.

Not chilled. Cold, the way a hand goes numb after holding ice, a prickling coolness that began at the pads of her fingers and went no further. She flexed them against the stem of the glass. Nerves, she thought. A long day, no food since noon, a corset laced too tight. She told herself that three times, in the same clinical voice she used on frightened patients, and she believed it almost to the end of the third time.

Then a faint taste bloomed at the back of her tongue, thin and bright and wrong. Like licking a coin.

Her training arrived before her fear did.

That was the mercy and the cruelty of being who she was. A civilian would have felt only the wrongness of it, the cold and the coin and the slow, strange heaviness gathering in the limbs. Sienna felt all of that, and she also heard the tidy, pitiless voice of a lecture hall she had sat in six years ago. Onset within minutes. Peripheral coldness first. Metallic taste. Then the throat.

She knew the class of agents that did this. She had run the screens on three cases at the hospital, two accidental, one not, and the memory of the third case's lab sheet rose in her mind in perfect clarity, columns of numbers, a note in the margin in her supervisor's cramped hand. Rapid. Largely undetectable without a specific panel. Nobody tests for it unless they already know.

She looked down at the glass in her hand. The champagne glittered, innocent as water.

"Matteo," she said.

It came out as a whisper. Not a dramatic one. Her voice simply did not have the weight to carry any further. The cold had climbed past her wrists and was moving up her forearms like a tide coming in over sand, and her lips had begun to tingle, a faint electric fizzing as if she had pressed them to a battery.

He turned. "Sienna?"

She tried to say poison. Her tongue felt thick and slow and strange, a stranger's tongue lent to her for the occasion. The word came apart before it reached her teeth.

The flute slipped out of her fingers. It did not shatter. The thick Persian rug took the fall, and the glass rolled once on its side, spilling a pale gold stain across the wool, and lay still. She stared at it with enormous, absurd calm. What a waste of good crystal, she thought.

Her knees went next.

There was no pain, which surprised her. She had always assumed there would be. Only that spreading, icy, patient weight, and under it, rising fast, the thing she had not allowed herself to feel all day: pure animal terror. She was twenty-six years old. She had a half-finished paper on delayed-onset neurotoxins in her desk drawer at the lab. She had a father who would wake to a telephone call. She had not finished being alive.

She reached for the nearest thing, which was the front of Matteo's shirt, and her fingers closed on the fabric without feeling it.

"Sienna." His voice had changed completely. The low, even, unhurried tone was gone, and what replaced it was raw. "Look at me. Look at me."

She tried. Her head had grown enormously heavy, but she lifted her eyes to his face, and what she saw there made her forget, for a moment, to be afraid of dying.

Matteo Bellandi was frightened.

Not wary. Not angry. Frightened, openly, in a way that stripped ten years and a thousand carefully built defenses off him all at once. The color had left his face. His mouth was open slightly, as if he had begun a sentence and lost it. His eyes moved over her, rapidly, hungrily, cataloguing, her lips, her pupils, the pulse in her throat, the way a man looks at the one thing he has never been able to afford to lose.

He knows what this is, she thought, and the thought was cold and clear and could not be held. He knows what this is.

She tried to speak again. Nothing. Her throat had closed to a thread. She could feel her pulse in her ears, loud and then strangely distant, like footsteps in the next room.

Matteo caught her as her legs finally folded, one arm hard around her back, the other under her knees, and the force of his grip told her more than anything he could have said. He went down with her to the floor, onto the spilled wine and the crushed silk, and the whole bright ruin of her wedding gown billowed up around them both.

He turned his head toward the door and shouted.

"Marco!" It was a voice that could have stopped a warehouse full of men. It cracked at the end. "Marco! Get the doctor up here! Now! Now!"

Somewhere beyond the door, far off, a chair scraped and feet began to run.

Then his attention was back on her, all of it, as if nothing else in the world had ever existed. He pushed the veil's loose edge off her face with an unsteady hand. "Don't close your eyes," he said. "Please. Please, Sienna. Stay awake."

He snatched the veil from the chair and tucked its soft folds beneath her head, and laid her down on the rug with enormous care, one hand cradling the back of her skull as though she were made of something that could be broken by the wrong kind of touch. Then he pressed two fingers against her throat and held them there.

She felt the tremor in them, a fine hard shaking he could not control, and she understood that this was not a performance. She had seen performances. She had been lied to by experts: by her father, by the debt collectors who came to the house with smiles, by every man who had ever promised her safety in a pleasant voice. She had developed an ear for it, a fine-tuned instrument.

This was not a lie. This was a man whose hands would not stop shaking.

"Your pulse is slow," he said, to no one, to himself, a murmured litany. "It's slow. It's still there. It's still there." He said her name again, the whole thing, Sienna Hale, as though it were something he was afraid to drop. She had thought of him all day as Bellandi, the surname the whole city said in a lowered voice. Now he was only Matteo, a man kneeling on a ruined carpet.

His other hand found hers and held it. The warmth of his palm was the last sensation she could feel clearly. Everything else had gone away, down into the cold, and that single point of heat remained, anchoring her.

She thought: if this man poisoned me, he is the finest actor in the world.

And then, with the cruelty of reason, from the part of her mind that never switched off: or he did not know the champagne was meant for her. Or it was never meant to spare him either.

The thought made no sense and every sense. The card. The way his eyes had stopped on it. The thing that had crossed his face and gone. She wanted to ask him what the card had said. She wanted it more than she had wanted anything in her life, which was absurd, because she was dying on a carpet in a wedding dress and what the card said no longer mattered, and yet she had never been able to leave a question alone.

Her lips moved. No sound.

He bent his head down to hers, so close his hair brushed her forehead. "Don't talk," he said unsteadily. "Save it. The doctor's coming. They're coming."

But she could hear, beneath the words, what he was not saying. His voice knew what hers knew. They were out of time.

The edges of the room began to blur and close in, as if someone were slowly drawing a curtain around the lamplight.

She watched the ceiling go gray. She watched Matteo's face go with it, his features softening into shadow, his voice stretching long and thin as though he were speaking to her from the bottom of a well. Somewhere a door banged. Voices rose, a woman's, a man's, shouting over each other. The sounds were already wrapped in cotton. She could not make out the words.

But she saw him sway.

It was a small thing, and she almost missed it. He was kneeling over her, still holding her hand, and then his shoulders dipped a few inches, and he braced his free hand against the floor. A line of sweat shone on his temple. He blinked slowly, like a man waking in a strange room, and looked past her, to the sideboard, to the bottle in its melting ice. Then to the second flute, the one he had set down on the linen after pouring.

It was empty.

He had drunk, she realized. Of course he had. He had raised that glass at the toast and taken his sip while she took hers, and he had not touched the table since. A cold thread of understanding passed through the fog in her mind. He had not been watching her die. He had been dying with her, and refusing to say so, refusing to let go of her hand long enough to call attention to himself.

His lips were turning pale.

He looked back at her. His eyes, that dark, steady, unreadable gaze that had unsettled her all day, were wide open now, and in them she saw no calculation at all. Only something enormous and grieving, and a kind of dazed wonder, as though he had been struck by a thought too large to hold.

He lowered himself beside her, slowly, deliberately, until his shoulder pressed against hers and they lay on the ruined rug in the wreckage of silk and champagne like two people who had lain down to watch the stars. His hand never left hers. His fingers were as cold as her own now. She felt them tighten, as hard as they could.

His mouth shaped one word. She could not hear it, but she read it as clearly as print. Stay.

The last thing she heard was her own heartbeat.

It was slow, and then slower. Each beat took a little longer to arrive than the one before, a clock running down in an empty house. She felt strangely unafraid now, wrapped in a heavy, tender quiet, with the warmth of a cold hand in hers and a hundred small things about this man turning over and over in her mind.

The question that rose, in the end, was not why, or how long. It was a plain, practical, scientific little thought, the thought of a woman who had never learned to leave a question alone.

The sideboard had been bare. She was sure of it now. While she was in the dressing room, fighting forty hooks and counting her own breaths, the suite had held a bed, a vanity, a balcony, and nothing else. No bucket of ice. No bottle with a white ribbon. No card.

And the ice had barely begun to melt.

Someone had been in the room. Someone had stood in the quiet, in the short time she was out of sight, and set out a bottle and two glasses and a card in handwriting that made her husband go still.

Who else was in the room?

The heartbeat stopped waiting for an answer.

Darkness came in softly, like a tide, like an arm drawing a blanket over a sleeping child. The lamplight went out. The cold went out. The hand in hers, the warm, terrible, shaking hand, faded last of all.

And then, from far away, thin and bright and insistent as a bird at a window, came a sound she did not recognize.

Beep.

Beep.

Beep.