The apothecary’s daughter was bought to be a dying duke’s widow — but she smelled the poison in his wedding wine and knocked the cup from his hand before sixty guests. They locked her in her rooms. The wasps on the terrace died overnight, and no one counted them but her.

PART 1

The silver cup was two hundred years old, and the county had risen to drink from it.

Sixty guests, six deep down the great hall at Halewick, glasses lifted to a dying man — and the bride’s hand moved before the toast was drunk. It struck the cup cleanly from the Duke of Halewick’s fingers in the instant the wine reached his lips. The ring of it on stone filled the room like a bell. The cup rolled, twice, throwing claret the length of her bridal silk.

The Duke of Halewick stood at the head of his own wedding breakfast with wine on his sleeve and death in his face — grey at four-and-thirty, thin as a lath beneath very good tailoring — and while every other eye in the hall went to the ruined toast, his went to his bride.

She had smelled it two seconds before her hand moved, as the cup crossed beneath her face on its way to him. Bitter almonds. Faint and sweetish, riding under the fruit of the wine. Most noses would have called it the claret itself.

Hers had been trained in a shop in Petergate from the age of six. It knew cherry-laurel water the way it knew her father’s voice. A drop of it flavors a confection. A wineglass of it stops a man’s breath before his guests have set down their toast.

“She is mad,” someone said into the quiet.

“The girl is mad.”

“Or drunk,” said a woman near the windows, not softly.

The claret went on spreading between them, dark as an opened vein. Roland Vane came around the table, all warm concern, and reached for the duke’s elbow.

“Cousin. Sit down. The excitement—”

“You will forgive my wife,” the Duke of Halewick said.

His voice was quiet and reached the back wall without effort. Every guest in that hall had learned two years ago how this sentence would end; not one of them had heard it spoken with this weight.

“She has buried a father this year and gained a husband this morning,” he said, “and the wine was not to her taste. Gates. Another bottle.”

No one laughed.

Dr. Croft, who had poured the cup with his own careful hands, was already there with a chair and a physician’s murmur, settling the duke as though he had been waiting for the moment. Behind a fan, a woman said the word apothecary in the tone reserved for plague. And after it, softer, carried under the scrape of chairs:

“—and was there not some business with the father? At the assizes?”

Verity Holt — Verity Vane, for four hours now — stood very straight in her spoiled dress and did her sums.

Roland Vane had chosen her for this marriage because she was nobody. It had not occurred to him, or to anyone at Halewick, to ask what her father had taught her before they ruined him. A tradesman’s orphan, without family, without friends, without one voice in the county to speak for her: a nurse for the deathbed, a widow for the funeral, bought cheaper than the black horses that would one day pull it.

She had stood at the altar that morning as a piece of the estate’s arithmetic. She had stood in the middle of the great hall seven minutes ago as a piece of someone else’s.

The questions were arranging themselves behind the fans, and she let them. She was a shopkeeper’s daughter; she had been trained all her life to take a room’s measure first and be measured in return.

She did her sums.

If she was wrong, she was a madwoman, and the marriage would be set aside, and she would go back to Petergate, where a room above a shuttered shop was waiting for her, if she could hold it against the creditors.

If she was right, someone in this bright room had planned to bury a duke by Michaelmas — and her hand had just made that someone’s work harder, and they would need her explained.

Being right was worse. She had known it at six years old, the first time she watched her father weigh a grain of something that could end a fever or end a man, and count the difference.

The wedding breakfast ran its course. The duke drank water with his dinner. Roland Vane told the table a story about the Prince Regent’s tailor, in perfect time, and the laughter came on cue, and Dr. Croft looked up the table at his patient with a fondness that forty years of practice had made indistinguishable from love.

By nightfall, half the county had heard that the new Duchess of Halewick threw wine at her husband before the toast could be drunk.

By morning, on the terrace where the claret had dried between the stones, the wasps that had come to feed on it lay scattered like spent shot. Dead, every one.

No one thought to look. No one else in the house would have understood what the look meant — that the claret the county had drunk another bottle of, the beautiful dark claret from the honest bottle, had never touched a single lip of the man it had been poured for.

She looked.

She counted eleven of them, folded them into a handkerchief, and laid them at the bottom of her trunk beside her father’s brass scales, beneath the flannel they had been wrapped in these six months, and closed the lid.

The scales had weighed out thirty years of this county’s health. It had taken one season to ruin the man who owned them, and one morning at an altar to hand their keeping to a girl who had spent the rest of her life learning to be careful.

She was careful now.

There was a key in her door that first night.

“For her own comfort,” Gates said, with the decency to look ashamed.