Read Chapter 13: The Poisoner's Recipe

The cell walls breathed damp air, and Mercy pressed her palms against the cold stone as if she could push through it to the world beyond. Six days until the full moon. Six days until her life hung on the testimony of a man she now knew to be a murderer.

Patience had been taken to the adjoining cell two nights past. Mercy could hear her sister's soft breathing through the wall, a sound both comforting and maddening. She traced patterns in the dust on the floor with her toe—belladonna, henbane, nightshade—the plants that had become her alphabet of survival.

But it was not enough to know the plants. She needed to show how Willard used them.

A knock came at the door—three quick raps, then two slow. Nathaniel's signal. Mercy scrambled to her feet as the lock turned and the heavy oak swung inward. The clerk stood in the corridor, his face half-shadowed by the single lantern he carried.

"Quickly," he whispered. "The guard is taking his supper."

Mercy grabbed his arm. "I need you to listen. Truly listen, Nathaniel. I've been thinking through everything I know of Willard's practice. The patients my mother and I attended who also visited him—there is a pattern."

Nathaniel stepped inside and closed the door behind him. The lantern cast jumping shadows across the cell walls. "What pattern?"

"The bewitchment symptoms—the fits, the visions, the crawling sensations beneath the skin. I've seen them before, in patients who came to my mother after Willard had bled them or given them a tonic." Mercy's voice dropped lower. "Willard treats his patients with remedies meant to produce these very effects. He does not cure them—he prepares them."

Nathaniel frowned. "To what end?"

"Think on it. A patient who raves of being tormented by a specter—whose word holds more weight than an accuser of good standing? Willard's patients become his witnesses. Their suffering gives him power. I suspect he has a standing list of those he can call upon to testify against anyone he wishes to destroy."

She reached beneath the edge of her cot, retrieving a sharp stone she had used to scratch tally marks into the wall. "I'll give you a list of herbs. You must search his office for them or for the preparations he's made. Belladonna, henbane, thorn apple, and possibly wormwood. Look for any tinctures, powders, or dried leaves stored separate from his regular apothecary."

Nathaniel pulled a stub of charcoal from his pocket and a scrap of paper. "I've been in his office before. His apothecary cabinet is carefully ordered. If he keeps something separate, it will be locked away."

"Then find the key. He is meticulous—that is his weakness. A meticulous man keeps records even of what he wishes to hide."

Nathaniel held the paper to the lantern light as Mercy dictated, her voice a low chant of dangerous names. She watched his hand move, his writing neat and careful, and felt a strange tenderness for this boy who had crossed a divide she had not thought bridgeable. His family had called hers witch-kin for three generations. And yet here he stood, charcoal-stained fingers, risking everything.

"These will cause hallucinations if prepared correctly," Mercy said when he finished. "But their effects are not immediate. Willard would need to dose his patients over time—perhaps weeks—building the delusions slowly so they seem organic."

Nathaniel folded the paper and tucked it into his boot. "This pattern you speak of. If I can prove that his accusers share a common treatment history, could that be enough to cast doubt?"

"It could crack the foundation. But I need more than patterns, Nathaniel. I need his hand in the jar."

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Nathaniel left the gaol under cover of gathering dusk. The streets of Salem were quieter than usual, doors shut tight against the arriving dusk and the fear that crept with it. He kept his head down as he walked past the meetinghouse, past the hulking shadows of the Putnam home, to the two-story house that served as Dr. Willard's practice.

The back door gave way to a lock he had learned to open months ago, when his duties as clerk required access to the doctor's patient ledgers for the court. He slipped inside and stood motionless, listening. The house was still. Willard had been summoned to the parsonage an hour past to attend to Mrs. Parris's latest fit.

Nathaniel moved through the darkened rooms with the surety of a man who had memorized the floor plan. The apothecary cabinet stood against the far wall of Willard's study—a handsome piece of oak and brass that spoke of money and learning. He pulled open the drawers, scanning the contents. Powders in glass vials, dried herbs in labeled compartments, tinctures in brown bottles. Motherwort. Valerian. Camphor. Nothing unusual.

He was about to close the cabinet when his fingers brushed against the back panel. It gave slightly—a quarter inch at most. He pressed harder, and the panel slid sideways, revealing a narrow cavity behind.

Inside sat a leather-bound ledger and three glass bottles sealed with black wax. Nathaniel pulled the ledger free and opened it. The spine cracked. The pages within were filled with Willard's precise script, but the entries were not medicines or treatments.

*Abigail Proctor—see treatment begun 12 March. Tincture of belladonna, three drops nightly in wine. Visions intensified. Testimony given 2 April and 17 April—good result.*

Nathaniel's stomach turned. He flipped pages.

*Mary Easty—candidate, not yet begun. Awaiting accusation against M. Hart. Good cause. Ruth Putnam—treatment—* Here the entry stopped abruptly, trailing ink in a way that suggested interruption. He read further down.

*Ann Putnam—treatment discontinued after near-death from excess dose. Useful but unreliable. Prefer younger subjects.*

There were more names, a dozen or more, each with dates and dosages. But it was the final page that made Nathaniel's hand still.

*A special treatment for the Hart tonic. Requires subjects who exhibit wasting illness to test restorative properties. Subjects who die are no loss—physician's prerogative. Andover child suitable. Tonic shows promise but requires refinement.*

The words blurred before Nathaniel's eyes. Willard had been testing Mercy's mother's remedy on dying patients. On a child from Andover. The letter Mercy had told him about, the testimony Ruth had given, spoke of the henbane and nightshade tonic. But here was the evidence in Willard's own hand—words that read more sentence than remedy.

He was about to close the ledger when something else caught his eye. A folded paper tucked between the pages near the back. He pulled it free and unfolded it.

It was a physician's certificate of death, dated four weeks past, for a child in Andover named Joseph Marsh. The cause of death was written as "fever and consumption." But in the margins, cramped and nearly illegible, Willard had scrawled: *Tonic strength underestimated. Lesson marked. Dilution required.*

Nathaniel stood in the dark, the ledger heavy in his hands. The evidence was here. Proof that Willard had killed. Proof that he had manufactured accusations. But what would it take to make anyone read it?

Behind him, a floorboard creaked.

Nathaniel spun. The study door hung open. A figure stood in the threshold—small, hunched, wrapped in a shawl. The face was difficult to discern in the gloom, but the voice that spoke was unmistakably familiar.

"What have you found there, Clerk Hart?"

It was Goody Willard, the doctor's wife, her eyes fixed on the ledger in his hands. Nathaniel shoved the book behind his back, his mind already racing for escape.

"Goody Willard. I—" The words died. There was no innocent explanation for his presence here in the dark with her husband's secret ledger.

"You think you're the first to come looking for Samuel's records?" She stepped forward, and the lamplight caught her face—haggard, hollow-eyed, but lucid. "I've watched three others make the same attempt. They're all in the gaol now, awaiting trial for crimes they did not commit."

The floor was too far, the window too small. Nathaniel calculated his chances, but the woman made no move to stop him. Instead, she reached into her shawl and withdrew a small key.

"Take this," she said, her voice low. "It opens the chest in his bedroom. The one he thinks I don't know about. You'll find what remains of his experiments there."

Nathaniel stared at her. "Why would you—"

"Because my husband is a monster," she said simply. "I have known it for years, but I had no proof and no courage. You've found both. Do not waste them."

She pressed the key into his free hand, then turned and disappeared back into the darkness of the hallway, leaving Nathaniel alone with the ledger and the impossible weight of what he now carried.