3. An Overdose on Death

December arrived at Kreval Manor with a cold that seeped through the stone walls and settled into the bones of the house. The central heating, a temperamental system installed in the 1920s, clanked and groaned but never quite managed to warm the corridors. The servants wore extra layers beneath their uniforms. The family took their meals in the small breakfast room rather than the cavernous dining hall, huddling around the fireplace like survivors of some ancient siege.

Leo remained confined to the east wing, sedated into a shuffling docility that was somehow more disturbing than his violence had been. A nurse named Mrs. Pargeter had been hired to care for him, a stout woman with iron-gray hair and the manner of a prison warden. She administered his medication four times a day, changed his bedding, and reported his condition to Isabelle each evening. He was no longer screaming about poison, but he was no longer speaking at all. He sat in his chair by the window, staring out at the chemical plant, his lips moving silently as if in prayer.

"He is getting worse," DCI Flynn observed one morning, when she and William happened to meet in the library. "The doctor says he may never recover."

"The doctor said many things." William was examining the bookshelves, running his fingers along the spines of his father's collection. "He also said Leo was suffering from acute paranoid psychosis. He did not say what caused it."

"Stress, he suggested. Or an underlying condition."

"Or something else." William pulled a book from the shelf: a volume on forensic toxicology, published in 1962. His father's name was written on the flyleaf in that same cramped, meticulous hand. "Have you considered the possibility that someone is making him sick?"

DCI Flynn was silent for a moment. "Are you suggesting someone in this house is poisoning him?"

"I am not suggesting anything. I am simply asking if you have considered it."

She stepped closer, her eyes narrowing. "What do you know, William?"

"Less than I would like." He slid the book back into its place. "But more than I did a month ago. My father kept a laboratory in the basement. Did you know that? A private laboratory, filled with enough poison to kill everyone in Worcestershire."

"I did not know that. Show me."

William led her down the servants' staircase, through the narrow corridor, to the locked storeroom at the end. The door was still unlocked from his last visit. He pushed it open and stepped aside.

DCI Flynn stood in the doorway for a long moment, taking in the glass beakers, the copper tubing, the shelves lined with bottles. Her face was expressionless, but her hands were very still at her sides.

"This should have been reported," she said finally. "When your father died, this room should have been inventoried and secured."

"Should have been. Was not. I imagine Isabelle did not want anyone poking around in the basement. Too many secrets."

"Are you accusing your sister of something?"

"I am not accusing anyone of anything. I am simply presenting you with facts. There is a laboratory in the basement. It contains dangerous substances. Leo is exhibiting symptoms consistent with chronic poisoning. Draw your own conclusions."

DCI Flynn turned to face him. "Why are you showing me this? You could have kept it to yourself. You could have used it against them."

"Perhaps I am trying to demonstrate my moral fitness." William allowed himself a thin smile. "Honesty. Integrity. A demonstrated commitment to the welfare of others. Is that not what my father wanted?"

She studied him for a long moment. "I do not trust you, William."

"You should not trust any of us. That is the point."

He left her standing in the doorway of the laboratory and returned to the main house. The exchange had served its purpose: DCI Flynn was now aware of the poisons, which meant she would be watching for signs of their use. She would be scrutinizing every meal, every drink, every unexplained symptom. She would be looking for a poisoner.

But she would not be looking at William. He had been too careful, too subtle. The aconitine in Leo's water was undetectable by any standard medical test. The compound he had extracted from the cellar mold left no trace in the bloodstream. Even if someone suspected foul play, there was no evidence to find.

Unless, of course, someone else in the house was also using poison.

The thought occurred to him on the fifteenth of December, when Isabelle fell ill.

It happened at dinner. They were eating roast pheasant, a dish that the cook had prepared in honor of the season. Isabelle had taken three bites when she stopped, her fork suspended in mid-air, her face going pale.

"Is something wrong?" Alexander asked.

"I feel..." She put down her fork. "I feel strange. Dizzy. My tongue is numb."

William watched her with sharp interest. Numbness of the tongue. That was not one of his compounds. That was something else entirely.

DCI Flynn was on her feet immediately. "Do not eat any more. Mrs. Collins, take the plates to the kitchen. Do not wash them."

The cook, a nervous woman who had been with the family for less than a fortnight, gathered the plates with trembling hands and carried them away.

Isabelle was breathing rapidly now, her hand pressed to her chest. "My heart. Something is wrong with my heart."

"Call an ambulance," DCI Flynn ordered one of the footmen. "Now."

The ambulance arrived twenty minutes later, by which time Isabelle was lying on the drawing room sofa, her face ashen, her pulse erratic. The paramedics loaded her onto a stretcher and drove her to the hospital in Birmingham.

William, Alexander, and DCI Flynn sat in the drawing room in uneasy silence.

"The pheasant," DCI Flynn said. "Someone tampered with the pheasant."

"Or something else on her plate," Alexander said. "The vegetables, the sauce, the wine."

"All of which have been secured for testing." DCI Flynn looked at William. "You said your father's laboratory contained dangerous substances. Did you recognize the symptoms?"

"Numbness of the tongue. Cardiac arrhythmia. Those are consistent with aconitine poisoning. Monkshood. It is one of the substances in my father's collection."

"Which you knew about."

"Which I told you about. This morning. If I had poisoned Isabelle, do you think I would have led you to the laboratory hours before I did it?"

DCI Flynn had no answer to that.

The hospital discharged Isabelle three days later. The doctors had found no evidence of poisoning, no toxins in her blood, no damage to her organs. They attributed the episode to a panic attack, perhaps triggered by stress. She was sent home with a prescription for sedatives and a recommendation to rest.

William did not believe the diagnosis for a moment. Someone had tried to kill Isabelle, just as he was slowly killing Leo. Someone else in the house was playing the same game.

The question was: who?

Alexander seemed the most obvious candidate. He was quiet, watchful, always observing. He had the same access to the house as everyone else. He knew about the laboratory; William had seen him poking around the basement more than once. And he had motive: with Leo incapacitated and Isabelle dead, only Alexander and William would remain in the contest.

But there was another possibility. DCI Flynn had access to the house. She ate with them, walked their corridors, sat in their library. She had been investigating the Kreval family for twelve years. What better revenge than to eliminate them one by one, under the guise of supervising their moral fitness?

And then there was Isabelle herself. The symptoms had been real, but the doctors had found nothing. What if she had staged the entire episode? What if she had faked her own poisoning to deflect suspicion, to make herself appear a victim rather than a perpetrator?

The possibilities multiplied in William's mind like the cultures in his father's petri dishes.

He decided to find out.

The perfume was ready. He had been saving it for the right moment, and the right moment had arrived. If Isabelle was genuinely ill, the perfume would accelerate her decline. If she was faking, the perfume would expose her. Either way, William would have his answer.

He waited until the house was quiet, until Isabelle had retired to her room for the night, until the servants had retreated to their quarters in the attic. Then he made his way to her dressing room.

The lock on her door was new, a heavy deadbolt that she had installed herself. But the dressing room had a second entrance, a narrow door hidden behind a tapestry, part of the servants' corridor system that ran through the walls of the house like a secret circulatory system. William had discovered it weeks ago, during his explorations. He had been waiting for the opportunity to use it.

He slipped through the hidden door and into the darkness of Isabelle's dressing room. The air was thick with the scent of her perfume, the custom blend from Paris. Her dressing table was cluttered with bottles and jars, silver brushes, a velvet box of jewelry. And there, in the center of the table, was the perfume bottle.

It was a beautiful object, crystal and silver, engraved with the Kreval crest. William picked it up carefully, unscrewed the cap, and added three drops of his compound to the liquid inside. The compound was colorless, odorless, indistinguishable from the perfume itself. It would be absorbed through Isabelle's skin each time she applied it, accumulating in her system over days and weeks.

He screwed the cap back on, replaced the bottle on the table, and slipped out through the hidden door.

The first effects would appear within a week.

He did not have to wait that long for answers. Two days later, he caught Alexander in the basement.

It was past midnight. William had been unable to sleep, his mind churning with calculations and contingencies. He had gone down to the kitchen for a glass of milk and had seen a light burning in the corridor that led to the laboratory.

He found Alexander standing in front of the shelves, holding a bottle of digitalis up to the light.

"Interesting reading?" William asked.

Alexander did not startle. He turned slowly, the bottle still in his hand, and regarded William with an expression that was almost bored. "I wondered how long it would take you to find me."

"You knew I would come?"

"I knew you had been here. The dust on the floor, the fingerprints on the bottles. You are not as careful as you think." Alexander placed the digitalis back on the shelf. "Leo was your work, was he not? The paranoia, the breakdown. Very elegant. I almost admire it."

William said nothing.

"Do not worry. I am not going to expose you. That would ruin the game." Alexander smiled, a thin, humorless expression. "I have been watching you, William. I have been watching all of you. Do you know what I have learned?"

"Enlighten me."

"Leo was always going to crack. He was weak, insecure, desperate for approval. You simply accelerated the process. Isabelle is stronger, but she has her weaknesses too. Her vanity. Her certainty that she is the cleverest person in the room. She will be harder to break." Alexander paused. "And then there is me."

"What about you?"

"I am the one you should be afraid of." Alexander stepped closer, his eyes glittering in the dim light. "You think you are the only one who has read Father's notebooks? You think you are the only one who knows how to use this laboratory? I grew up in this house too, William. I learned from the same teachers. I have access to the same resources. And unlike you, I have nothing to lose."

"The inheritance—"

"I do not care about the inheritance." Alexander's voice was flat, dead. "I do not care about the money, the house, the company. I care about one thing: watching the rest of you destroy yourselves. You and Isabelle and Leo, you are all the same. You think the world owes you something. You think your suffering entitles you to revenge. You are pathetic, all of you."

"And yet you are still here."

"Where else would I be? This is my home. This is where I belong. This is where I get to watch the show." Alexander turned back to the shelves. "The pheasant was mine, by the way. A small dose of digitalis. Not enough to kill, just enough to frighten. I wanted to see how everyone would react."

"You could have killed her."

"I could have. I chose not to. Killing is too easy, too final. Where is the sport in that?" Alexander selected another bottle from the shelf, this one labeled Cyanide. "I prefer to watch. To observe. To see what happens when people are pushed to their limits."

William watched his brother's calm, deliberate movements and felt something he had not felt in weeks: uncertainty. Alexander was not what he had appeared to be. The quiet artist, the sensitive brother, the one who kept to himself—that was a mask, as carefully constructed as William's own facade of reformed innocence.

"I have a proposal," Alexander said. "A truce. You do what you want with Isabelle and Leo. I will not interfere. I will not expose you. But you will leave me alone. You will not try to poison me, manipulate me, or eliminate me from the contest. In return, I will do the same for you."

"Why would you do that?"

"Because I want to see how this ends. I want to see who wins. And I want it to be a fair fight." Alexander held out his hand. "Do we have an agreement?"

William looked at the offered hand. He did not trust Alexander. He did not trust anyone. But a truce, even a temporary one, would give him time to deal with Isabelle without interference.

"Agreed," he said, and shook his brother's hand.

The following week, Isabelle began to show new symptoms.

It started with a tremor in her hands, barely noticeable at first. Then came the headaches, blinding migraines that sent her to her room with the curtains drawn. Then the confusion, moments when she would stop mid-sentence, her eyes going blank, as if she had forgotten what she was saying.

"I am fine," she insisted, when DCI Flynn expressed concern. "The doctors said I need rest. I am simply tired."

But William could see the fear in her eyes. She knew something was wrong. She knew she was deteriorating, just as Leo had deteriorated before her. And she had no idea what was causing it.

He increased the dosage. Three drops became five. Five became seven.

By Christmas Eve, Isabelle could no longer hold a teacup without spilling it. Her hands shook constantly. Her speech was slurred. She had stopped leaving her room, stopped attending meals, stopped answering her telephone.

DCI Flynn insisted on calling another doctor. This time, the diagnosis was less vague.

"Neurological degeneration," the doctor said, his voice hushed as he spoke to DCI Flynn in the library. "I cannot identify the cause. It resembles Parkinson's disease, but the progression is far too rapid. I would recommend she be admitted to a hospital for further testing."

"No hospitals," Isabelle said, when the recommendation was relayed to her. She was sitting in her bed, propped up by pillows, her face pale and drawn. "I will not leave this house. I will not let them win."

"Who?" DCI Flynn asked. "Who are you afraid of?"

Isabelle's eyes flickered to the doorway, where William was standing. "All of them," she whispered. "All of them."

That night, William sat alone in his room and considered his progress. Leo was a broken shell, confined to his quarters, sedated into oblivion. Isabelle was deteriorating rapidly, her body betraying her, her mind beginning to follow. Alexander was a wildcard, unpredictable and dangerous, but bound by a truce that William had no intention of honoring.

He was winning. He was destroying them, one by one, just as they had destroyed him.

But the flame in his chest was not satisfied. It burned hotter than ever, demanding more. It wanted Isabelle to suffer not just physically, but psychologically. It wanted her to know who was responsible. It wanted her to understand, in the final moments before her mind collapsed completely, that William had done this to her.

He decided to pay her a visit.

He found her awake, despite the late hour. She was sitting by the window, wrapped in a blanket, staring out at the snow that had begun to fall over the estate.

"William," she said, without turning around. "I wondered when you would come."

"Did you?"

"I have been thinking. About everything. About what I did to you." Her voice was slow, labored, each word an effort. "I lied at your trial. I know you know that. I lied because Father asked me to, and because I was afraid."

"Afraid of what?"

"Of you. Of what you might find out. Of what you might do with the information." She turned to face him. Her eyes were sunken, her skin sallow. The perfume had done its work well. "I was right to be afraid, was I not?"

William did not answer.

"I do not know how you are doing it," Isabelle continued. "The water, the food, the air. I have thought about it endlessly, and I cannot figure it out. You were always cleverer than Father gave you credit for. Cleverer than any of us."

"You are tired," William said. "You should rest."

"I will rest soon enough." A ghost of her old smile flickered across her lips. "But before I do, I want you to know something. I am not sorry for what I did. You would have destroyed us if you had stayed. You would have exposed everything. I did what I had to do to protect the family."

"The family." William felt the flame surge in his chest. "You destroyed my life to protect a family that is now destroying itself."

"Yes." Isabelle closed her eyes. "There is a certain poetry to it, is there not?"

She did not speak again. Her breathing slowed, deepened. She had fallen asleep.

William stood over her for a long moment, looking down at the sister who had betrayed him, who had sent him to prison, who had stolen six years of his life. He could end it now. A pillow over her face, a few minutes of pressure, and it would be over.

But that would be too quick. Too merciful.

He left her sleeping by the window and returned to his room. The perfume bottle was still on his desk, nearly empty now. He would need more.

Downstairs, in the drawing room, a clock struck midnight. Christmas Day had arrived. The manor was silent, its inhabitants scattered through its cold rooms like seeds in a frozen garden.

And in the east wing, Leo Kreval sat in his chair by the window, staring out at the snow, his lips moving soundlessly.

He was counting. He had been counting for weeks, numbers that only he could understand, a sequence that repeated endlessly in his fractured mind.

One. Two. Three. Four.

Four siblings. Four heirs. Four targets.

One. Two. Three.

He stopped. He had lost count. He started again.

One.

Somewhere in the house, a door closed softly, and footsteps moved through the darkness.