I have been counting for thirty years. Thirty years of ledgers and accounts, of silver ingots and gold sovereigns and bonds that stretch back to the reign of Queen Victoria herself. I am Arthur Hastings, forty-two years old, chief financial officer of the Westminster Treasury, and I have never made an error in my life.

Until now.

The discrepancy appeared on a Monday morning in November 1893. I was descending the stairs to the counting room, the private vault beneath the main treasury building where the most valuable assets were stored, when I noticed that the first silver chest was lighter than it should have been. Not noticeably lighter—just enough that my trained eye caught the difference. A man who has spent thirty years counting silver would notice if a chest weighed two pounds less than it was supposed to.

I opened the chest and counted the contents. Four ingots were missing. Each one weighed approximately ten pounds. The total value was approximately two hundred pounds, a sum that should have been impossible to miss.

I counted again. And again. And a third time. The numbers were the same. Four ingots were gone, and I had no explanation for where they had gone.

I reported the discrepancy to my deputy, Edward Crowley, a man of thirty-five who had worked with me for eight years and who had never given me cause for concern. He listened to my report with an expression of mild interest, nodded thoughtfully, and said, "That is unfortunate, Arthur. Perhaps it was a measurement error. The scales have been acting strangely lately."

"The scales are precise to the ounce," I said. "This was not a measurement error."

"Of course," Crowley said. "Of course. But perhaps—perhaps someone moved the ingots and forgot to update the ledger. A simple clerical oversight."

I wanted to believe him. I wanted to believe that there was a simple explanation, a clerical error or a miscounting or some mundane explanation that did not involve the possibility that someone had stolen from the Westminster Treasury without my knowledge. But I could not believe him, because I knew the ledger. I had written the ledger. Every entry was in my handwriting, every number was correct, and four silver ingots had disappeared from a locked chest in a locked room that only three people had keys to: myself, Crowley, and the night watchman, a man named Thomas Brown who was seventy years old and too blind to see anything without assistance.

I began to count again. Every chest, every ingot, every coin. I spent fourteen hours in the counting room that day, eating nothing, drinking only water from a pitcher on my desk, recording every number in my ledger with the precise handwriting that had made me famous in certain circles. By midnight, I had counted every silver asset in the treasury, and I had found twelve discrepancies. Twelve ingots were missing, spread across four different chests, each one a small amount that could have been dismissed as a measurement error if one did not know exactly what one was looking for.

I went home that night and could not sleep. I lay in my bed beside my wife Isabella, who was sleeping fitfully as she had been for months—her health declining, her spirit fading, the illness that the doctors could not name and could not cure taking its slow toll—and I stared at the ceiling and tried to understand what was happening.

The next morning, I returned to the counting room at seven o'clock and began counting again. Every chest. Every ingot. Every coin. I counted until my eyes burned and my hands shook and my mind began to blur at the edges. By noon, I had found eight more discrepancies. Twenty ingots were missing in total, and I had no idea who had taken them or why or how.

Crowley found me in the counting room at two o'clock, standing beside an open chest with my ledger in my hand and my eyes fixed on the empty space where the silver should have been.

"Arthur," he said gently. "You look exhausted. Perhaps you should take a day off."

"I cannot take a day off," I said. "The silver is disappearing, Edward. Every day, more silver is disappearing, and I cannot find it, and I cannot understand how it is happening."

Crowley sat down on the stone floor beside me and closed his eyes for a moment. When he opened them, they were different—sharper, darker, more intense than I had ever seen them before.

"Arthur," he said quietly. "What if the silver was never there?"

I looked at him. "What do you mean?"

"What if—what if the discrepancies are not the result of theft? What if they are the result of something else? Something that has nothing to do with silver and everything to do with—" He stopped. He looked away. He looked back. "With memory."

I stared at him. "Memory?"

"You have been counting for thirty years, Arthur. Thirty years of ledgers and accounts and numbers. You have never made an error. You have never been wrong. Do you understand what that means? Do you understand the pressure that places on a man? The expectation? The weight?"

"I understand perfectly," I said. "And I am telling you that the silver is missing. I have counted it. I have verified it. I have—"

"Have you?" Crowley stood up. "Have you really? Or have you counted what you expected to find? Have you verified what you expected to verify? Have you seen what you expected to see?"

I felt something cold settle in my stomach. "What are you saying, Edward?"

"I am saying that I have been watching you, Arthur. For months. I have seen you descend these stairs every morning, ledger in hand, eyes fixed on the chests, mind fixed on the numbers. I have seen you count and recount and count again, searching for discrepancies that may not exist. I have seen you lose weight and lose sleep and lose your mind, and I have been too afraid to say anything."

"Too afraid to say what?"

"That you are ill."

I laughed. It was a short bitter sound that had no humor in it. "I am not ill. I am tired. I am stressed. I am doing my job. There is a difference."

"Is there?" Crowley's voice was gentle but firm. "Arthur, I am your friend. I am your colleague. I am the man who has worked beside you for eight years and who has watched you become someone I no longer recognize. The man I used to know was precise and careful and honest. The man I see now is obsessed and paranoid and—God help you—breaking."

I stood up. My legs were shaking. My hands were shaking. My mind was shaking. "Get out," I said.

"Arthur—"

"Get out!"

He left. I locked the door behind him. I sat down on the stone floor beside the open chest and stared at the empty space where the silver should have been.

And I counted.

I counted every chest. Every ingot. Every coin. I counted until the lantern burned low and the counting room filled with shadows and the silence became so complete that I could hear my own heartbeat.

When I finished, I had found thirty discrepancies. Thirty ingots were missing, spread across six different chests, each one a small amount that could have been dismissed as a measurement error if one did not know exactly what one was looking for.

But I knew. I knew exactly what I was looking for.

I went home that night and told Isabella about the discrepancies. She listened to me in silence, her eyes sad and knowing, and when I finished she said, "Arthur, you have been counting every day for three weeks. You have not slept. You have not eaten properly. You have not spoken to anyone except Edward. Perhaps the discrepancies are not in the silver. Perhaps they are in you."

I told her she was wrong. I told her she did not understand. I told her that I was doing my job and that the silver was missing and that I would find it.

I went back to the counting room the next morning and counted again. And the next. And the next. Thirty discrepancies became fifty. Fifty became eighty. Eighty became a number I could no longer comprehend.

Edward stopped coming to work. Thomas Brown died in his sleep. Isabella was taken to a sanatorium in the countryside, where the doctors would have time to study her illness and try to understand what was happening to her.

And I stayed in the counting room, counting, counting, counting, searching for silver that may never have been there, searching for discrepancies that may have existed only in my mind, searching for a truth that was more terrible than any theft could have been.

Because the truth was this: I had been counting wrong for thirty years. Not occasionally. Not by accident. Systematically. Deliberately. Every number I had recorded had been slightly off, every total had been wrong, every ledger had contained errors that I had convinced myself were correct because I could not bear the possibility that I, Arthur Hastings, precise and careful and honest Arthur Hastings, had been making mistakes for three decades.

The silver had not been stolen. The silver had never been there in the quantities I had recorded. The discrepancies were not the result of theft but the result of a lifetime of self-deception, of a mind that had convinced itself of its own infallibility and had built an entire career on a foundation of errors that it refused to acknowledge.

I sat on the stone floor of the counting room and understood this, and the understanding was like a hand reaching into my chest and squeezing my heart until I could not breathe.

I have written this account in the hope that someone, someday, will understand what happened to me. I was not a thief. I was not a victim of theft. I was a man who loved numbers and precision and truth so much that he could not bear the possibility that he was wrong, and so he became wrong, systematically and deliberately and completely, until the numbers no longer meant anything and the silver no longer existed and the only thing that remained was a man sitting in a dark room, counting, counting, counting, searching for a truth that was more terrible than any lie.