The factory smelled like metal and sweat and something else I could not name. Something sharp and chemical that made your eyes water if you stood too close to the machinery. I worked on the assembly line, tightening bolts on auto parts that would end up in cars I would never drive, earning money I would never spend on anything but rent and groceries and the occasional bottle of beer at the bar down the street.

I was fourteen when the fire came.

It was a Tuesday night, my second shift at the factory. My parents both worked there, my father on the welding line, my mother in quality control. They were good people, the kind of people who showed up on time every day and did their work and went home and watched television and went to bed and did it all again the next day. They were not rich. They were not poor. They were just working people, like everyone else in this town that the world had forgotten.

The fire appeared at eleven o'clock at night. I was leaving, clocking out after my shift, when I saw a blue flame in the workshop. It was small at first, no bigger than a candle, but it moved fast, spreading through the metal like water spreading through sand. It consumed everything in its path, but it did not burn. It did not ignite. It simply consumed, turning metal and flesh and bone into fine grey ash that settled on the floor.

I ran. I ran out of the factory and down the street and did not stop until I reached the police station. By the time I got back, the factory was empty. The blue fire was gone. My parents were gone. Their work boots were still by their lockers. Their safety glasses were still on their desks. Their bodies were gone.

The company called it an accident. The newspapers called it a tragedy. I called it the day my life ended, and I meant it.

I dropped out of school after that. High school meant nothing when your parents are gone and there is no one to pay the rent and the house is too big and too quiet and the furniture is still there but the people who filled it are not. I got a job at another factory, making auto parts, and I did it for twenty years, tightening bolts and coming home and drinking beer and going to bed and doing it all again the next day.

The town got worse. Factory after factory closed. Street after street emptied. The people who could not leave stayed, and they got older and sadder and more forgotten, like the town itself, like a wound that never healed because nobody came to clean it.

I met Joe Maloney at the bar. He worked the shift after me, and we would sit together after work and drink cheap beer and talk about nothing. Joe had been in the factory for thirty years, and he had the same look in his eyes that I had, the look of a man who knows that nothing matters and accepts it because there is nothing else to do.

"You ever think about it?" he asked me one night. About the fire. About my parents.

"Every day," I said.

"Me too," he said. "Then I stop thinking about it. Then I start again tomorrow."

That was how it was. You thought about it every day, and then you stopped, and then you started again. You did not fix it. You did not solve it. You just lived with it, like a bad tooth that aches but never gets pulled.

Dr. Harold Finch found me three years ago. He was my physics teacher at the high school, back when I still went to school, back when I cared about things like quadratic equations and Newton's laws and whether the world made sense. He was older now, thinner, with the same tired eyes he had always had.

He found me at the bar and sat down next to me and said, "I have been studying the fire. The blue fire. I think I understand what it is."

I looked at him. "You think?"

"I know," he said. "It is not magic. It is not supernatural. It is a physical phenomenon, a reaction that occurs when certain metals are exposed to specific electromagnetic frequencies. It is rare, yes, but it is real. And it is predictable."

I drank my beer. "Can you stop it?"

"Yes," he said. "But I need your help. I need someone who was there, who saw it, who understands what it feels like to watch something like that happen to the people you love. I need you to help me build a device that can predict when and where the fire will appear, so we can evacuate the area before it happens."

I said no. I said it flatly, without emotion, the way you say no to things you do not want to hear. But Finch did not leave. He came back the next week, and the next, and the next, until I agreed to meet him at his apartment and look at his notes.

His apartment was small and filled with books and papers and equations scrawled on every available surface. He showed me his calculations, the mathematical model he had built to predict the fire's appearance. It was not perfect, but it was close. Close enough, he said, to save lives.

I helped him for six months. I sat in his apartment at night, drinking bad coffee and looking at equations that made my head hurt, trying to understand the mathematics of a blue fire that had destroyed my life. It was not enough to bring my parents back. I knew that. But it was something. It was a way to make sure that no one else had to go through what I went through.

Then Sgt. Maria Torres came to Finch's apartment.

She was military, or something like military, wearing a uniform that was not quite a uniform and carrying a badge that was not quite a badge. She listened to Finch explain his research, and then she smiled and said, "This is very interesting, Doctor. Have you considered its applications?"

Finch looked confused. "Applications?"

"For industrial waste disposal," she said. "Your device can predict when the blue fire will appear. What if we directed it at waste? At toxic materials? At things we want to get rid of? We could clean up the entire Rust Belt in a month."

I felt a cold feeling in my stomach. "You want to use it as a weapon."

"Not a weapon," Torres said. "A tool. There is a difference."

"There is not," I said.

She ignored me and turned to Finch. "The government is prepared to fund your research. Full funding. Enough to build a proper laboratory, hire a team, develop the technology to its full potential. All we ask in return is that you share your findings."

Finch hesitated. I could see the conflict in his face, the tension between his desire to do good and his fear of what good might become. He looked at me, and I shook my head, but he had already made his decision.

"Yes," he said.

The project started the next month. Torres brought in a team of soldiers and engineers, and they set up a laboratory in an abandoned warehouse on the edge of town. Finch was the lead scientist. I was his assistant, though my title was something else, something that sounded more important than what I actually did.

The first test was in a small factory on the outskirts of town. Torres wanted to dispose of industrial waste, tons of toxic chemicals that had been sitting in drums for decades, slowly poisoning the soil and the water. The blue fire was directed at the waste, and it worked. The fire consumed the chemicals, turning them into ash, just as Finch had predicted.

It worked too well.

The fire did not stop at the waste. It spread, consuming everything in its path, metal and concrete and steel, spreading through the factory like a disease. We tried to stop it, but we could not. Finch's predictions were wrong, or incomplete, or based on assumptions that did not hold in the real world. The fire spread beyond the factory, beyond the warehouse, beyond the edge of town.

It consumed three square miles of the Rust Belt. Factories. Houses. Streets. People.

I was not there that day. I was in Cleveland, buying groceries, when the fire started. I heard about it on the radio, a flat calm voice reading a prepared statement about a controlled industrial incident that had gotten out of hand. I stood in the grocery store parking lot and listened to the radio and thought about my parents and the blue fire and the way it had consumed them twenty years ago, and I thought about the people in those three square miles and the way the fire was consuming them now, and I felt nothing.

Not sadness. Not anger. Nothing. Just an empty space where feeling used to be.

I went back to the factory. Joe Maloney was still there, still drinking beer, still talking about nothing. He looked at me and said, "Heard about the fire."

"Yeah," I said.

"Three square miles," he said.

"Yeah."

He poured another beer. I drank mine. We sat in silence.

That night, I went back to the edge of town, to the place where the fire had been. The three square miles were gone, reduced to a flat expanse of scorched earth, like something had been erased from the face of the world. The blue fire was gone too. It had consumed everything, and now there was nothing left to consume.

I stood in the scorched earth and closed my eyes, and for a moment I saw it, the blue fire, moving through the metal like water, consuming everything in its path. I saw my parents, standing in the workshop, their bodies whole, their faces smiling. Then I opened my eyes, and they were gone.

I walked back to town through the cold Cleveland night, and I did not look back.