New Orleans in 1893 was a city of ghosts. The heat rose from the streets like breath from a dying man's lips, and the humidity clung to everything like a second skin. The magnolias bloomed in the cemeteries, white and perfect, and the ironwork on the balconies was black and ornate, like the ribs of something that had died a long time ago and was now being remembered.

Silas Durand had fled the Mississippi Delta three months earlier, leaving behind a family that owned cotton fields and slaves and a house that was too big for the four people who lived in it. He had left in the middle of the night, taking only the clothes on his back and a small bag of money his mother had given him. He didn't look back.

He found work in New Orleans as a window cleaner on the St. Louis Building, the tallest structure in the South. It was a nine-story building of brick and iron, and from the top floor, you could see the Mississippi River winding through the city like a brown ribbon. Silas liked the view. It made him feel like he was above the world, even if only for a few hours a day.

The building had an attic, and in the attic lived Victor de La Croix.

Victor was French, or at least he claimed to be, though his accent was older, more European, like the kind of French you heard in books. He was tall and thin, with long fingers and a face that was handsome in a way that made Silas uncomfortable—too symmetrical, too perfect, like a mask.

"You clean well," Victor said on their first meeting. He was standing in the doorway of the attic, watching Silas wipe down the windows.

"I'm paid to clean," Silas replied.

"Are you? Or are you paid to preserve? There's a difference."

Silas didn't understand what Victor meant, but he kept it in mind.

Victor showed Silas his work. In the center of the attic was a large table, and on the table was a sheet of silver foil, folded and refolded into a small square. Victor unfolded it, and it spread out like a flower blooming, revealing a surface that was so reflective it hurt to look at.

"This," Victor said, "is what I call a Sun Collector. A giant mirror, made of silver, that will catch the sunlight and use it to illuminate the entire South. No more droughts. No more darkness. The cotton fields will never suffer again."

Silas looked at the silver. It was beautiful, but it was also dangerous. He could feel it, the way the light bent and twisted around it, the way it seemed to hum with energy.

"Where did you get the silver?" Silas asked.

Victor was silent for a moment. "From a church. In France. It was... acquired."

"Acquired?"

"Taken. Stolen. The word doesn't matter. What matters is what it will do."

Silas didn't like it. The silver felt wrong, like it carried the weight of something bad. But he said nothing. He was a cleaner, and cleaners don't ask questions.

The work took four months. Silas and Victor worked together in the attic, building the Sun Collector, testing the mechanisms, calculating the trajectory. Silas learned more about physics in those four months than he had in his entire life before, and he liked it. He liked the certainty of numbers, the way equations resolved themselves into answers.

But he also learned about Victor's past. Victor's family had profited from the slave trade. His grandfather had owned plantations in Louisiana and shipped slaves from Africa to New Orleans. The money from that trade had built Victor's family's wealth, and the silver for the Sun Collector had come from looted church vestments, taken from a chapel in Bordeaux that Victor's family had burned down.

Silas confronted Victor. "You're using stolen silver to build a machine that will destroy someone else's house?"

Victor's face was calm. "My family built their wealth on stolen lives. I am building mine on stolen silver. It is balance."

"It's not balance. It's revenge."

"Is there a difference?"

Silas had no answer.

The Sun Collector was ready. It was a giant silver mirror, ten meters in diameter, mounted on a framework of iron and wood. It was designed to focus sunlight into a single beam, powerful enough to ignite a building from a mile away.

Victor's target was the mansion of the family that had owned his mother before she was sold to a plantation owner. His mother had been a slave, and she had died in childbirth, leaving Victor alone in the world. He had been raised by his father's French family, but he had never forgotten her.

"I will burn their house," Victor said. "And in the ashes, I will plant new seeds. Cotton seeds. The land will be fertile again, and the new owners will be free men."

Silas looked at him. "You're going to kill people."

"No. I'm going to burn a house. People will escape. That is their choice."

"That's not a choice. That's a gamble with human lives."

Victor's eyes were cold. "My mother's life was a gamble. Her owner gambled that she would die in childbirth. She did. I am gambling that my fire will destroy a house but not the people inside. It is the same gamble, from the other side."

Silas made his choice. On the night before the launch, he climbed to the attic and tried to destroy the Sun Collector. He took a hammer and smashed the silver mirror into pieces, scattering the fragments across the floor like snow.

Victor found him there. He looked at the broken mirror, and then at Silas, and then he laughed. It was a cold, hollow laugh, like wind through a graveyard.

"You have ruined everything," Victor said.

"I have saved lives."

"From whom? From me? Or from yourself? You cannot burn a house and not burn yourself, Silas. You know this."

Silas had no answer.

The fragments of the mirror were scattered across New Orleans for weeks afterward, found in gutters and streets and courtyards, catching the sunlight and throwing it back in a thousand tiny sparks. People picked them up and looked at them, wondering what they were, and why they shone with such a cold, sad light.

Silas left New Orleans. He returned to the Delta, to the cotton fields and the heat and the ghosts. He worked the fields for the rest of his life, and every night, he looked at the sky and thought about the silver mirror, and the man who had built it, and the house that had never been burned.

And he wondered: was it the right choice?

He never knew.