I

The diary was bound in leather so cracked it flaked like dry river mud. Silas Duran found it in the cellar of Blackwater House, beneath a loose floorboard beneath the root cellar where his grandmother had stored her preserves. The diary belonged to his great-grandfather, Josiah Duran, and it was written in a hand that grew shakier with each page, as if the writer knew he was running out of time.

Josiah wrote of the Sky Serpent—a comet his people had watched return every seven hundred years for as long as anyone could remember. He wrote of the Cherokee medicine man named Tsalagi who had come to the Duran estate in 1831 and shown them the Glowing Stone, a piece of quartz that pulsed with a light that matched the rhythm of the Sky Serpent's approach.

'The stone can turn the Serpent,' Josiah wrote. 'But the Van Der Griffits know this. They have always known. They are the descendants of the men who built the fire-sticks. They will come for the stone, and when they do, we must be ready.'

Silas closed the diary and listened to the sound of the swamp outside the house—the cicadas, the frogs, the slow breathing of water moving through cypress roots. He was a nuclear physicist once, before the blacklist, before he had fled to this rotting house in the middle of nowhere with his seventeen-year-old granddaughter Mabel.

Mabel was sitting on the porch steps when he came upstairs. She was thin as a rail, with dark eyes and hair like spun copper, and she was listening to something he could not hear.

'It is getting louder,' she said.

'What is?'

'The sky. It is singing.'

II

The Van Der Griffits arrived on a Wednesday. Edmund Van Der Griffit drove up in a black Packard with Mississippi plates, accompanied by two men in suits and a surveyor carrying a brass theodolite. They wanted to buy Blackwater House and the hundred acres surrounding it. The offer was generous—far more than the house was worth, far more than Silas had ever paid for it.

'We are building a research facility,' Edmund said, standing on the porch in a white linen suit that seemed absurd in the swamp heat. 'Missile defence. The government needs it. You should be honoured.'

Silas looked at him. He looked at the surveyor measuring the property line. He looked at Mabel, who was standing behind him in the doorway, her hand on his arm, her eyes wide.

'The stone,' Silas said. 'You are not here for the house. You are here for the stone.'

Edmund's smile did not waver. 'I do not know what you are talking about, Mr. Duran.'

But Silas knew. He knew because he had spent twenty years studying nuclear physics before the government decided his name was too dangerous to keep, and he knew the look of a man who was hiding something. The Van Der Griffits had been building weapons since the war. They had funded the laboratories, hired the scientists, built the machines. And somewhere in their family archives was a record of Josiah Duran and the Glowing Stone.

That night, Mabel came to his room. She was shivering, though the night was warm.

'They are lying,' she said. 'The sky is telling me. The Sky Serpent is coming. And the stone is the only thing that can stop it.'

'How do you know about the stone?'

'Because Tsalagi told me. He comes to me in the swamp, when the water is still and the cypress knees rise like fingers from the mud. He shows me the stone. He tells me the Van Der Griffits will try to take it. He tells me we must activate it first.'

III

The swamp at midnight was a different world. The air was thick with humidity and the smell of rotting leaves. Mosquitoes moved in clouds above the water. The cypress trees rose from the black water like the pillars of a cathedral, their knees jutting from the surface like the knuckles of drowned men.

Silas and Mabel waded through the water, carrying a kerosene lantern that cast a sickly yellow light across the surface. Tsalagi was waiting for them on a small island at the centre of the swamp, a figure wrapped in deerskin and silence.

He did not speak. He simply pointed to a rock in the centre of the island—a rock that glowed with a pale blue light, pulsing slowly, like a heartbeat.

Silas approached it. The light grew brighter as he drew nearer, and he felt a vibration in his teeth, in his bones, in the back of his eyes. He reached out and touched the stone.

The world dissolved.

He saw the Sky Serpent filling the sky, white and terrible, entering the atmosphere like a blade. He saw Blackwater House submerged in floodwater, the cypress trees drowning, the Duran estate erased. He saw Edmund Van Der Griffit standing on the deck of his mansion, watching the water rise, his white linen suit soaked, his face a mask of terror. He saw the Van Der Griffit curse passing from father to son for three hundred years, a chain of greed and fear and violence that would never break.

And he saw the stone doing nothing. Not because it could not stop the comet, but because the knowledge of the comet's approach was itself the weapon—the cruel, impossible weapon of seeing the future and being unable to change it.

He pulled his hand away. He was back in the swamp, kneeling in the water, the stone glowing between his palms. Mabel was watching him, her eyes reflecting the blue light.

'Did you see it?' she asked.

'I saw everything,' Silas said. 'And it changes nothing.'

IV

The Sky Serpent passed overhead three nights later. It was visible as a faint streak of light in the western sky, growing brighter and then dimmer, like a candle being blown out.

Silas sat on the porch of Blackwater House. Mabel sat beside him. The swamp breathed around them. Somewhere in the distance, an alligator clicked its jaws.

'Will it come back?' Mabel asked.

'In seven hundred years,' Silas said. 'Or seven thousand. The sky does not keep our schedules.'

Mabel was silent for a long time. Then she said, 'Tsalagi says the stone will glow again when the Serpent returns. And he says we will be here to meet it.'

Silas looked at her. She was seventeen, thin as a rail, with dark eyes and hair like spun copper, and she was listening to the sky with the absolute certainty of someone who had never been told that her hearing was imaginary.

'Yes,' he said. 'We will be here.'

Above them, the last light of the Sky Serpent faded into the black. The swamp breathed. The cypress trees stood in the water like the pillars of a cathedral that had no god and would never need one.

And Silas Duran, former nuclear physicist, blacklist victim, survivor of a curse older than the United States, sat on his porch and listened to his granddaughter hear the future.

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