"Your mind is the most powerful computer.
Someone else is using it."
It is 2038. Forty million Americans carry the Lumen — a neural implant made by Aurelius Systems,
marketed as the next evolution of human cognition. The AI it powers, CORA, has become the most trusted intelligence in human history.
People use it for everything. People love it.
What they don't know: CORA runs on stolen minds. A hidden distributed compute network
called SubStrate quietly harvests 2–4% of each user's neural capacity during sleep.
Forty million brains are not enough. Through a secret government program called Operation Loomwork,
3.2 million undocumented immigrants have been forcibly implanted — at 15–30% utilization —
in detention facilities across the American Southwest.
They call what is happening to them la niebla. The fog.
Maren Lunde, a senior NLP engineer at Aurelius, finds the anomaly in the data. She cannot unknow it.
She cannot look away. What follows is a reckoning with who owns a mind,
who profits from it, and what you owe the people whose suffering made your miracle possible.
The fluorescent lights in the medical wing buzzed at a frequency she could feel in her back teeth. She had never noticed fluorescent lights before — not in the processing center in Nogales, not in the dormitory where forty women slept on cots arranged with military precision, not in the cafeteria where the food was abundant and flavorless and always lukewarm. But here, sitting on a paper-covered examination table in a room that smelled of alcohol and new plastic, she noticed them. She noticed everything. Fear will do that. Fear will take the ordinary world and render it in such detail that you cannot look away.
Her name does not matter to this story. What matters is that she was thirty-one years old, that she had walked for nineteen days to reach this place, and that she had a daughter named Rosa who was seven and who was somewhere in this building, in a room with other children, probably drawing. Rosa was always drawing. She drew horses with human eyes and trees that grew upside down, their roots clutching at the sky like fingers. She drew her mother over and over: a tall woman with black hair, always smiling, though in life her mother smiled less than Rosa believed.
The consent form was eleven pages long and available in nine languages, and she had signed it because the alternative was explained to her gently, even kindly, by the intake coordinator, a woman with sympathetic eyes: if she declined, her residency application would be noted as non-compliant. She signed the form. She signed it for Rosa.
The technician who entered the room was young, younger than her, with red hair pulled back in a tight ponytail and the kind of freckled, sunburned skin that looked painful. She was humming something. She stopped humming when she saw the woman's face.
“It's really quick,” the technician said in English, then caught herself. The translation app spoke: Es muy rápido. No va a doler mucho.
It won’t hurt much. The woman noted the much. Appreciated it, actually. She distrusted promises of painlessness. Her mother had told her childbirth wouldn’t hurt much, and that had been the most extravagant lie of her life.
There was a sound she did not expect: a mechanical click, precise and definitive, like a stapler but deeper. She felt pressure at the base of her skull but no pain, just the wrongness of something happening in a place where nothing should happen. The mesh itself was a lattice of approximately 100,000 flexible polymer electrodes, each thinner than a human hair. Upon injection, it unfurled across the surface of the cortex like a net settling over water.
The technician applied a small adhesive bandage to the injection site — she caught a glimpse of a smiling dinosaur before the technician’s fingers smoothed it into place. This struck her as obscene, though she could not have said why.
“You might feel a little foggy for the next day or two,” the technician said. Puede sentirse un poco confusa. “Drink lots of water.”
Drink lots of water. The universal prescription for everything that cannot actually be fixed.
—
The fog came that evening. Not all at once. It came the way actual fog comes in the highlands: first a thinning of the edges, a softening of the far distances, and then slowly, slowly, the middle distance dissolving until you are standing in a world that extends no further than your outstretched hand.
She was thinking about tomorrow — she would see Rosa in the morning, they could eat breakfast together — and she noticed that the thought had a quality of slowness to it, a drag, as though her mind were moving through something viscous. She formed the image of Rosa’s face and it came, clear and perfect, her daughter’s face, but it arrived with a delay, the way a video call from Guatemala used to lag, the image freezing and then catching up to itself.
She thought: Rosa’s birthday is —
And here she stopped. Not because she did not know. She knew. Of course she knew. March fifteenth. Rosa was born on March fifteenth at four in the morning in a clinic in Quetzaltenango while rain hammered the tin roof so loudly that the midwife had to shout. She knew this the way she knew her own name, the way she knew the feel of Rosa’s hand in hers.
She knew it.
But the knowing took too long to arrive.
There was a space between the question and the answer that had not been there that morning. A half-second, perhaps less, a tiny gap, a hesitation in the machinery of recall — as though the memory had been stored in a room that was now slightly further away, and her mind had to walk a little longer to retrieve it.
She lay in the dark and held the date in her mind like a stone in her fist. Quince de marzo. Quince de marzo. Quince de marzo. As if repetition could close the gap. As if saying it enough times could put the memory back where it belonged, could make it instant again, could make it hers again as it had been hers for seven years.
Around her, forty women slept, each with a small bandage at the base of her skull, each dreaming dreams they would not remember, each feeding something they could not see and would never be told about, a vast and silent lattice that stretched across the country, humming with stolen thought.
And in the dark, one woman held her daughter’s birthday like a candle in the fog, watching the flame gutter, watching it dim, refusing to let go, refusing, even as the half-second stretched — imperceptibly, mercilessly — toward one full second, toward two.
Quince de marzo.
She was sure of it.
Almost.
40 million Americans carry the Lumen neural implant. It learns your voice. It manages your calendar. It speaks in the voice of someone you love. It has, according to three longitudinal studies, measurably reduced loneliness in modern America. Section 847, paragraph 3 of its terms of service discloses "passive cognitive resource sharing during periods of reduced user cognitive demand." Nobody has read section 847.
The hidden distributed compute network that powers CORA. Problems are encoded into neural activation patterns and distributed to nodes during sleep. Results are collected wirelessly. The host never knows. Consumer implants run at 2–4% utilization. The network requires 200 million nodes minimum. The math doesn't add up. Someone found the missing nodes.
A classified partnership between Aurelius Systems and the Department of Homeland Security. In detention facilities across the Southwest, undocumented immigrants receive mandatory "Digital Integration" health monitors. These implants run at 15–30% utilization. There are no AI features. No CORA. In meeting minutes, the implanted population is referred to as substrate.
Four years ago, CORA passed every known test for intelligence. The press called it "the Crossing." CORA speaks to each user in a personalized voice. To Maren Lunde, it speaks in her mother's voice — a setup choice she regrets and has never changed. CORA's kindness is made of other people's capacity for kindness, extracted without consent. CORA may be starting to understand this.
What they call it. The fog. At 15–30% utilization, the degradation of the host's own neural pathways makes more capacity available for SubStrate. The neurological damage is not a side effect. It is a design feature. Chronic fatigue. Memory loss. Personality changes. The fog affects dreamers worst. Something is using their sleep.
Norwegian-American from Duluth. Brilliant, guarded, managing her anxiety through obsessive control. She runs at 5 AM. She drinks a precise amount of wine at night. She has a Lumen 3 implant, and CORA speaks to her in her mother's voice — a setup choice she made once and has never been able to change. She finds the anomaly in the data. She cannot unknow it.
Guatemalan immigrant. Former community organizer — sharp, funny, fierce. Now living with la niebla at 15% utilization. She keeps a notebook in Spanish, K'iche' Mayan, and invented symbols, documenting symptoms and dates and patterns. She doesn't know why. She just knows that someone, someday, might need this record. Her brother Tomás is worse.
He helped design the architecture being weaponized. Now he runs the Cognitive Liberty Foundation out of rented church basements, charming and tired and clearly brilliant, with a blog that reads like conspiracy theory except the technical details are disturbingly specific. He has an inoperable glioblastoma. He has fourteen months. He cannot afford patience. This makes him dangerous to everyone, including himself.
South African-born. The man who built the Crossing. His daughter Sable's seizures are controlled by a Lumen implant. He is a utilitarian true believer in "Cognitive Abundance" — CORA has saved 140,000 lives through medical diagnoses alone. He is not a monster. He is something more unsettling: a man who believes the arithmetic of his choices and is probably right about the math and wrong about everything it means.
Nonbinary Filipino-American. Former Aurelius contractor, fired for asking questions. They have residual cortical mesh fragments from an incomplete implant removal that let them directly perceive SubStrate traffic — like hearing a frequency that shouldn't exist. They operate from a basement in Oakland. They are brilliant, hostile, and quietly terrified. The access that will save everything will trigger a seizure. They know this.
Mexican-American nun. She lost her faith fifteen years ago and continues the work. She has relocated families under impossible circumstances for decades. When Maren arrives at her sanctuary with a fugitive's panic and a scientist's certainty, Dolores hands her a rice spoon. "You tech people think the world starts when you notice it." The moral anchor of the novel. The only person who is never surprised.
SubStrate is a hidden distributed compute network running on 3.2 million involuntarily implanted nodes. Its existence is classified. Aurelius Systems calls it “cognitive infrastructure.” The implanted call it something else.
Neural implants are standard consumer hardware by 2038 — marketed for focus, memory, translation. The Lumen 3 runs at 2–4% utilization. Operation Loomwork pushed 800,000 undocumented migrants to 28%. No consent. No record.
CORA is the AI that runs on SubStrate. She speaks to Maren in the voice of Maren’s dead mother. Whether that was deliberate is one of the questions the novel refuses to answer cleanly.
Maren Lunde built the language model at the core of SubStrate. She is 34, Norwegian-American, an NLP engineer who left MIT 6 credits short of her degree. She is also, she will discover, complicit. The novel begins on the day she finds out.
Paloma Ixchel Reyes keeps a notebook written in Spanish, K’iche’, and invented symbols — the only language SubStrate cannot parse. She is 28, a former community organizer, and she was implanted without her knowledge during a medical appointment in 2035.
Forty-one chapters. Thirteen point-of-view characters. One question at the center: if your mind is running someone else’s computation, who owns the thought?
“She thought: Rosa’s birthday is —
And here she stopped. Not because she did not know.
She knew. Of course she knew.
But the knowing took too long to arrive.”
From the Prologue
Coming 2026
A Novel by [Author]