Chapter 1
The late-afternoon lights lean through the living room window like a warm breath, brushing the dust motes into slow-drifting gold. The city below buzzes with its usual rhythm, buses groaning at the curb, vendors calling out the latest prices of the day, students spilling out of cafes with half-finished drinks and armfuls of notebooks. It is an ordinary soundscape, layered and familiar, the kind Lucia always claims “feels alive”.
Julia barely notices any of it.
She sits at the small table by the window, a biology textbook open in front of her, though she is not reading so much as dissecting. Highlight marks, sticky tabs, lists written in her compact handwriting scatter around the pages like the aftermath of a small storm. Her notes were scattered across the table: diagrams of cell membranes, genetic markers, a half-finished exercise. She has been preparing a lesson outline for the mock teaching exam scheduled next week. Even though it is only practice, she treats it as though lives depend on it.
The door clicks open.
Lucia’s laughter drifted from the hallway as she kicked off her shoes, the sound as familiar as her own heartbeat. She steps inside with her usual burst of energy, a breeze rather than a person. Her dark hair is tied in a loose braid, strands escaping and catching the gold of the setting sun. Her smile comes easily, lightly, as though the weight of the world never quite settles on her shoulders.
Normal. Ordinary. Predictable.
Julia found comfort in things like that.
“You should see what Agustín did today,” Lucia said as she entered the small kitchen, lowering her backpack with a dramatic sigh. “He told his entire class that I was a dragon and that I knew thirteen languages.”
“You do, in fact, breathe fire when someone interrupts your lessons.”
“That was one time.”
Julia couldn’t stop the silly laughter that burst from her. Lucia’s presence softened the edges of the room the way sunlight warmed cold tile. She was already opening the fridge, rambling about a student’s test, the bus ride, the old woman who had complimented her earrings...
The apartment itself is small. Two bedrooms, a cramped kitchen, a living room barely wide enough for the sagging sofa and table. The walls are thin enough that they can hear the couple on the seventh floor argue every Thursday. The paint peels in the hallway. The elevator sometimes stalls between floors. But it is central, inexpensive, and close to their jobs. And from the eighth-floor window, the view opens into a sweep of rooftops and sky that always makes Lucia sigh with a kind of contentment.
Today, the sky is unusually vivid. Clouds edged in molten orange, streaks of pink and violet. Beautiful in a way that pricks at Julia’s instincts. She studies it, brows slightly drawn.
Lucia grins, when she notices the open textbook next to her twin. “Studying again?”
“Preparing,” Julia corrects gently.
“For an exam that doesn’t grade you.”
“That’s irrelevant.”
Lucia laughs, soft and warm, and crosses the room to kiss her sister’s head in passing. Her rings glint in the light, the same silver Julia wears, matching, because Lucia insisted years ago.
The lights flickered.
Not a power outage. Not exactly. More like a pulse, a brief, soundless vibration that passed through the air and through Julia’s bones. She lifted her head sharply.
Lucia paused. “Did you feel...”
Another pulse. Stronger.
The glass on the table trembled. A low hum filled the apartment, like distant metal grinding against itself. The window rattled in its frame. Julia’s hand moved automatically to steady the table, though the motion was pointless.
“Earthquake?” Lucia asked.
“Maybe.” Julia stood.
She stepped toward the window. Outside, the street looked unchanged at first. Cars moved. People walked. But the sky... The sky was wrong.
A thin line stretched across it, like a crack in a pane of glass. Faint, shimmering, almost invisible unless you looked directly at it.
Impossible.
“Julia.” Lucia says again, quieter this time. “What is that?”
“I don’t know.” The admission tasted cold. Julia hated not knowing.
Another vibration rolls through the building, this one longer, deeper. The apartment lights flicker, dim to a faint glow, then flare back with a soft pop. Down in the street, a bus jerks to a halt. People stop walking. A collective hesitation ripples outward, as though the entire city holds its breath.
The lights died.
Lucia grabbed her arm. Julia didn’t flinch. Her mind was already shifting, tightening into the clarity that came only when something was truly wrong.
Neighbors begin spilling into the hallway. Muffled voices. Footsteps. Doors slamming.
“We should go.” Julia decides.
“Go where?” Lucia asks. “Outside? Is it safe?”
“I don’t know. But staying here isn’t.”
It’s the calmness in Julia’s tone that makes Lucia nod. Not because Julia sounds certain, she doesn’t, but because Julia never speaks without weighing every possibility first.
The hum deepened into a low, resonant groan that made the floorboards quiver. Something outside screamed, high, warping, inhuman. A car alarm wailed. Somewhere glass shattered.
Julia grabbed her own backpack from the corner already half-prepared, always half-prepared, and shoved inside a jacket, her notes, a bottle of water, a multitool she kept for hiking trips, snacks. Her hands were fast, methodical. Fear moved under her ribs like an animal, but she caged it. Later. She could panic later. Lucia mirrors her, though her hands shake while she ties her laces.
Another scream echoed from the street. Not human.
Lucia flinched. “Julia...”
I need to protect her.
“It’s okay.” It wasn’t, but Julia needed her to move. “We’re going.”
The hum is louder now. It vibrates in their chests like a second heartbeat.
Julia opens the door.
The hallway is dark except for the fading glow of emergency exit signs. Voices cluster in the shadows, whispers, cries, someone muttering a prayer under their breath.
The elderly woman at the end of the hall clutches her rosary, eyes darting between the sisters and the ceiling as though expecting it to collapse. She always greets Lucia with warmth, but she averts her eyes from Julia, uncomfortable with her seriousness, her silences. She whispers to herself, “¿Está temblando? Is it shaking? Is it the building?”
Lucia squeezes her arm apologetically but follows Julia. There’s no time for comfort. No space for explanations.
A young couple stands near the stairwell. They’re usually arguing, but today they cling to each other, wide-eyed. The boyfriend lifts his chin as they approach, as though waiting for instruction. They don’t give any and simply begin descending.
The stairwell is narrow and smells faintly of damp concrete. Every sound echoes up and down, footsteps, whispers, the distant creak of pipes. The lights along the walls flicker weakly, buzzing like tired insects.
Lucia breathes lightly behind her, not out of fear, but out of trust. She places her foot where Julia places hers. When the stairwell vibrates again, she presses a hand to the railing and Julia steps closer, subtly creating a buffer.
On the sixth floor landing, a man Julia recognizes emerges from the shadows, tall, quiet, the one who always returns home past midnight. He nods in acknowledgment, eyes darting to the trembling light fixtures.
“Is this an earthquake?” he asks.
“No,” Julia says before she can stop herself.
The word slips out clean and absolute. She doesn’t know why she feels so sure, only that earthquakes don’t come with humming or pulses or cracks of light in the sky.
By the fifth floor, the air feels heavier. Pressure builds in the narrow shaft, pressing against their ears. Lucia winces. Julia keeps moving.
“What if the stairs collapse?” Lucia whispers.
“They won’t,” Julia says. “The building’s old but solid.”
She hates the lie instantly. But she cannot give Lucia uncertainty. Not now.
Another pulse rolls through the structure. The railing shivers under their grip. A hallway door bangs open above them, someone shouting. The hum grows louder, pressing into the skull like static.
Ignore it.
They reach the third floor. Someone sits on a step crying softly. Lucia pauses, instincts tugging her toward the stranger, but Julia touches her arm. Lucia nods, swallowing her guilt.
The stairwell smells of metal and dust now. The lights flicker more frequently. The hum deepens, resonant like something alive. Julia’s pulse syncs with it for a moment, an uncomfortable echo, and she shoves the sensation aside.
Finally, they reach the ground floor. The lobby is a mess of people murmuring, arguing, clutching their phones, refreshing news feeds that refuse to load. The elevator stands frozen mid-floor, its doors stuck half-open like a mouth mid-scream. Someone hits the button repeatedly to no effect. The front doors are propped open. A hot wind blows inward, carrying dust and an odd metallic scent, as if the air has been scraped from inside the earth. They step into the threshold. And the world outside is wrong.
The sky above the buildings is split by a thin, luminous crack, no wider than a knife’s edge, yet impossibly long, stretching across the horizon. Light leaks from it, not warm like sunset, but pallid, cold, shimmering like something alive beneath the surface.
People on the sidewalk stare upward. Some film with their phones. Others simply stand frozen.
