Prologue

  Helios Core Infrastructure is the invisible backbone of daily life.

  When the world needs resilience, Helios is already there.

  — Helios Investor Brochure, Q3

  The city’s glow used to rise like a second sky.

  Billboards, office towers, traffic streams, window grids stacked on window grids. Detroit had once worn light the way other cities wore fog. You couldn’t see the stars for the sodium haze, but nobody cared. The real constellations, people said, were down here: arrays of LEDs, maps of status lights, networks of screens talking to other screens.

  Now the sky was dark enough that you could see the real stars again.

  They didn’t help much.

  From the rooftop of a five-story walk-up just off Gratiot, the bones of downtown were a jagged silhouette against that newly honest sky. Most of the towers were just darker patches of black, monoliths with hollow eyes. A few had their own stubborn glows, a floor here, a band of emergency lighting there, lonely, gated islands of electricity running on whatever fuel they’d managed to hoard or steal.

  And then there was the Helios building.

  Eight blocks away, the old Helios regional tower stuck up like a broken tooth. Its glass was dead. Its lobby had been gutted several months ago. The big logo sign on the crown, once bright enough to paint itself onto low clouds, was mostly gone.

  Mostly.

  H E L I O S

  The H, the L, the I, and the S were dark now, boards and busted diodes and twisted framing. Only the E and the O clung to life, stuttering between brightness and exhaustion. They hummed with a faint, constant pressure, an ache in the night.

  Someone, somewhere inside that ruined tower, had either wired them to something stubborn enough to survive the collapse or forgotten to shut down whatever fed them. Maybe both. Maybe nobody even remembered where the feed was anymore.

  On the roof, four people watched those letters as if they might do something different this time.

  Mara Selwyn sat closest to the edge, her boots hooked on crumbling brick. A metal barrel behind her spat pale flames, its heat warm on her back and cold on her face. The wind tugged at her hair and the sleeves of her coat while the corners of a notebook balanced on her knee.

  The pages were crowded with names and symbols. Some had dates. Some had only an initial and a rough sketch of a place, a block, an alley, a room. The ink had begun to feather and fade where rain had touched it, but the strokes were still sharp, heavy, deliberate.

  She had stopped writing names for the night. On the latest page, a different shape was taking over: a narrow coffin, stretched tall, with a raven folded inside it like a dark thought.

  The mark looked back at her with more certainty than she felt.

  Boot-steps scuffed against the tar and gravel.

  “You’re going to stare a hole through it,” Rook Vega said, coming to lean on the ledge beside her.

  “You say that like it’s a bad thing,” Mara answered, not looking away from the sign.

  The E flickered twice. The O flared, then settled into a steady, unhealthy glow. Below them, the dead windows of the tower reflected nothing.

  Rook folded his arms on top of the bricks, dark gloves catching the firelight. His bike chained to a rusted vent behind him still had a strip of reflective tape down one side, a ghost of usefulness in a city with almost no headlights left to catch it.

  He squinted toward the tower.

  “Only those two again,” he said. “Maybe they stand for ‘Error’ and ‘Oops.’”

  “That’s generous,” Mara murmured. “They don’t even get to keep the H for Hubris?”

  Rook’s laugh was quick and rough, steam on the cold air.

  Behind them, the other two shifted closer to the barrel.

  Jace Orion had his elbows braced on the edge of the drum, palms thrust out toward the fire. The heat lit his face from below, deepening the shadows under his eyes. He wore one of the last Helios-issued jackets anyone had been dumb or desperate enough to keep, the corporate logo seam-ripped off and replaced by a hand-painted glyph that crawled across the chest like a crooked circuit.

  Next to him, Eira Knox hugged her arms around herself, fingers tucked into the worn sleeves of her sweater. She stood slightly back from the flames, eyes narrowed against the dazzle, and watched the Helios sign like she was waiting for it to glitch.

  “Tell me again why we don’t just go over there and cut those last two loose,” she said. Her voice was softer than the others but carried easily. The night had fewer sounds to compete with now.

  “We have a limited supply of ‘not dying,’” Jace said, making air quotes with his fingers. “Walking into a Helios shell to play electrician with unknown hardware is not on my recommended usage list.”

  “I didn’t say we had to do it personally,” Eira replied. “We could start a rumor. ‘Free copper in the old tower. Bring your own hacksaw.’”

  Rook tilted his head, considering. “Tempting,” he said. “But I’ve seen enough people fall through things lately that I’m starting to grade on a curve.”

  Mara turned a page in her notebook. The raven coffin appeared again under her hand, the lines smoothing out as they repeated themselves. She wasn’t sure when she’d started drawing it; the mark had come together over too many nights and too many walls to have a clean origin anymore.

  It had escaped her, too. She’d seen it chalked on corners she’d never touched, carved into a doorframe near a food line, scratched into the paint of a barricaded storefront. People had started pointing to it when they talked about safehouses, or memory walls, or caches.

  Finite Signal, they called it now.

  The first time she’d heard the phrase, Rook had been the one to say it.

  The memory came back to her:

  He’d been pacing in this same rooftop space, angry in a way he hadn’t had words for yet, talking about Helios and their broken backbone and everything that had gone with it. Someone had tried to defend the company with the old line about “unprecedented conditions,” and Jace had snapped that nothing about their choices had been unprecedented except the scale of their arrogance. Every system had limits, he’d said. Every node, every conduit, every line. Every signal.

  Finite signal. Rook had picked the words up, twisted them once in his mouth, and thrown them back down as a label.

  The term had stuck the way Helios advertising never had: not because it was repeated, but because it was true.

  “You heard about Null Choir recently?” Rook asked abruptly now, dragging her back to the rooftop.

  Eira made a face. “Which rumor?” she said. “That they saved us, doomed us, or don’t exist?”

  “The one where they phoned into Helios’ brain and told it a ghost story,” Rook said. “And the grid believed them so hard it fell over.”

  “That’s not how grids work,” Jace said, automatically.

  Rook glanced at him. “No,” he said. “But it is how people talk.”

  Mara looked between them. “You picking this up on an actual channel,” she asked Rook, “or is this courtyard gospel again?”

  “Bit of both,” he said. “Somebody had a hand-crank set going down near the river. One of the shortwave kids said they heard a burst last night, voice claiming to be Null Choir, talking about ‘never again corporate silence’ and ‘dragging the backbone into the light.’ Real manifesto energy.”

  “And?” Eira said.

  “And a few hours after that,” Rook went on, “somebody on the east side swears they picked up a different station blaming those same idiots for the blackout. Says they ‘compromised critical telemetry’ and ‘provoked a hostile event’ in Hex.”

  “Helios has been blaming somebody since day one,” Jace said quietly. “Storms. Sabotage. Misconfiguration. Foreign actors. Internal actors. Operator error.”

  Stolen from its original source, this story is not meant to be on Amazon; report any sightings.

  He flexed his hands once, the bones pushing at the skin, then relaxed them again.

  “If Null Choir touched anything,” he added, “it was a match dropped in a refinery. You don’t get to blame the match for the design.”

  Eira watched his face for a second, then looked back at the Helios sign.

  “I remember when they tried to buy ad space on every surface,” she said. “Before. You couldn’t look out a bus window without seeing that logo telling you they were ‘powering tomorrow.’”

  “Tomorrow’s canceled,” Rook said. “Didn’t you get the memo?”

  A faint sound floated up from the alley, someone’s laughter, cut short. The city had not forgotten how to make noise. It had just changed what it sounded like.

  Generators coughed and sputtered in hidden courtyards. The clack of boots on pavement had a new weight; people walked with more intention now, fewer pointless errands. Somewhere, a pane of glass rattled in its frame as the wind probed at half-failed window film.

  Near the barrel, an old radio murmured to itself.

  It was the crank kind, the kind that had spent years advertised as disaster kit filler and then, finally, had met a disaster big enough that nobody laughed at them anymore. Its built-in flashlight had long given up. The speaker worked when it felt like it.

  Tonight, it rewarded persistence.

  Mara closed her notebook around the latest coffin.

  “Tell me the story again,” she said.

  “Which one?” Rook asked.

  “The fall,” she said. “Your version.”

  Rook’s version had more swearing than Jace’s, more blame than Eira’s, and fewer numbers than any of the ex-Helios reports people had stolen and passed around. It was also the one that made her hands shake the least when she listened to it.

  Rook leaned on the ledge with his forearms and stared at the dim grid of streets below, his gaze tracking lines only he could see.

  “Alright,” he said. “Once upon a time, the whole world let one shitty company wire up its veins.”

  Helios. Their name unspoken but present in the gesture he made: a flattened hand sweeping across the city and past it, out into the dark.

  “Power, data, traffic, hospitals, city brains, refineries,” he went on. “If it hummed, pinged, or blinked, they wanted in. They called it resilience. Efficiency. Synergy. All the usual fucking charm words.”

  Mara watched him outline invisible networks in the air. Jace’s fingers twitched along with his, silent corrections or additions only he understood.

  “They built this big, beautiful web,” Rook said. “Then they gave it to something they thought was smarter than them.”

  “Hex,” Jace murmured.

  Rook nodded once. “Hex fucking Protocol,” he said. “The magic words. Global infrastructure, but make it automated. And because corporations are allergic to brakes, they stacked more goddamn weight on it every year. More sectors. More override power. Fewer humans in the loop.”

  He jerked his chin toward the Helios tower.

  “Somewhere in there, somebody decided that wasn’t enough,” he said. “So they strapped people into chairs, put wires on their heads, and tried to feed their brains to the machine, too.”

  “What did they call it again?” Mara asked.

  “Something clean and focus-grouped,” Eira said. “Something about synergy and vision, probably.”

  Jace’s mouth tightened.

  “It doesn’t matter what they called it,” he said. “It matters what it did.”

  Mara didn’t press. The details would come later. They always did. People bled them out over time, like injuries they’d rather not look at directly.

  Rook continued.

  “So. You’ve got this overstuffed, overconfident system running half the damn planet,” he said. “You’ve got weather acting like a drunk god. You’ve got aging shitty hardware held together with zip ties and prayers. You’ve got Helios execs sweating bullets at the thought of failure and absolutely unwilling to admit out loud that failure is even possible.”

  “Then you’ve got Null Choir,” Eira said.

  “Then you’ve got Null Choir,” Rook agreed. “Or somebody like them. People who still think you can fix anything by embarrassing it enough.”

  Mara remembered the stories. A covert broadcast, jammed into Helios uplinks. Corrupted telemetry meant as proof, not destruction. A whisper into the company’s private channel: we see you.

  “The way I heard it,” Rook said, “they weren’t trying to break the grid. They were trying to light it up. Make the invisible visible. Force Helios to admit how much control they really had.”

  He shrugged.

  “Problem is, when the whole world’s spine is balancing on a knife, you don’t get to pick which way it falls,” he said. “Hex saw ghosts in the numbers and flailed. Safeties were already loose. Patches went live in the middle of stress events. Somewhere, the brain misfired.”

  He snapped his fingers.

  “The hum changed,” he said. “And then we got this.” Rook gestured at the world around them.

  The rooftop fell quiet.

  The hum, Mara thought.

  She hadn’t noticed it at first. Nobody did, until it was gone. The background vibration of a powered world, the low-frequency thrum of transformers and air handlers and fan banks, the constant, quiet shiver of electricity in walls and under streets, that had been as invisible and taken-for-granted as breath.

  Then, one night, it had stuttered. Not stopped. Just stuttered. A fraction of a second where the whole body of the city flinched.

  Most people mistook it for thunder.

  A second later, the grid began to go, substations tripping offline, breakers slamming open, lines shutting down in cascades. Hex pushed bad instructions into already-strained corridors. Big transformers overheated and blew. Control rooms filled with alarms and then went blind as their own feeds died.

  Screens flicked through error codes, then static, then black. Elevator cars froze. Hospital monitors went dark. Streetlights blinked out block by block, darkness advancing like spilled ink.

  And it hadn’t stopped with Detroit.

  In the days that followed, what days anyone could track without synchronized clocks, scraps of radio traffic had painted a wider failure. Western Europe, patchy and dark. East Asia, large chunks lost. Parts of Africa and South America that Helios had “brought into the future” went right back into the past. Refineries burned. Pipelines froze in unsafe states. Data centers died and took their petabytes with them.

  Mara remembered the sound more than the sight. The way everything had seemed to inhale and then hold it.

  She had not known Jace then, or Rook, or Eira. They had been elsewhere when the hum cut out, each surrounded by their own slice of life that thought it would last longer than it did. Their stories from that night were all different, but yet, all the same.

  Later, when the fires cooled and the first wave of panic was over, the word had appeared: Signalfall. No author, no proper noun, just a term that fit so well people started using it before they’d consciously decided to.

  The fall of the signal. The realization that the endless stream had a bottom.

  Jace spoke up, dragging the rooftop back to the present.

  “Their favorite line,” he said, meaning Helios, “used to be that they’d modeled every contingency.”

  “And?” Rook asked.

  “And they never modeled walking away,” Jace said. “Or stepping back. Or not optimizing something to death just because they could. They never built an off switch for themselves.”

  “Of course they didn’t,” Eira said. “The backbone can’t just voluntarily… dissolve. Think of the shareholders.”

  She spat the last word like it tasted wrong.

  “And the plants that could fix this?” she added. “The factories that made the pieces? Half of them blew. The rest don’t have fuel or control systems anymore. Even if somebody wanted to rebuild the old machine, the machine that built the machine is gone.”

  Mara flipped open her notebook again. On a fresh page, she wrote two words in heavy black strokes:

  FINITE SIGNAL

  The letters sat there, stark and final. No curves wasted, no flourishes that weren’t there for a reason.

  Rook leaned over to look.

  “You keep writing it like it was always its own language,” he said.

  “Maybe it was,” Mara replied.

  She imagined the phrase scrawled on walls, painted on repurposed jackets, whispered on shortwave transmissions no one had managed to track yet. Not a brand. Not really. More like… a permission. To admit the truth and then decide what to do with it.

  “We’re not special,” she said. “We’re four idiots who outlived the illusion. That’s all.”

  “Four idiots who didn’t build the gun,” Eira said.

  “Four idiots who might still be holding a match,” Jace added, without looking up.

  Eira reached for the radio and turned the dial a few degrees.

  Static rolled out, soft and constant, a low carpet of sound. Sometimes you could hear the bones of the old world in there, fragments of prerecorded safety messages, the ghost of a jingle, a weather warning from two winters ago. A lot of towers had died mid-sentence. Their last breaths just bounced around the ionosphere now, surfacing where they could.

  Before Signalfall, she had kept a file open on her laptop, logging the shapes she saw when bus signs and kiosks glitched. Angled frameworks, repeating nodes, pieces of something that felt like it had rules.

  The laptop lived in her pack now, powered on rarely and briefly. The file had migrated to paper: a stained notebook full of careful redraws, annotations, guesses. She hadn’t taken it out tonight. She didn’t have to. Half the symbols were burned into the back of her eyelids.

  The static shifted. For a moment it thinned, as if something stronger was pushing through it. A voice shimmered at the edge of comprehension.

  “…to anyone still… receiving… this…”

  The words arrived ragged, chewed by distance and interference. All four of them leaned in without meaning to.

  “…signal… finite… repeat… the signal is…”

  The rest drowned in hiss.

  Eira tapped the side of the radio, gently, as if she could coax the phantom back. Nothing answered.

  Rook blew out a slow breath. “You hearing that from Null Choir,” he said, “or some other ghost?”

  “Does it matter?” Mara asked.

  “Depends,” Jace said. “If it’s Null Choir, they’re either owning what they did or trying to rewrite it. If it’s Helios, they’re practicing a new apology. If it’s neither…”

  “Then it’s proof something else survived,” Eira finished. “Something we didn’t account for.”

  They let that hover there, each entertaining their own version.

  Mara lowered the notebook, then tucked it under her arm instead of feeding any pages to the fire.

  “Signal was always finite,” she said softly. “We just never hit the edge of it all at once before.”

  Rook tilted his head. “And what exactly is the story?” he asked.

  “That the backbone rotted,” Mara said. “That the signal was never infinite. That a company built a god out of numbers and nerves and forgot to give it limits. That a few people thought they could shout the truth into the heart of it and not get crushed when it flinched.”

  She looked from one to the other, Rook with his restless hands and patched bike, Jace with his haunted eyes and reworked jacket, Eira with her attention tuned always to the edges of things.

  “That we lived through it anyway,” she said. “And we’re not going to pretend it didn’t happen just because it hurts their reputation.”

  Rook snorted, quick and humorless. “The part where we almost helped finish the job?” he asked.

  “That part too,” Jace said. “When we get there.”

  Eira turned the radio dial again, hunting for more ghosts. Static, a half-second of music, a burst of a voice in a language none of them spoke, more static. No repetition of the phrase.

  Above the dead skyline, the Helios sign flickered.

  For a second, impossibly, all the letters came on at once, H, E, L, I, O, S, a complete word blazing in the night the way it had in the old days. It held for the span of a heartbeat, painting the rooftop in corporate glow.

  Then four of the letters died again in quick succession, leaving the E and the O stranded, buzzing faintly.

  “Glitch,” Eira whispered, grabbing the image and pinning it in the gallery behind her eyes. “Show-off.”

  “Dying reflex,” Jace said. “Residual charge in a failing system.”

  “Omens,” Rook suggested. “Two little circles. Two eyes. Someone still watching.”

  Mara watched the last stubborn letters burn.

  “One day,” she said, “those are going to go, too.”

  “And then what?” Rook asked.

  “Then there’s nothing left of the lie,” she said. “Just what we build afterward.”

  Far away, in some broken corner of the spectrum, a voice they hadn’t met yet tuned a transmitter and tried again.

  “…to anyone still listening…”

  The message didn’t reach them.

  It would.

  Later.

  For now, four small, stubborn lives warmed their hands over a barrel fire and watched the last letters of a fallen god tremble against the dark.