Read Chapter 4: The Encoder

The basement stairs had never felt this long. Julien’s flashlight beam bounced off concrete walls slick with condensation, and the smell of damp earth and old wiring thickened with every step. Behind him, Camille’s footsteps were steadier than he expected—she’d insisted on coming, and he’d learned in twelve hours not to argue with her.

“The generator room’s through here,” he said, pushing open a rusted metal door. The room was smaller than he remembered, a cramped tomb of dead machinery. The generator itself sat in the corner like a sleeping beast, its casing cold to the touch.

He crouched, playing the light over its control panel. “Damn.”

“What?” Camille moved closer, hugging her elbows against the chill.

“It’s not just the grid. This thing’s been deliberately disabled.” He pointed at a panel that hung open, wires dangling like severed tendons. “Someone pulled the main relay. This isn’t failure—it’s sabotage.”

Camille was quiet for a moment. “The intercom system, too. I thought it was just down with the power, but when I tried to buzz the bakery this morning, it didn’t even static. Like someone cut the line.”

Julien straightened, wiping his hands on his trousers. “That’s not coincidence. Someone in this block doesn’t want communication leaving the building.”

They climbed back toward the ground floor in silence. When they emerged into the courtyard, the morning light had turned sharp and thin, casting long shadows across the cobblestones. The two bistro cooks were already ladling something hot from a cauldron, and a queue of residents snaked toward them with chipped mugs and bowls.

Camille nodded toward a bench by the dried-up fountain. “We need to talk to people. Find out who’s been near the basement in the last twenty-four hours.”

“You think it’s someone in the building?” Julien asked, though he already knew the answer.

“Someone made a list of apartment numbers,” she said, her voice low. “And unit 7 is circled. The same unit where Marc vanished.”

Julien ran a hand through his hair, matted from a night of smoke and sweat. “Let me check the intercom wiring first. Maybe there’s a physical trace.”

The intercom panel was mounted in the vestibule, a sleek modern unit that looked out of place against the building’s Haussmann bones. Julien unscrewed the faceplate and peered inside. The wires were intact—no cuts, no burns. But as he traced them with his fingers, he noticed something odd: a small device, no bigger than a matchbox, wired into the circuit board. It was black, matte, utterly nondescript.

“What is it?” Camille asked.

Julien pulled it free carefully, turning it over in his palm. “A jammer. Low-frequency. It wouldn’t block direct radio, but it would scramble any signal trying to transmit out of this panel. Whoever installed this knew exactly what they were doing.”

He felt a prickle at the back of his neck. They were being watched.

“I know what that is.”

The voice came from behind them, high and clear. They spun around. A girl stood in the shadow of the stairwell, skinny, with a shock of blue-streaked hair and dark circles under her eyes. She looked maybe nineteen.

“Léa,” Camille said, recognition flickering. “Unit 4. You’re the one who fixed the café’s router last spring.”

Léa shrugged, stepping into the light. She wore cargo pants and an oversized hoodie, and her fingers were stained with something that might have been ink or grease. “The router was easy. That—” she pointed at the device in Julien’s hand—“is military grade.”

Julien’s jaw tightened. “How do you know that?”

Léa crossed her arms. “Because I intercepted the signal that came with it.” She paused, looking between them. “I was running a scanner from my balcony the night the grid went down. I caught something—a transmission burst, encrypted, directional. It originated from this building. And it was sent exactly eleven minutes before everything went dark.”

The courtyard sounds faded into a dull hum. Camille stepped closer. “You’re saying someone in this building coordinated the blackout?”

“I’m saying someone knew it was coming.” Léa’s voice was quiet, but it carried. “I tried to decode the packet. I managed to crack the header—it was a military frequency, NATO-flagged. The content is still locked. But the timestamp matches the moment of failure. That’s not coincidence.”

Julien stared at the jammer in his hand. “Why would the military black out Paris?”

“Not the military,” Léa said. “Someone using their frequency. But it takes serious equipment and serious clearance to spoof a NATO channel. Whoever did this isn’t a random looter. They’re organized.”

Camille’s face had gone pale. “And they’re in this building.”

Léa nodded slowly. “Or they were. The signal was clean, almost surgical. Whoever sent it knew exactly what they were doing.”

Julien pocketed the jammer. “Can you finish decoding the message?”

“Maybe.” Léa’s eyes flickered with something—fear, or excitement, or both. “I have a rig in my apartment. It’s not much, but it runs on a car battery and I’ve got a satellite stub antenna. If I can get enough time and power, I might crack the payload. But it’s risky—if they’re still transmitting, they’ll see me poking their message.”

Camille looked at Julien, and he saw the calculation in her eyes—the same calculation he’d been running himself. They had maybe three days of water, a compromised pharmacy, a missing neighbor, and now a potential enemy in their own walls.

“Do it,” Camille said. “But we’re not telling anyone else yet. If this gets out, the whole building will panic.”

Léa nodded, a sharp, precise gesture. “My apartment. Third floor, door at the end of the hall. Come find me before sunset—battery won’t last longer than that.”

She turned and disappeared back into the stairwell, her footsteps echoing up the concrete.

Julien looked at Camille. “You believe her?”

Camille’s eyes were dark, focused. “I believe she’s telling the truth as she knows it. Whether it helps us or not—” she shook her head. “I don’t know.”

A shout rose from the courtyard. They both turned. One of the bistro cooks was waving a ladle toward the building entrance, his face urgent. A thin plume of smoke was curling from a second-floor window.

Julien was already running, Camille a determined shadow behind him.