The chamber beneath the Mississippi River levees was warm and damp and smelled of wet concrete and old copper. Cecilia Duval ran her hand along the wall, feeling the vibration of the induction coils that lined the chamber like the ribs of some enormous mechanical creature. She had been told this was a flood control project. She was starting to suspect she had been lied to.

Silas Montgomery was waiting for her, surrounded by blueprints and oscilloscopes and a cup of coffee that had gone cold three hours ago. He was forty-one, with the calm, rational demeanor of a man who trusted equations more than people. Cecilia liked him immediately. She also suspected he was about to be deeply, profoundly wrong about something.

"Miss Duval," he said, looking up from his work. "Thank you for coming. I understand you have experience with high-voltage systems."

"I do. My grandfather was an electrician. I grew up watching him fix things that other people said were beyond repair."

"Excellent. This project requires exactly that kind of thinking. The equipment we're working with is... unconventional."

Cecilia looked at the coils. They were massive, each one the size of a wine barrel, wrapped in copper wire and connected to a bank of vacuum tubes that hummed with a frequency she could feel in her teeth. "What does it do?"

"It generates an electromagnetic field. A very strong one. The theory is that if we can create a field of sufficient intensity, we can disrupt radio communications within a fifty-mile radius."

"Military application?"

"Federal emergency management. Flood warning systems can be disrupted by severe weather. We're building a countermeasure."

She nodded. It was a plausible explanation. It was also, she suspected, a lie. But she was a contractor, not an investigator. Her job was to make the equipment work, not to ask why it existed.

The first test was scheduled for three days later. Cecilia arrived early, as she always did, and began running diagnostics on the power supply. Silas arrived ten minutes later, carrying a clipboard and a look of concentrated anxiety that Cecilia had come to recognize as his version of relaxed.

"Ready?" he asked.

"As I'll ever be."

They activated the device. The hum deepened. The coils glowed a faint orange. Cecilia watched the gauges and confirmed that the electromagnetic field was spreading outward as predicted. Radio communications within the facility went silent. She picked up a landline phone and heard nothing but static.

"It worked," Silas said, making a note on his clipboard.

"It worked," Cecilia agreed.

Then the maintenance worker in the corner dropped his coffee cup.

"Did you hear that?" he asked.

"Hear what?" Cecilia asked.

"A voice. Someone was calling my name."

Silas looked up from his clipboard. "Hearing things is a common side effect of electromagnetic exposure. It passes."

The worker shook his head. "It wasn't in my head. It was in the walls."

Cecilia felt a chill that had nothing to do with the temperature. She had grown up in New Orleans, surrounded by her grandmother's stories of Voodoo and spirits and the things that lived in the spaces between reality and belief. She didn't believe in ghosts. But she believed in electricity, and electricity was strange in ways that science had not yet explained.

Over the next week, more workers reported symptoms. Headaches. Vivid dreams. The sensation of being watched. One woman swore she saw her dead mother standing at the end of the corridor. Silas dismissed it all as stress and fatigue. Cecilia took notes.

On the eighth day, Silas called her into his office, which was a concrete room filled with recording equipment and graphs and equations that made her head spin.

"I've been analyzing the electromagnetic readings," he said, his calm demeanor finally cracking. "The field is not just disrupting radio communications. It's resonating with human brain waves. It's amplifying neural activity and projecting it outward."

"What does that mean?"

"It means the device doesn't just jam communications. It projects thoughts. When activated at full power, it will project the thoughts of everyone within range, creating a feedback loop of collective hallucination."

Cecilia stared at him. "You're saying this thing turns people insane."

"I'm saying it does something we don't fully understand and may not be able to control."

"How do we stop it?"

"We can't. Not yet. If we shut it down mid-test, the sudden collapse of the field could cause... unpredictable effects. We need to let it run its course."

"And if the workers can't handle it?"

Silas looked at her with eyes that were suddenly very old. "Then they can't handle it."

Cecilia made her choice that night. She went to the control room, bypassed the safety protocols, and shut down the device. The hum died. The coils stopped glowing. The silence that followed was absolute.

The workers who had experienced the resonance would never be the same. Some of them quit. Some of them stayed, haunted by voices that had no source. Silas published a paper that got him blacklisted from academia. Cecilia returned to the power company, but she could not stop hearing the hum.

Sometimes, in the quiet moments, she thought she could hear thoughts that weren't hers.

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