The Resonance Trap

Silas Mercer reads soundwaves like crime scenes. When a fatal intersection collision leaves only a corrupted dashcam audio file, he isolates a subsonic pulse buried beneath the screech. It's not a glitch. It's a command. Tracing the frequency through city traffic grids, he realizes the infrastructure itself is being weaponized. Now the network knows he's listening. The streetlights flicker. His phone vibrates in perfect sync.
The hunt has shifted from the streets to the air around him.