Silent Frequency: a Silent Cry for Help

Modern, realistic suspense, socialist, strong plot. It's not a supernatural novel, it's not a cool novel, but a contemporary novel that uses "voice" as its sword and "forgotten people" as its bones. Using the emergency dispatcher's ear as a probe, he opened up the deregistered living persons, the tampered vacant roster, and a concealed work injury ten years ago in an old factory to be demolished.