In the aftermath of tampering with the noise-creating SOAPS stuck on her ears, Sadie hears a voice in the silence. Her reality shatters as she's forced to find the truth about the noise and her city. But what she knows for sure is that someone-or something-lives outside the glass box of Cybercity. And it wants to talk to her. With the sudden disappearance of Jaesun, her only friend and confidant, Sadie must learn the truth on her own. Is Cybercity keeping them safe or captive?