A seemingly friendly new upstairs neighbor, Daniel, turns out to be a nightmare for the letter writer, who is a freelance writer living a quiet life. Despite the letter writer's attempts to minimize noise, Daniel repeatedly accuses them of being too loud, escalating his complaints to the building management and leaving accusatory notes. Things take a sinister turn when the letter writer begins hearing strange noises in their apartment, including recordings of their own conversations.

The letter writer discovers hidden recording devices in their apartment and contacts the police. However, the harassment escalates to cyberattacks, with their email and social media accounts compromised. Daniel even files a restraining order against the letter writer, filled with fabricated claims, and the judge grants it.

Forced to move, the letter writer finds that the nightmare continues at their new address, with anonymous mail and disturbing packages. A private investigator hired by the letter writer discovers that "Daniel" is actually named David and has a history of targeting individuals in this way. Though “David” disappears, the letter writer is left traumatized, eventually changing their identity and relocating to attempt to escape the psychological trauma. The writer shares their story to warn others and offer hope to those who may be experiencing similar situations.