Regarding the story:

This story carries multiple layers of interpretation, but one central theme could be the consequences of mistrust and betrayal. Here are some possible morals or insights:

Betrayal destroys relationships: The friends' gossip about the fourth friend leads to an eerie and supernatural twist, symbolizing how betrayal can isolate individuals emotionally or even metaphorically consume the betrayers.

The power of perception and reality: The friends assumed the fourth friend was hiding something, but their assumption turned into their doom. This highlights how judgment without understanding can lead to unexpected consequences.

Guilt as a haunting force: Their guilt may have manifested in their surreal disappearance, symbolizing how guilt and regret can trap individuals in a metaphorical void.

Karma?: The story implies a karmic twist—what they did to her (hiding truths or betrayal) turned back on them in a way they couldn’t escape.""

The story flips the perspective, making readers question what "missing" truly means and whether their own actions can lead to their downfall.

The title: The walls listen" or "walls have ears" is an idiomatic expression that means someone might be secretly listening to your conversation, even in places you assume are private. It serves as a cautionary reminder to be careful about what you say, especially when discussing sensitive or secretive matters, as you never know who might overhear or be aware of it.

Historically, it emphasizes the need for discretion and vigilance, often in contexts involving trust, gossip, or surveillance.