The Unseen Threat

Write a story where an unknown threat gradually reveals itself through a series of unexplainable events.

In this prompt, you must create a scenario that allows for an unseen and mysterious threat to the protagonist. This could be something supernatural or entirely human, but the key is that it makes its presence known without initially revealing its true nature. Exploring the gradual build-up of unease, fear and eventual panic is what will establish the suspense.