This story is a sequel to Silent Ponyville
Octavia is being tormented by horrific nightmares. No longer able to deal with them by herself, she seeks out the help of her sister.
After all, Pinkie had suffered from nightmares just like this, so she must know how to get rid of them. But will that have been the best decision when she finds herself alone in an abandoned, fog filled Ponyville?
Silent Ponyville 4 is a DIRECT sequel to Silent Ponyville . You do not have to have read Silent Ponyville 2 or 3 to understand this story as events from those stories are not referenced. Spoilers for Silent Ponyville if you don't read it first.
Significant Note: The Silent Ponyville Universe follows a pre-Season 2 headcanon that Pinkie Pie and Octavia were sisters (as Octavia's colors looked very similar to Marble Pie's as a filly). So sorry if that is confusing to newcomers to the story!
Audio Book Version Here: https://www.youtube.com/watch?v=DbRIyRQZ9Iw