As a writer, one usually has to deal with occasional writers block. A common way to help decrease writers block is to play out a story in ones mind, letting it go which ever way it wants to.
Often times, the writer can put themselves in the story as well.

But they must remember that their 'avatar' in the story is not invernerable.
Perfectly capable of being hurt.
Perfectly capable of being killed.

Now what would happen if a writer, who put themselves into a story in which they wanted to help defeat a 'sinister darkness' from doing harm to others, tries to save everyone without looking too suspisious themselves?

Let us find out.