I wouldn’t be entirely surprised if this was about Henry, not Emma.
That would be interesting. Maybe S6’s ‘big bad’ does something to Henry which messes with his mind somehow. It could be because they want to block or control Henry’s author powers. Perhaps there is a story they don’t want him to write about, hence the title ‘An Untold Story’.
Henry is due for some action in S6. He’s been doing a bit of author stuff lately, but nothing major. I’d like to think that they are setting him up for a much larger role in the next arc.