I just found an interesting example of interactive fiction written by Emily Short. She normally does IF in the form of text adventures but this one is unusual since it's in the form of an EPUB3 document. Liza Daly apparently did the design and technical side.
It's called First Draft of the Revolution and you can see it
here. More details at
this page; it's part three of a series apparently, though the others aren't epub.
It's actually a couple of years old but I've never seen anything about it before and searching found nothing on the forums.