Not really an ebook but an example of 'digital poetry'. Available at http://www.dreamingmethods.com/theflat/ this is an interactive multimedia work where you explore various areas of a rather forlorn and uninviting flat by clicking on various areas of the screen to navigate. There are seemingly random or un-related phrases of text scattered throughout the space to read as well.
You have two minutes to work your way through the environment to uncover the story. This adds a gaming element that I found distracting and not really intuitive. If it was supposed to be challenging I guess the challenge was somewhat lost on me an I didn't really gain any appreciation of the work or enjoy it in any way.
As a first experience of this type of work I found it quite underwhelming and if I was to introduce it into any classroom setting I would probably think quite seriously about what sort of preparation the class might need to do to gain from experiencing it.
As a 'gaming' experience it was kind of all or nothing with no interim rewards or recognition that I could find. I found myself 'hunting' and trying to complete the task within the two minutes rather than taking in the experience of it.
The author's website, which is accessible from 'The Flat' contains other examples of this type of work which might be worth a look.