Book Idea?

I have moved away from keys a bit, more towards security.
I think i am going to do a book, that has lots of levels of security - this could be many layers, use of padlocks and boxes. So that it is an interaction for the viewer to try and gain access to the book - as this is the point of security and keys - to control access to buildings and objects.
Inside i think i will have either a really simple book, maybe even a blank book - just for impact. It is also quite ambiguous, the viewer can make up their own interpretation of what the piece is all about.
Or, inside i could have a book, make up a series of peep/key hole images, referring to the idea of invasion of Privacy.