How about finding a new template (WordPress theme)?
I agree with you that the current theme is not a good theme for that site.
The sliding navigation and layout is very annoying and distracting.
I suggest that you find a WordPress Book Club Theme ... something like these:
Make it easy to search, and easy for users to review books.
You can even add a MOBI section for eBook readers (Nook, Kindle, Etc).