I believe the Book Shelves function, or more specifically the individual book pages themselves (especially from the reader perspective) could use some love!
First of all, the cover image seems to be a blown up low resolution thumbnail, even while a high resolution image often can be found on one of the linked services. A high resolution, full width image would be so much nicer!
Secondly, the “View on…” buttons could just as easily be on the bottom of the page. Because the first thing a reader wants to read is the book description / summary. Only after reading that info, a “view on…” button really makes more sense.
Finally, a small segment on the top of the page with minimal generic book info like title, author and publishing date would give each book page the attention it deserves!