Looks quite nice imo.
One thing that might need improvement is your search. When a user searches for "Stephen King" you would expect to see Stephen King books. Maybe I am missing something obvious but I couldn't see an author filter.
People come to the site with a lot of different kinds of meta data, from publisher (don't know the name of the book, but penguin published it last month), author, partial titles, ISBN etc. Add a drop down to the search on the top right so they can search by anything quickly and easily. Users don't want to have to learn about search filters, they would prefer to use a drop down to narrow their search quickly (in my experience).
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