If you want a site that gives you things like IMDB would provide, only for books – off the top of my head that would include things like character lists, plot summaries, release dates, reviews, etc., etc. – the short answer is no. I think it would be too difficult to assemble all (or even part) of that information for every title published.
I think the closest thing we have available is Wikipedia, and there you will only find entries for books with a great enough reputation (whether good or bad, influential in some way, or just popular) to be included. So, for example, here’s a page for The Great Gatsby.
The other sources listed here are at least equally incomplete, and don’t forget to take anything on Amazon with a grain of salt – often, they attach reviews or other information that pertains to different editions than the one you’ve looked up, even when using that trusty ISBN.