OK before I go too far, I'll admit that I only had a very quick play with Google Books.
I searched for a few books from series that I'm currently reading and was disappointed. Trying title, author and series titles there were no hits for my book, which is from a popular series. It did however bring up some similar titles. Although they seemed a bit dated. For now I'll probably stick with other sources when searching for books, but I will come back in the not-too-distant future and have a better look to see if I missed something here.