http://www.warez-bb.org/index.php
This is where you should always go first for anything (movie, tv show, eBook, software, etc).
If you can't find it there, then Google is your friend.
Just search: "<book title>" rapidshare
Have the book title in quotes. If you need to narrow the search down because the book title is the same as a movie title and you get results mostly for the latter, then include the author's last name or even the word "ebook" in the search query.
You'll get a lot of shit results, but you'll learn to spot the good ones. The term "rapidshare" will bring up pages that have a download link for nearly any file storage site, not just Rapidshare.
This is really, really simple.
But the fact that you had to ask and don't even know of warez-bb.org's existence isn't a good sign.