Book suggestions

Thanks to generous friends & family, I have received (and will probably receive a few more on Christmas morn) gift cards for Barnes & Noble. Please leave a comment and let me know if there has been any book or books that have had significant impact on your faith. Or, you can just leave a suggestion for a book that was a fun and/or interesting read. Fiction is fine - I normally read sci-fi, but I'm trying to branch out - so suggest away!!