I really enjoyed the book on Fermat's last theorem by Simon Singh -
http://www.amazon.com/dp/0802713319
A long time ago, a friend's mother was complaining to me that (high school) Math is a dry subject and she doesn't blame her otherwise intelligent son for not being able get interested and do well in it. I wish I knew of this book then - I know it cranked up my interest in Math ever since.