I read all kinds of books (one of my friends jokes that I will read anything that holds still long enough), but sci fi/fantasy is my favorite. I also love books on anthropology and archaeology and other sciences.
This is a really in depth look at curry. I love how the book breaks down recipes from all the regions of India, as well as Filipino, Indonesian, and Thai recipes. It breaks down the ingredients from each region and explains what they are and what flavors are comparable.