The Art of War- Sun Tzu.
I've heard about it for a long time and always wanted to read it, and it's really worth the hype. I have an abridged, translated version. It's now my favourite book. The philosophies in this book can relate to so much different aspects of life, not only war, but everyday life, business and sometimes even football. The guy that wrotethis book, Sun Tzu is a genius.