I just finished reading Game of Shadows: Barry Bonds, BALCO, and the Steroids Scandal that Rocked Professional Sports, by Mark Fainaru-Wada and Lance Williams. If I had to describe this book in one word it would be, Wow.
This book goes into a whole lotta detail about the guy, Victor Conte, who started BALCO, and the weird twisted six-degrees-of-separation-cobweb of steroid users, makers, and distributors. Barry Bonds, of course, is stage center in this book, but also implicated in the book are a lot of other professional athletes, mainly track and field stars.
It's an easy read but incredibly fascinating and chock full of information, including grand jury testimonies that were supposed to be sealed. It makes you think twice about being a sports fan and how much you can trust the athletes that are so adored.