A good overview of a topic that I've always found fascinating. Human nature, eh, the want for drama and excitement and salaciousness.
It's not a very long book and it covers a relatively broad range of athletes/sports, but it still felt somewhat too long and stuffy to me.
Honestly, if, like me, you're mostly interested in cycling: I'd recommend listening to the Roadman podcast's two-part interview with the author instead, you'll get most of the interesting bits and some good additional discussion.