Hell's Angels: The Strange and Terrible Saga of the Outlaw Motorcycle Gangs

Hell's Angels is Hunter S. Thompson's best book. I think it's his only great book. Unlike his other work, Thompson stays focused on the job of uncovering a world hidden to most of us, and he does it with such powerful images and colorful language that it's impossible not to be utterly absorbed by the story he tells. I've read this twice, and I'm ready to red it again. Link