Don't be deceived by the cheesy tabloid cover. Jon Ronson's "Them," though written almost 20 years ago, is one of the most relevant and illuminating books about where we are and how we got here. Through whimsical and at times self-deprecating reporting, Ronson steps into the inner circles of extremist groups, from the KKK, to Islamic fundamentalists, to Hollywood, and even Alex Jones's home office (with its choo-choo train wallpaper). As Ronson said on Twitter recently, "All the worst people I interviewed back in the 1990s have power now. Omar Bakri's group. The KKK. The DUP. Alex Jones." This book is a hilarious but haunting roadmap to where we are today. The extremists have become the mainstream.