Guardian journalist Jon Ronson's Them began as a book about different kinds of extremists, but after Jon had got to know some of them - Islamic fundamentalists, neo-Nazis, Ku Klux Klansmen - he found that they had one oddly similar belief: that a tiny, shadowy elite rule the world from a secret room. In Them, Jon sets out, with the help of the extremists, to locate that room. The journey is as ...