The largest human migration in history is taking place in China today--incredibly, off the radar of the world's major media. Since the 1990s, at least 120 million Chinese peasants have left the countryside for big cities to work in factories, on construction sites, in catering and prostitution--typically without even the most basic rights or protections. In A Floating City of Peasants, Floris-Jan van Luyn--who spent six years reporting...