Cities, more than ever, are the engines of our economies and the ecosystems in which our lives play out. This means that questions about the perfectibility and sustainability of urban life are all the more urgent. Joe Berridge takes us on an insider's tour of the world's largest and most diverse cities, from New York to London, Shanghai to Singapore, Toronto to Sydney, to examine what is working and not working, what is promising, and what needs to be fixed in the contemporary megalopolis. We meet the people, politicians, and thinkers at the cutting edge of global city making, and share their struggles and successes as they balance the competing priorities of growing their economies, upgrading the urban machinery that keeps a city humming, and protecting, serving, and delighting their citizens.