Book excerpt: Opening with a discussion of the key issues of globalization, migration, multiculturalism, multilingualism and global cities, David Block then turns to four detailed case studies: East Asian students living and working in London; foreign language teachers from France; London's growing Latino community; and second generation South Asian university students. Via these case studies the book explores the ambivalent and multi-layered identities of individuals who have crossed geographical and psychological borders during the course of their lifetimes and settled in London, the quintessential global city.