Crossing borders and boundaries, countries and cultures, they are the children of the military, diplomatic corps, international business, education and missions communities. They are called Third Culture Kids or Global Nomads, and the many benefits of their lifestyle – expanded worldview, multiplicity of languages, tolerance for difference – are often mitigated by recurring losses – of relationships, of stability, of permanent roots. They are part of an accelerating demographic that is only recently coming into visibility.

In this groundbreaking collection, writers from around the...