What happens when people cross borders to learn and then return to the worlds that shaped them? This book follows 391 returnees from sixty-nine countries to show how international higher education reshapes how individuals see, judge, and engage in their societies. Drawing on vivid cases from education, health, poverty, and democratic life, it traces five generative mechanisms-reflexive agency, civic understanding, knowledge translation, transnational social relations, and intercultural understanding-through which comparative experience becomes consequential after return. Grounded in critical realism, transformative learning, and transnational theory, the book introduces a new framework centred on presence: a sustained relational stance through which individuals hold their ground under constraint. It offers an empirically rich account of how international study widens interpretive horizons, sustains engagement, and keeps democratic and institutional possibility open even in settings marked by inequality, fragility, and uncertainty. This title is also available as open access on Cambridge Core.