Leading migration researcher Louise Ryan’s topical and intersectional book provides rich insights into migrants’ social networks. It draws on more than 200 interviews with migrants who followed various transnational routes in every decade since the 1940s, in order to build valuable longitudinal perspectives and comparisons. With a particular focus on London, it charts how social networks are formed and sustained, how trust is developed and how social support is accessed, and explores the key opportunities and obstacles that migrants encounter. This is a seminal fusion of migration studies and social network analysis that casts new light on both subjects, essential for those interested in immigration, ethnicity, diversity and inequalities.