Book excerpt: Although humans have always migrated, the present phenomenon of mass migration is unprecedented in scale and global in reach. Understanding migration and migrants has become increasingly relevant for world Christianity. This volume identifies and addresses several key topics in the discourse of world Christianity and migration. Senior and emerging scholars and researchers of migration from all regions of the world contribute chapters on central issues, including the feminization of international migration, the theology of migration, south-south migration networks, the connection between world Christianity, migration, and civic responsibility, and the complicated relationship between migration, identity and citizenship. It seeks to give voice particularly to migrant narratives as important sources for public reasoning and theology in the 21st century.