Migration journeys are arduous, with migrants tormented by risk, abuse, threats, and xenophobia. Shelters, staffed by humanitarian workers and volunteers, provide safe spaces for those in transit. Shelter on the Journey examines how these sites, often faith-based civil society associations, create solidarity and help politicize migrants, giving them a sense of themselves as an empowered, rights-holding people. Solano, who volunteered at shelters in Mexico, chronicles the activity in three of the nearly 100 shelters along a unique humanitarian trail that many Central Americans take to reach the United States. She outlines the constraints faced by these sites and their potential to create social transformation and considers how and why migration security is currently framed and managed as both a criminal and humanitarian issue. Shelter on the Journey explores the politics of the shelters, their social world, and the dynamics of charity and solidarity, as well as the need for humanitarian assistance and advocacy for dignified and free transit migration.