What happens when a migrant seeks to cross a border without authorization? This book argues that the ancient virtue of hospitality, with its philosophical and legal roots, offers the most compelling framework navigate the tension between migrants’ rights and state sovereignty, for it respects migrants' dignity while accommodating legitimate limits on admission. Drawing on landmark ECtHR rulings and a US comparative analysis, it examines how reasonable proposals of migration management need to incorporate both poles of the discussion. Readers will find a rigorous yet accessible guide that brings together authors like Vitoria, Kant or Derrida with live jurisprudence, equipping scholars, practitioners and policymakers with tools that neither philosophy nor law alone can provide.