"Carens begins by focusing on current immigration controversies in North America and Europe about access to citizenship, the integration of immigrants, temporary workers, irregular migrants and the admission of family members and refugees. Working within the moral framework provided by liberal democratic values, he argues that some of the practices of democratic states in these areas are morally defensible, while others need to be reformed. In the last part of the book he moves beyond the currently feasible to ask questions about immigration from a more fundamental perspective. He argues that democratic values of freedom and equality ultimately entail a commitment to open borders. Only in a world of open borders, he contends, will we live up to our most basic principles."