Do states have the right to prevent potential immigrants from crossing their borders, or should people have the freedom to migrate and settle wherever they wish? Christopher Heath Wellman and Phillip Cole develop and defend opposing answers to this timely and important question. Succeed[s] in exploring the moral dilemmas surrounding immigration in an accessible way. The book consists of two essays: Wellman makes the case for the right to exclude, Cole for a human right to cross national borders. Their study shows vividly how a profound difference of opinion can be clarified by reasoned dialogue, which makes it a lesson in philosophy as democracy.