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immigration regime variation is to be found, what exactly varies and why. As striking as this desired comprehensiveness might be, the strength of the book stems, from my reading, rather from the ability to in a systematic manner accommodate topics that otherwise easily end up in the periphery, such as the implications of regulation of migration for ethnicity and gender. Less systematically and more ad hoc, the discussion also manages to be mindful of the ambiguities of migration categories alongside their virtues, when for example considering how temporary and permanent classifications might unfold differently than intended, or acknowledging the links between absence of conversion possibilities and undocumented migration. All in all, Crossroads enriches the study of immigration demography and politics with a book that one can consult again and again when wanting teach about immigration regimes, debate whether there is a global push to limit immigration or rethink the applicability of other well-established classifications of immigration regimes.