Andriani Fili is a Research Associate at the Centre for Criminology, University of Oxford, and a doctoral researcher at Lancaster University, UKSynnøve Jahnsen is a Postdoctoral Research Fellow at the Uni Research Rokkan Centre, NorwayRebecca Powell is the Managing-Director of the Border Crossing Observatory, Monash University, Australia

• Criminal justice research in an era of mass mobility: A brief introduction, Mary Bosworth, Katja Franko and Sharon Pickering, Part 1: Producing and presenting knowledge in an era of mass mobility. 1. Taking the border for a walk: A reflection on the agonies and ecstasies of exploratory research, Leanne Weber, 2. Manoeuvring in tricky waters: Challenges in being a useful and critical migration scholar, May-Len Skilbrei, 3. ‘‘Crimmigration’ statistics: Numbers as evidence and problem, Synnøve Jahnsen and Kristin Slettvåg, 4. Funnel politics: Framing an ‘irreal’ space, Nicolay B. Johansen, Part 2: Epistemological and methodological accounts in practice. 5. Expectations and realities of fieldwork by a nascent qualitative researcher, Brandy Cochrane, 6. Spotting foreigners inside the courtroom: race, crime and the construction of foreignness, Ana Aliverti, 7. Migrant voices in the Global South: Challenges of recruitment, participation and interpretation, Bodean Hedwards and Sirakul Suwinthawong, 8. Life and death in immigration detention, Dominic Aitken, 9. The challenges and opportunities of researching life after immigration detention, Sarah Turnbull, Part 3: The politics of positionality, ethics and emotions. 10. Researching vulnerable women: sharing distress and the risk of secondary and vicarious trauma, Alice Gerlach, 11. In the absence of sympathy: Serious criminal offenders and the impact of border control measures, Rebecca Powell and Marie Segrave, 12. Turning researcher position into theorizing: Conceptualizing the police role in migration control, Helene O. I. Gundhus, 13. Race at the Border, Alpa Parmar, 14. One of us or one of them? Researcher positionality, language, and belonging in an all-foreign prison, Dorina Damsa and Thomas Ugelvik, 15. Voices in immigration detention centres in Greece: Different actors and possibilities for change, Andriani Fili, Criminal justice research in an era of mass migration: Concluding remarks, Synnøve Jahnsen, Rebecca Powell and Andriani Fili