This powerful and reflective book explores the losses encountered during social research—of people, communities and environments—collectively referred to as The Lost. Drawing on the contributors’ varied research experiences, it gives voice to lives marked by marginalisation, trauma or quiet disappearance. Stories emerge from women who didn’t survive domestic abuse to those displaced by ‘natural’ disasters, or affected by homelessness. Through deeply personal and ethical reflections, each chapter considers how these losses shape both research and researcher. Offering new insights into harm, reflexivity and the emotional toll of fieldwork, this is an essential contribution to critical criminology and social research methodology.