The prison is a recent invention, hardly more than two centuries old, yet it has become the universal system of punishment. How can we understand the place that the correctional system occupies in contemporary societies? What are the experiences of those who are incarcerated as well as those who work there?

To answer these questions, Didier Fassin conducted a four-year-long study in a French short-stay prison, following inmates from their trial to their release. He shows how the widespread use of imprisonment has reinforced social and racial inequalities and how advances in civil...