Book excerpt: Over the past decade and a half, girls’ involvement in the juvenile justice system has increased. Yet the topic remains under-studied among criminologists. The Delinquent Girl is a “state-of-the-field” evaluation that identifies and analyzes girls who become delinquent, the kinds of crimes they commit and the reasons they commit them. The distinguished academics and practitioners who contributed to this volume provide an overview of the research on girls’ delinquency, discuss policy implications and point to areas where further research is critically needed.