This article presents a review on "Defining deviance: sex, science, and delinquent girls, 1890-1960," by Michael A. Rembis. This is the first book by Michael A. Rembis, an Associate Professor and Director of the Center for Disability Studies at the University of Buffalo. Drawing on thousands of case files from the Illinois State Training School in Geneva, Rembis examines the social and scientific discourses that classified, pathologized, and institutionalized delinquent girls in an attempt by reformers to "rebuild the nation." Through his analysis, Rembis reveals "the centrality of sex, class, gender, and disability in the formation of both scientific and social reform discourse". With only minor missteps, this work substantively contributes to Disability Studies through its compelling firsthand narratives and thought-provoking analyses.