In this well-researched study, Johan Tredoux deftly recounts Dr. Wynkoop's life and contribution to Wesleyan-Holiness studies. Emphasizing her theological development, Tredoux explores Wynkoop's gradual move to a dynamic, relational, and christological understanding of sanctification. Scholarly yet readable, this volume is an outstanding addition to the library of any student of Wesleyan-Holiness theology. Combined with a glossary and an index, this book is an essential read and an invaluable stepping stone for further study.