This work investigates how prophetic discourse functioned as a mechanism for challenging institutional power structures within the late fourteenth-century Catholic Church. Frances Courtney Kneupper, a scholar of medieval religious history, utilizes a wide array of primary sources—including trial records, prophetic texts, and ecclesiastical correspondence—to analyze how marginalized figures utilized the language of divine revelation to assert authority. The book argues that prophecy was not merely a fringe phenomenon but a potent political tool used by outsiders, women, and reformers to critique the papacy and advocate for institutional change during a period of significant religious instability.

Historians and scholars of medieval religion frequently cite this text for its rigorous examination of how prophetic authority was contested in the late Middle Ages. Experts highlight the book as a significant contribution to the study of religious dissent and the role of marginalized voices in shaping ecclesiastical discourse.