The Mexican reformation outlines the early history of Mexico's Iglesia de Jesús, initially a movement of dissident priests who supported the liberal political reforms introduced by the constitution of 1857 and who opposed the papacy, the Mexican hierarchy and aspects of Catholic theology. After a rocky period of development in the 1860s and 1870s, the Church was recognised by the Episcopal Church of the United States and became part of the worldwide Anglican communion. Cruz argues that this original form of Mexican Protestantism was more an outgrowth of the enlightened Catholicism of the late colonial period than it was a transplant from the United States. Although eventually supported by Episcopalians from the north, the Church began as a reform movement inside the Catholic Church. The weakness of the work is that the history of the Iglesia de Jesús contributes only about one quarter of the text. The rest of the book is devoted to background material, a review of the historiography of Protestantism in Latin America, and proposals for new ways of writing ecclesiastical history. Truncation of these unnecessary and unhelpful sections and expansion of the actual history of the Iglesia de Jesús would have improved this book significantly. In short, this work has the feel of an insufficiently revised dissertation.