This book traces the history of the "Church Crisis", a conflict between the Protestant and Anglo-Catholic (Ritualist) parties within the Church of England between 1898 and 1906. During this period, increasing numbers of Britons embraced Anglo-Catholicism and even converted to Roman Catholicism. Consequent fears that Catholicism was undermining the "Protestant" heritage of the established church led to a moral panic.

The Crisis led to a temporary revival of Erastianism as protestant groups sought to stamp out Catholicism within the established church through legislation whilst Anglo-Catholics, who valued ecclesiastical autonomy, opposed any such attempts. The eventual victory of forces in favor of greater ecclesiastical autonomy ended parliamentary attempts to control church practice, sounding the death knell of Erastianism. Despite increased acknowledgment that religious concerns remained deep-seated around the turn of the century, historians have failed to recognize that this period witnessed a high point in Protestant-Catholic antagonism and a shift in the relationship between the established church and Parliament. Parliament's increasing unwillingness to address ecclesiastical concerns in this period was not an example advancing political secularity. Rather, Parliament's increased reluctance to engage with the Church of England illustrates the triumph of an anti-Erastian conception of church-state relations.