Is Opus Dei a spiritual institute dedicated to preserving Catholic orthodoxy in the face of modernist assault? Or is it an independent society, a "church within the Church," promoting its own allegiances and preserving an antiquated set of spiritual and penitential practices?

This small organization wields enormous power within the Catholic Church. Due to its status as a "personal prelature" of the pope, it operates independently of local Church authority. The influence of Opus Dei has only grown since this book first appeared.