Pope Benedict XVI and Pope Francis have each approached the papacy in strikingly different ways, yet they share the same fundamental vision of the world and man. In these pages, Cardinal Muller, Prefect of the Congregation for the Doctrine of the Faith, explores the differences and commonalities of these two popes, showing how the challenge for the Church's hierarchy remains the same, and how these two popes are leading the Church to resist worldly infections and to heal the spiritual diseases of our time.

He also provides a succinct and fascinating look into the universal ministry of the Church, showing how the popes, as successors to Peter, are the visible head of the pilgrim Church and are tasked with carrying out the pastoral ministry of Christ.