Brilliant and talented, young Joan rebels against medieval social strictures forbidding women to learn. When her brother is brutally killed during a Viking attack, Joan takes up his cloak–and his identity–and enters the monastery of Fulda. As Brother John Anglicus, Joan distinguishes herself as a great scholar and healer. Eventually, she is drawn to Rome, where she becomes enmeshed in a dangerous web of love, passion, and politics. Triumphing over appalling odds, she finally attains the highest office in Christendom–wielding a power greater than any woman before or since. But such power always comes at a price.