In the 9th Century, Pope Joan wore the Holy robes for more than two years before her deception was dramatically revealed. At least that's what legend and hundreds of medieval records claim. The story of her papal rise and fall - when she gave birth in public on a street in Rome - has plagued the Catholic Church and confounded researchers for centuries. Did Pope Joan really exist, and if not, who created her and why? Historians and theologians analyze the archives and investigate the artifacts to answer this gender-bending mystery.