Siren and saint, hedonist and penitent, Mary of Egypt was a woman of extremes. A runaway at the age of twelve, she ventured to Alexandria to begin a life of reckless promiscuity. But a pilgrimage to Jerusalem brought about an inward change that drew the adult Mary into wilderness and solitude. From the monasteries of fifth-century Palestine to medieval Europe, the fame of this Desert Mother gradually spread--by both the written and the spoken word,...