A young Croatian woman travels to Medugorje in Bosnia and Herzegovina, site of apparitions of the Virgin Mary, where she meets an angel and witnesses a miracle. Twenty years later, after living in a cloistered convent, she travels to Rome where her habit of prayer transforms the lives of seven strangers. Their stories intertwine and connect in this portrayal of several Roman churches, the art of Bernini, Caravaggio, and Borromini, and Rome's rich architectural history.