When a young American woman is sent to Rome to begin a life of service to the church, she encounters a darkness that causes her to question her own faith and uncovers a terrifying conspiracy that hopes to bring about the birth of evil incarnate.

It is the end of World War I and the young Italian soldiers are making their way back to San Giovanni Rotondo, a land of poverty, with a tradition of violence and submission to the iron-clad rule of the church and its wealthy landowners. Families are desperate, the men are broken, albeit victorious. Padre Pio also arrives, at a remote Capuchin monastery, to begin his ministry, evoking an aura of charisma, saintliness and epic visions of Jesus, Mary and the Devil himself. The eve of the first free elections in Italy sets the stage for a massacre with a metaphorical dimension: an apocalyptic event that changes the course of history.