Dr. Martha Livingston is a psychiatrist who has been asked by a court to investigate the events that took place in a convent, where a young nun, Sister Agnes, gave birth to a baby, who died shortly afterwards. Sister Agnes insists that she became pregnant in an immaculate way, without losing her virginity, after receiving the visit of God. Dr. Livingston examines Agnes and appreciates in her a vision of life far from reality. The doctor’s interest lies in clarifying the facts and helping the naive nun. Its purpose is met with the opposition of Mother Superior Miriam Ruth, in favor of not disturbing the young woman more. These conflicting convictions lead the two women to maintain a confrontation. In addition, during his investigation, Livingston finds indications that in the convent other strange events take place.