A widowed American psychiatrist without children is called to a wealthy farm in Columbia to solve the case of a disturbed child. The child’s mother, concerned about the increasingly persistent accusations from the local priest and tormented by mysterious adverse events, had contacted her, fearing that her son might be the devil. When the doctor arrives, she discovers that the boy’s mother has died, and the father himself has begun to believe in the child’s possible possession. As the woman attempts a psychoanalysis of the young patient, the ominous events intensify, and her “treatment” becomes a race to save the child from the fury of the townspeople… and perhaps even from himself when she herself begins to fear that what is happening in the “hacienda” is connected to something horrific and supernatural.