Assumpta Serna stars as the brilliant and beautiful poet Sister Juana Inés de la Cruz in this magnificent portrayal of 17th Century Mexico. In order to pursue her love of writing, Juana enters the convent and gains international renown. When the Inquisition comes, the local Vicereine becomes Juana's protectress and erotic muse, and soon begins a thrilling romance of startling passion and intensity.

A new patient mysteriously appears in a psychiatric ward. He claims to come from another planet to study humans and their behavior. The alien is gentle but criticizes humans for their harsh treatment of each other. The assigned psychiatrist is himself unhappy, and affected by the patient's insight. But he is ordered to treat the patient according to institutional procedure.