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In this offbeat mixture of horror and sex from Mexico, Sister Maria (Cecilia Pezet) is a nun who is recognized in her community for her personal warmth and her sincere desire to help others less fortunate than herself. However, Sister Maria is still a woman who is sometimes haunted by the desires of the flesh, and one day while hiking through the forest near her convent, she is approached by a naked man with evil on his mind (Enrique Rocha), not realizing he is an emissary of Satan. The devilish man soon becomes Sister Maria's constant tormenter until she is tempted to succumb to his advances.