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This retelling of a popular legend, based on a radio drama scripted by Juan Carlos Chiappe, was tremendously popular throughout Argentina when it was released in 1974. Nazareno Cruz is the seventh son of a couple living in a high mountain village. According to folklore, a seventh son will become a wolf on nights of the full moon. Everyone in the village is relieved when this doesn't happen. The boy grows up and falls in love with a beautiful girl, Griselda. Around his 20th birthday, he is visited by the Devil, who offers him the wealth of the world if he will turn his back on his love for Griselda; if he fails to do this, he will certainly become a wolf. Nazareno bravely chooses to continue in his love, and duly turns into a wolf. While he is being hunted down by the villagers, he is led to a mysterious cavern where the Devil again appears. Nazareno is told that he will be killed, but because of his goodness he will go to heaven. The Devil wants a message delivered to God: he's tired of being the bad guy on earth and wants to retire.