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During the full moon, a mystical blue light emanating from a grotto high in the Alps draws men to their deaths.
What causes this beautiful blue light – only the gypsy girl Junta (Leni) can climb to this strange grotto.
Another young man has fallen to his death and the villagers attempt to stone her but a handsome stranger comes to the village in time to save her, and is smitten by her beauty.
She brings him to her little cabin in the high Alps.