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Fernando and Rafael are young students at a boarding school close to a lake. Fernando is the most daring of the two and has heard of an abandoned house with a hidden treasure. His friend Rafael is a little shy, and he looks surprised and nervous when Fernando asks him to go with him to look for the mysterious treasure, with the promise of one half of the wealth that they find. On the day of the adventure, they tell everyone at school that in the afternoon they are going for a walk. This announcement surprises everyone because the two boys don't like to leave school nor take long walks. Two of the teachers, Antonio, and Santiago, look surprised and suspect that the young students are hiding something. It can also be dangerous because it's getting windy, and a storm seems to be coming because the sky is full of dark clouds, and they are quickly approaching. When they arrive at the abandoned house, they sneak in through a window, and are welcomed by strange sounds and dark shadows that move mysteriously and rapidly from one room to another. This frightens the boys, but they insist and continue looking for the hidden treasure.