Las Encinas is the best and most selective school in Spain, and it is also the place where the children of the elite class go to study. After an earthquake destroyed a civilian school, the local council decided to divide the students among local schools, and three children from working-class families came to this aristocratic school. The poor children who had nothing met the rich second generation who had everything, and a fierce conflict broke out, which eventually led to murder. So, who is the culprit?