One of the students of the men's middle school, Adaś Cisowski, a noble boy with a keen mind, stands out for his extraordinary ability to think logically. For this reason, he is called Satan by his colleagues. We meet his family: his doctor father, his affectionate mother and his crazy, much younger siblings. We also see that Adam's thoughts run towards the female middle school, where the beautiful, athletic and extremely self-confident Sophie Gorska reigns supreme. The plot of ‘Satan...’ takes place during the holidays in an old palace somewhere in the Polish countryside. Adaś stumbles upon a treasure trove hidden somewhere in the area by a Napoleonic soldier. At the same time, a group of dangerous criminals also fell on the trail of the treasure.