In an old villa, on the outskirts of a town in western Poland lives professor of philosophy with his sister. Sister mostly performs duties of a housekeeper, she is totally subordinated to her brother. Professor graduated from the University in Berlin and is still associated with his Alma Mater where he gives regular lectures. Mutual relations between brother and a sister are bizarre and morbid. Professor treats his sister like a maid and a servant, but also like auditorium for his philosophical arguments. One day the Professor brings home twelve years’ old girl and tells the sister to close her in the basement. From that moment relationships between the brother and the sister change dramatically. She uses the situation to gradually gain power over her brother. She makes final and irreversible decision how to get out from this situation.