In the novel the author combines prose with scientific themes which shape and illustrate the story. The topic is biology. Hidden under the mask of black humour is an examination of human identity, a puzzle which is especially pertinent with new discoveries in genetics and the associated question of free will. Are we slaves to our genetic makeup? Are our thoughts influenced by parasites? Or does the society we grow up in have the greatest influence? The main character, Tomáš, a genetics student raised by adoptive parents, is searching for his own roots. Science forms his worldview, but this lens can distort his personal, especially romantic, relationships.