Mikolaj Kopernik, son of a Torun merchant, is a bright and world-curious child. When he is ten, Dutch astrologer Paul van de Volder predicts a great future for him, developing a great interest in the stars in the boy. Paul van de Volder reappears in Mikolaj's life when he is already a student of the Jagiellonian University in Krakow. A struggle for the student's soul begins between the astrologer - a charlatan, and Wojciech from Brudzew and other university professors. Astrology fights astronomy. From the doubts and questions that arise from Mikolaj, a discovery is born that will change the world.