Gregor Mendel (1822 - 1884) is the father of the modern genetics. He was a Czech catholic priest who lived in the XIXth century. The film describes his struggle to change the fiscal policy applied to the monasteries in his country, his desire to make people understand his huge discovery; his beautiful spiritual friendship with the princess Hanna von Limburg. He was a man of contemplation and of action: A good priest. He is handsome, charitable and dedicated to God. Erica would like to seduce him, but Hanna is there, a good friend for both of them... She helps Erica to become a spiritual woman and shows Mendel how to spread the knowledge of his discovery all over the world.