Decalogue 4 is about a girl Anka and her father Michal who share a playful relationship full of fun. They care for each other and would go to any extent in order to prevent any harm to either of them. However, as all relationships are stable before the discovery of a secret, Anka and Michal have serious misgivings about their relationship when they discover a secret in the form of a mysterious letter addressed to Anka which was written by her mother. The effects are serious with far reaching consequences for them : Anka allows restlessness to settle in herself whereas Michal is merely able to explain that he wanted to tell her about the secret but could not do it due to the age difference. It is quite evident that here Kieslowski seems to be questioning the validity of a relationship whose success or a failure depends on a secret. Hence, we get a clear view of the relationship before the secret and the relationship after the secret. Decalogue 4 is about what it means to be a father as girls view their father differently from how they consider their mothers. One of the most puzzling episodes of ten commandments, Decalogue is the most mature episode due to its mature content. It has ethical implications too as it is a good mix of truth and lies. Lastly, Decalogue 4 and Kieslowski state that fabrication of lies is required to attain a satisfactory amount of truth.