The story of a practical education environment without superficiality, clichés and affectations. The film is based on a real basis and shows what happens when the system fails. Set in the harsh environment of elementary school. The group of local students - young thugs are accused of rape and murder of a young trainee. Still have not been sentenced yet and still attend school. Until it starts young teacher, who had his unorthodox approach gains the sympathy of other cantors and students. For what purpose, however, really came to school, find out until the end of the story.

The second part begins shortly after the death of Michal Dostál, the biggest bastard of them all. Michal's father and grandfather are convinced that teacher Majer was behind the murders of all three students and was avenging his sister's death. They begin to psychologically torment Majer and search for evidence. The new police investigator Karas, who takes over the case from the deceased police investigator Paleček, is also looking for evidence. Karas immediately suspects something is amiss in the deaths of the "bastards" and also begins to focus on Majer, who is now the school principal.

Teacher Tomáš Majer, who joined a former special school in 2010, has disappeared. He arrived at the school several months after his sister Jana, also a teacher, was murdered. During the school year, the boys who murdered Jana Majerová mysteriously died. Tomáš Majer most likely avenged his sister in cold blood.

Teacher Majer is released from prison under an amnesty. His elementary school classmate Ivan, who lives in a Roma ghetto, takes him into his home. Majer has no family. He has no one left, so he welcomes Ivan's offer. Ivan tells Majer that he has decided to help him mainly because he needs to reopen the school where Majer used to teach and briefly served as principal. Living in the ghetto, Ivan is familiar with the problems of his community and knows that the closure of their beloved school has not been good for them. Majer begins to reach out to his former colleagues and, above all, his students to ask for their help. Many of his students also have children of their own. He experiences a number of comical situations with them. However, he has no idea that he is still being watched by Dostál, the eldest member of the mafia family, who knows that Majer has been released and decides to avenge his son and grandson.