The fairy tale is based on two fairy tales by Božena Němcová, "Righteous Bohumil" and "The Black Princess". It tells the story of a weak king and his wife, whose desire for a child leads her to a conspiracy with the devil. The princess, who grows up under the influence of the "impure" powers, only escapes from their power thanks to her love for the fisherman Radek.

Hockey requires great commitment and even sacrifice from an early age. The thirteen-year-old players of a school hockey team, led by an experienced and perceptive coach, struggle with various problems of their age, from first loves to low self-confidence and disciplinary problems, but in the end they are all consumed by a sense of responsibility. The film touches on the dark side of the demanding sport, but it often acts childishly and simplifies the complex motivations of teenage boys.