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.

On 25 April 1605, the knight Milota was killed by the royal armourers while escaping from the castle of Temice. However, the robbed treasures were not found in his possession. Almost 400 years later, Jindra, Tomas and eighteen-year-old Alena spend their holidays at the castle with their grandfather, the castellan. The castle needs repairs, but there is no money for them. Tomas and Jindra decide to find Milot's treasure, which could help the castle. The visitors are guided by Alena and two temporary workers, Roman and Petr. Among the tourists, Professor Horák, who shows a suspicious interest in the castle's collections, attracts the boys' attention...