At the end of 13th and the beginning of the 14th century twenty-four-years old, Prince Svetoslav Terter takes the helm of the state. The young Prince engages in a intricate political game, into getting his way by means of court intrigues, and is forced by circumstances. Svetoslav Terter is remarkably shrewd and consistent. He is perhaps the only head of state at this time to take the liberty of impeaching the primate of the country's church. He tries to rally the neighboring Slav people to a joint resistance to the Turkish conquest. Terter lives through a great personal tragedy. He becomes estranged from his dearest person, Mariya, who is too weak to join him on the difficult road of his choice. (written by Georgi Djulgerov)

A geologist engineer Yuliya disappears. Ablamov, an elderly engineer, organizes a rescue party to look after her in the mine galleries but they find nothing. Yuliya was last seen at a ceremony for award-wining miners. The newsreel crew was filming the event. Yuliya left in the middle of ceremony. Prodanov, a headstrong and quarrelsome engineer, had followed her. Suspicion falls on him. However, the film sequences shot at the ceremony reveal that Ablamov reacted suspiciously to Yuliya's exit. Detected as the murderer, Ablamov attempts to cross the border but is caught. Yuliya had discovered that the ore contained uranium. Ablamov had replaced the samples in order to prevent the development of the uranium ore deposit.

A research worker Robespier Galabov (Yakovlev) lives with his family in a small communal flat with shared kitchen and dreams about a self-contained home. Galabov meet Rangel Lelin (Gospodinov), the well-known amidst the localities as the past-master, when he realized that the new municipal apartment they apply for won't be ready in the next decade. The Past-Master promises to build the private house in a month. After starting the construction, Rangel Lelin constantly blackmail Galabov for more money through treat of "putting the hat". Finally the house was built but the inauguration become gloomy. It turns out that the chimney of the fireplace doesn't work properly. After days of luckless attempts to solve the problem the past-master's brother come into sight. Knowing the Lelin's tricks he find a hat built in the chimney.