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1197. King Kaloyan ascends the throne in hard times for Bulgaria. The country is still recovering from a century of Byzantine subjugation. He is forced to carry out a very flexible foreign policy in order to strength his positions. Pope Innocent III recognizes him as Emperor (Tsar), but a little later the fourth Crusade crosses the country under Emperor Baldwin. A new conflict is coming. Tsar Kaloyan wages the decisive battle at Adrianople and wins.
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Ani, a charming young girl, is a driver at Sofia Airport. She sends a letter to her boyfriend Boyan, a worker at a large construction site. The letter contains a single word "yes". Boyan starts preparing for a wedding. The Soviet pilot Andrey will soon return home after several years spent working with his Bulgarian colleagues. They arrange a farewell tour of Bulgaria for him on which Ani has to drive him. Because of mistaken jealousy, Boyan tears up his sweetheart's letter.
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Captain Velkov was sent chief of a border post near the village of Novi Izvor, where he was a partisan. In Novi Izvor a celebration is being prepared to mark the switching on of the electricity. Saboteurs cut the cables, killed the watchman and set fire to the machinery on the farm.
