Professor Dimov is a diplomat who has been recruited as a spy by a foreign intelligence service. The suspicions fall on Dr. Belcheva. Major Kalinov is entrusted with the investigation of the case. He learns that she is Dimov's mistress. Paris, France. Dimov and Belcheva go out leaving a bag with secret documents in Belcheva's hotel room. Kalinov manages to retrieve the documents. After this incident Belcheva dies in hospital from poisoning. On board the plane Kalinov exposes the professor as a spy. Bulgarian counterintelligence officers arrest him.

Part one of this two-part epic follows the life and deeds of Boris I – a strong historic personality, which completes his mission to the full and at the end of his life receives holy orders.

Knyaz Boris I reached the most important spiritual insight - the country needed a single language and script. It accepts students of Cyril and Methodius, creating Ohrid and Preslav Literary School. What other nations took centuries, for bulgarians takes place only about 20 years after their baptizing - introduced a Slavonic Alphabet.