Georgi Dzhubrilov

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.

The picture features the life and deeds of Boris I - strong historic personality, which completes his mission to the full and at the end of his life receives holy orders. Prince Boris I is ruling in the late 9th century. In his youth, he, the brilliant statesman and diplomat, is experiencing heavy defeats in the wars he wages against his neighbors. Nonetheless, he manages not to cede any territories to the enemies. Under his rule, Bulgaria breaks with paganism and joins the Christian community, paying an exorbitant price, a heavy death toll, but there is no other way. The adoption of Christianity in 864 was a historical event of great significance. It guaranteed Boris I much need peace with the Eastern Roman Empire and allowed him to merge the numerous tribes inhabiting the country into a unified nationality and later to found a state. Boris I introduced the Slav script, thus turning Bulgaria into the cradle of Slav culture.

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.