This 12-episode TV movie tells about the fight against fascism of Major Nikola Deyanov, known in the intelligence service by the code name Sergei. Witnessing the murder of his father, little Nikola seals the memory. He took a training course in Moscow and returned to Bulgaria to pursue the enemies of the people. The two main characters who embody opposites and are in constant confrontation are Major Deyanov and Bogdan Velinsky. Deyanov was a united model of Bulgarian Communist Party's figures during the years of communist resistance. He is a committed communist whose father was killed in the September 1923 uprising. He later became a Soviet intelligence agent. He is emotional, he exudes a boyish Charm, sometimes manifests himself as a playboy. Velinsky has a prototype for the chief of police from the Kingdom of Bulgaria, Nikolai Geshev. He was a young and breakthrough police officer, later elevated to the head of the secret service of the kingdom, and after September 9, 1944, became an agent of American intelligence. Velinski is calculating, with a cool and witty mind. He refrains from being too cruel to the Communists.
—Georgi Djulgerov