The series consists of 26 episodes divided into two parts as 13 episodes - the first covering the period between 1923 and September 9, 1944, and the second one - after it. The main characters are Nikola Dejanov, played by Stefan Danailov and Dimitar Bombov, nicknamed "Mitko Bombata" (Mitko the Bomb), played by Grigor Vachkov. They are childhood friends, both communists, spies, and partisans.