At the end of 13th and the beginning of the 14th century twenty-four-years old, Prince Svetoslav Terter takes the helm of the state. The young Prince engages in a intricate political game, into getting his way by means of court intrigues, and is forced by circumstances. Svetoslav Terter is remarkably shrewd and consistent. He is perhaps the only head of state at this time to take the liberty of impeaching the primate of the country's church. He tries to rally the neighboring Slav people to a joint resistance to the Turkish conquest. Terter lives through a great personal tragedy. He becomes estranged from his dearest person, Mariya, who is too weak to join him on the difficult road of his choice. (written by Georgi Djulgerov)

Bolshevik Foma Korshunov returns to his village. Soon his son, seven-year old Mishka gets a new nickname - "little communist". When bandits come to the village Mishka, knowing that the reds are close, saddles his horse and hurry to warn them about the danger.

A third part of story about a Soviet spies trying to infiltrate German Intelligence center "Saturn" during and after the WWII.

Soviet Scientist Petrovich pioneers the way to the Sun, but his spacecraft is never heard from again. Later, Andrew's laboratory investigates means of protection from deadly radiation. Andrew repeats Petrovich's journey, and offers his life to rescue an orbiting science laboratory, which holds the solution to the problem.

A certain number of French fighter pilots who will not accept the Second Armistice at Compiègne nor Vichy's orders decide to join the USSR. Once they have reached Moscow they resume training and form a squadron they call "Normandie". Reinforced in 1944, the squadron wins many victories. Following the acts of valor displayed by its pilots during the Battle of the Nieman River, it becomes the "Normandie-Niemen" squadron for the rest of times...