A black child rescued from by Russian sailors, whom they name Maksimka, having overcome his fear of white people, turns out to be an unusually smart and kind little boy. The rude drunken sailor Ivan Luchkin was especially attached to the boy. Once it was Maksimka who managed to save Luchkin from foreign recruiters of labor. For resourcefulness and courage, the young hero is enlisted in the team of the corvette and becomes the cabin boy of the Russian fleet.

Katya and Grisha lived in a big city. Grisha was older than Katya, but he respected her and did not hide his secrets from her. And I did not notice at all how the girl was growing up and how completely different feelings were born to her.

The Vityaz sailing corvette, whose team has to endure severe trials, goes on a flight. Relations between the sailors and the stupid and soulless baron von Berg replacing the senior officer did not develop. By his behavior, he causes the hatred of the whole crew, which develops into a riot when he gives the order to drown the darling of the whole team - a little puppy. All this, as well as a storm in the Pacific Ocean and other dangerous adventures, rally people even more and make them even stronger and more courageous.

Soviet agent Fedotov is air-dropped into Nazi occupied land. He changes over into Mr. Ekhert, a German entrepreneur wishing to take advantage of eastern worker slave labor in occupied Ukraine. Ekhert (Fedotov) enters into a partnership with a German entrepreneur who's son, Willie, is a high ranking Nazi. Together they go to Vinnitsa, Ukraine and start a factory. Fedotov begins seeking contacts with headquarters, but faces problems when a Ukrainian Nazi collaborator manages to infiltrate the Soviet partisans.