Impersonating a knight is one of the favorite games of nine-year-old protagonist. Now as Don Quixote, now as D'Artagnan he is fighting evil, he is searching for justice and defending the weak. Together with his friends, packed in cardboard armor, they play all day long. As he is playing, however, he unwittingly witnesses the relation between his parents and gradually comes to understand that the world of the adults is far removed from the canons of knightly honor. His parents love him, but never seem to find the time to listen to his concerns. The deceit, corruption and lack of respect in his own family alienate the small boy. The only adult, whom the boy trusts, is his uncle to whom he is attached by a genuine, equal, man-to-man friendship. He takes him to the cinema and theater performances and talks to him like with his peer. Will this sensitive kid ever succeed in building an internal armor against selfishness and rudeness?
The university student Bobchev joins a youth brigade. The commander's council entrust Bobchev with a literacy course for members of the brigade. Velizarov and Monkata arrive in the camp to carry out sabotage. They place explosives on the dam, and attempt to win Bobchev over by means of intrigue. There is a storm: the camp is put on the alert. Everyone joins the rescue work at the dam. After a long struggle with Velizarov, Bobchev cuts the burning fuse of the explosive. The dam does not yield to the pressure of the flood. Everymen sing in Jubilation.
