While playing Indians two Czechoslovak pioneers are captured by the criminal who wants to cross the border illegally.

Small Yozko, who lives with his mother, dreams of a real father, whose ideal is embodied in a tractor motorcyclist on Formula nickname. However, his mother perceives cheerful cool formula, finding it, like many villagers, frivolous. Friendship Formula fills the boy his father's absence, and Yozko increasingly tied to his friend. Suddenly received a telegram from the actual Yozko father, his mother will have to take a difficult decision, but life itself makes adjustments ...