A new design aircraft flies higher, farther and faster than all others. Enemy intelligence agents are trying to infiltrate the cottage of the inventor Professor Bogolyubov and steal the drawings of the aircraft.

The film tells about the heroic struggle of Ukrainian farmers-partisans with nazi invaders during the Great Patriotic war.

The story of three young Russsian adventurers against the background of post-revolutionary skirmishes in the Ukraine. The boys get mixed up with a wounded commissar and a marauding White Russian officer. They find themselves in all sorts of predicaments before the Reds arrive to save the day, and become the mascots of a troop of Bolshevik cavalry.