Three pilots are best friends and good fighters. During the WWII they are taking an oath to refrain from love until the end of the War. But soon they meet three women-pilots. One by one they give up the oath, and all three fall in love.
The Soviet steamer Bogatyr delivers construction materials and rafts with timber to the earthquake-stricken city of Marto. However, foreign intelligence is preparing a sabotage operation on the Bogatyr...
The nine-year-old Prague boy Pepiček flies to Moscow as an involuntary stowaway on an airplane. Together with the Soviet pioneer Mischa, he pursues an alleged agent in the hustle and bustle of the World Festival and is flown back to Prague in the evening.
