The pilots Boris and Stoyan are in love with Zora. She prefers Boris. They go to the nightclub. There Boris falls for the singer who is an agent of a foreign intelligence service. The two of them dance together. A general mobilization is announced on the radio. The singer is arrested. Boris and Stoyan go to a special mission. Their aircraft bomb enemy targets. Zora becomes a nurse. She worries about Boris's fate. The two pilots have been taken prisoners. Foreign general interrogates them. He cannot get any information out of them. A cunning trick of Stoyan gives Boris a chance to escape. Boris comes to Zora in the military hospital. Stoyan appears too. He also manages to escape from a prisoner-of-war camp. Stoyan receives an order to keep the spy's villa under surveillance. There he finds Rita, who is hiding her wounded brother in a secret room. Stoyan visits her; they stroll together, and fall in love. Colonel entrusts Boris with a dangerous mission. There is aerial combat. Two ...