It's WWII. A Soviet aircraft crashes on Nazi-occupied territory. Pilot Grivtsov and his radio operator Katya survive, as well as flight navigator Linko, who gets ejected from the plane. Each must find their way, performing daunting military tasks and fighting to survive. Complications arise when an act of sabotage committed pre-flight shows that Grivtsov is a traitor instead of a hero. He now faces execution.