Michał and Ewa lead a stable life, while their neighbours Kasia and Bartek struggle with financial problems. When Kasia unexpectedly confesses that she has something in common with Michał, the friendship between the two couples is put to the test.

Polish pilots overcome prejudice to fight against the Luftwaffe with the Royal Air Force during the Second World War, in the hope of protecting both Great Britain and their own Poland from the German advance.