An architect Joanna tells her friend Halina on the telephone about her love troubles and suddenly hears a nice man's voice: "The best cure for love is another love." Then she becomes a forgers dispatcher mistaken for Honorata by telephone and decides to work out a forgers secret and the secret of her new love Andrzej.

In Nazi-occupied Warsaw, teenage scouts Alek, Rudy, and Zośka risk their lives pulling down a swastika and hoisting the Polish flag atop the German “Zachęta” cultural center and then blowing up a mobile propaganda cinema.

Stefan Starzyński, the mayor of Warsaw, organizes life in the capital in September 1939 and lift the inhabitants' spirits via radio announcements. After the surrender, he does not use his last chance to escape.