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.

Warsaw after the fall of the Warsaw Uprising. The Germans expel the civilian population and then proceed to systematically destroy the city. The capital is transformed into a sea of rubble, among which a few survivors hide – modern-day Robinsons. One of them is Piotr Rafalski, who rescues Krystyna, a wounded Jewish woman. Three soldiers of the People's Army, cooperating with a Soviet telegraph operator, are also in the city.