The film’s plot is set during the war between Poland and the Soviet Russia (1919 – 1921). Wartime brutally encroaches on the life of a couple in love – Franek and Hanka. The Bolshevik troops cause damage to Polish villages and manor houses, and in one of the manor houses the invaders have a carousel. Luckily, the Polish cavalry comes to the relief just in time. Unable to wait passively, Hanka becomes a sister of mercy in one of the field hospitals near Vilnius, while Franek gains wide recognition after capturing a Russian spy.

A tragedy of a young "senior of the Vistula river rascals". Rysiek Cwaniak accidentally meets a Lady in a city tavern, who, delighted with Cwaniak's dance with her Black Staszka, kidnaps him into a dance whirl. The Lady's eyes strangely hypnotize the young Crafty and for a long time they do not let him forget about this alluring and mysterious Lady, but she, Baron Ilsky's mistress, does not even think about the accidental acquaintance and does not suppose that a momentary joke could shatter the current life of the bunch of people.