The films 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