1914-1939. On the eve of World War I, twins are born to the Winny family: Ania and Mania, Stanisław's daughters. Their mother dies in childbirth. In the difficult times of the war and the interwar period, Stanisław raises them with the help of his mother Bronisława. Both sisters fall in love with the same boy, Paweł.

Helina, a modest checkout assistant at the Butterfly retail chain, dreams about getting a better life for herself and her daughter. An opportunity presents itself when Helina becomes a store manager. However, she soon discovers that the price for better wages and an improved standard of living is dishonesty, employee exploitation, and fraud.