At 40, Zosia has a happy second marriage, a well-adjusted daughter, a good career, and a comfortable home in Warsaw. But as she and her family usher in the year 2000, she wishes some things in her youth had happened differently, and she's magically transported back to 1987, when she was still married to her womanizing first husband, Darek and lived in the People's Republic of Poland.

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.