A meeting of former classmates becomes life-changing for Irina and Sergei – their former feelings have not cooled down, and quite soon the forty-year-old sweethearts understand that their separation 25 years ago was a mistake.
Sergei is a widower; Irina has been divorced for long. It looks like nothing should prevent them from being happy, but they both have adult daughters. Alina and Zhenia are almost age-mates, but the girls’ characters and live values are completely different. Zhenia is purposeful, serious, determined.
Alina is easy-minded, featherbrained, spoiled. Due to the conflict of characters of the stepsisters the parents’ happiness is compromised. Understanding that they can lose each other again, Irina and Sergei do their best to get the daughter together.
However, the conflict between the girls escalates into the open enmity. The tension reaches its peak. Irina and Sergei separate. Will the stepsisters be able to understand their fault and get a grip on themselves, overcome their egoism for the sake of the parents’ happiness?
Or will Irina and Sergei’s life stories become another confirmation of the sad saying: you can’t step into the same river twice?