One fine day, Katerina found a letter in her husband's jacket. She knew that reading other people's letters was not good. But her husband is not a stranger to her, is he? In this case, you can read it. And from the first lines of the letter, she realized that her husband Max, a philosophy teacher, had a young mistress. Family friend Victor suddenly appeared in the house and decided to console Katerina. It was he who accidentally blabbed about some of the juicy secrets of his friend the professor. Pulling these strings, the wife learned something that she could not even imagine.

Katya and Gleb are happy in marriage, their charming little son Yegor is growing up. Nothing threatens their love until a young woman recovers with her baby and friend at sea. Gleb, busy with urgent work, forced to stay home.