The title "Children and Fish" comes from a Polish medieval proverb: children and fish should be silent. We have a background of a man in his forties abandoning his wife for a young and capricious girl, his wife consoling herself quickly with one man after another, a film director who makes advertising spots but dreams about a serious film which will put his audience on their knees, and a number of other largely (though not always) funny characters. Against this background there is a sweet man Antoni who was in love with Anna while a high school senior, never married, and is now a math high school teacher. Anna became highly successful in the advertising business, raises alone her now 16-year old daughter Marysia, and considers herself self-sufficient. There is a reunion 20 years after graduation of that high school class. Antoni and Anna meet again after all these years ...