A biographical film about the famous Czech painter Mikoláš Aleš, portrayed as part of the vanguard of the working class and a spokesman for the oppressed, who asserts himself despite the opposing bourgeoisie and reactionaries of all kinds. The film focuses on the period when Mikoláš Aleš participated in the competition to decorate the National Theatre.

Mr. Novák, an insurance company clerk, only cares about his job, nothing else interests him. Even the social changes in February 1948 leave him indifferent. He only becomes aware of them when the insurance company is closed down. He has to make a decision: either retire or go to work in a factory. Neither of these options appeals to Mr. Novák...

Leopold Kohák married a rich widow a long time ago and now has nothing to do compared to his energetic wife. He's growing old and troubled by the fact that he betrayed his first love Emča and his beloved river Sázava where he spent his childhood and youth. A visit from an old friend Lebeda brings it all back to him. After a nervous breakdown Leopold secretly visits his home instead of going to the spa. A wandering tramp suggest Leopold should bathe in the magical waters of the Sázava, and slowly his youth returns to him.