A fictional story of Wolfgang Amadeus Mozart's stay in Prague. The film, in no case, claims any historical facts. It only tries to evoke the spirit of that time by connecting Mozart's music with the architecture of Prague and by pointing up the changes in Prague during Mozart's two-hundred absence in the Czech metropolis.

In the dead of night, a few hours after Mozart's death, the usual suspects are summoned to Mozart's room by Count Pergen, head of the secret police, who considered Mozart a potential revolutionary. Over the corpse, he interrogates them, trying to discover the true cause and significance of Mozart's demise.

Postwoman Mrs Skorepa, her husband the ambulance driver Mr Skorepa and their eleven-year-old twins Petr and Pavel live in Prague in Malá Strana (Lesser Town), one of the Prague's historical and oldest quarters. The boys are crazy about cars and everything linked to them. They don't share their father's love of classical music. On the other hand, they are crazy about the newly announced scrap yard competition for paper collection. The lottery tickets awarded for every ten kilograms of old paper collected could win them a go-kart.