A remake of Vávra's 1948 atomic age thriller Krakatit.

Returning home to Prague, the magician Pasparte, an owner of a circus caravan, meets his dying colleague who entrusts his beautiful daughter Aloisie to his care. In Prague they all take up their lodgings at the house At Blue Fish in which they intend to arrange the programs. The firm is owned by widow Evzenie with whom Pasparte shares flat and bed. Evzenie is jealous of Aloisie therefore Pasparte sends Aloisie as a housewife to the single man Jakub Kolenatý who earns his living by photographing and wants to record the revived pictures of Prague. Pasparte wants to found in Prague the first permanent Czech movie theatre in which there would be projected also the original Czech films.

Soviet engineer Kuznecov is coming to Prague as an expert on work with the tunneling shield in construction of the metro. He is returning after more than thirty years. In May 1945 as a young soldier in the Red Army he was seriously injured in the liberation of Prague and while recovering experienced a great love with a young teacher called Vera.

A trespassing gang of boys encounter a ghost in the ruins of a castle. When they rescue the ghost who is caught in a trapset, they become allies in a fight to prevent ruins from being turned into mushroom farm by the city authorities.