Carefree young nurse Marta learns upon her husband's death that he was involved in all manner of criminal activity, which puts her life in danger.

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.