Five young people take off in a lighter-than-air machine at the Prague Centennial Exhibition. A live-action/animated film based loosely on Jules Verne's novels Two Years' Vacation and The Mysterious Island. The film in Art Nouveau style consists of live-action scenes, generally shot in black and white, as well as hand-drawn, stop-motion, and cutout animation. Various live-action and animated elements are often composited into the same scene.

The exemplary accountant Antonín Safránek lives his orderly life as a citizen of a small town. His wife Eliska brings up their three children and desperately tries to get by on her husband's low salary every month. At the same time, she sadly watches the luxurious life of their neighbor and other people like him who have no qualms about improving their standard of living by cheating. One day, the infallible Safránek makes a mistake in the cash clearance and there are nine one-hundred Crown bills left in the safe. An unexpected company control carried out the next day passes without problems and the account is closed. The temptation is too strong. The insufficient control enables Safránek to gradually steal one million Crowns.