Félix, a somewhat clod-hopping young man, finds himself in the Grand Hotel of Little Lagonda, barefooted and in pyjamas. He is soon followed by a hooded, fat and leggy gangster. This is all the more strange as the hotel is under quarantine with the pretext of a plague-epidemic, in order to make it a suitable ground for the negotiations of certain oil-companies.
Private inspector Hável happens to travel on the train which is attacked at Biatorbágy. His attention is drawn to a suspicious man, and in the next few days he confirms that it was indeed him who committed the crime. Yet the police accuses not the lunatic Marschalkó but the communists. Summary justice is declared.
Based on the Hungarian writer Ferenc Herczeg's novel written in 1894, this film takes the viewers to the past of Hungary. Professor Sergius (Elemér Baló) insists that he invented a machine that can fly faster than the speed of earth's rotation and this enables him (or anyone who travels with him) to fly back with it to the past; that is to travel in time. To prove this the professor promises the hand of his daughter Rózsi (Katalin Karády) and all his possessions to the one who is willing to try the 'space travel' with him in his machine. The romantic and adventurous Hungarian count Ákos Tibor (László Szilassy) finally accepts the challenge. For the count's luck before the time travel he attends a costume ball dressed as a Hungarian hussar. Because when they arrive in the past, people think that he is a far relative of the wealthy landlord whose field they landed. This is how the strange adventures begins for our 20th century hero in the world of the 18th century Austro-Hungary.
Among the Gruber family, the rumor spreads like wildfire that their wealthy American relative, Menyhért Gruber, is visiting Hungary with his daughter, Mary. Various plans are devised to exploit the rich relative. The boldest of them all is the plan of Bálint Koltay, who directly pursues Mary's hand. However, the young ones fall in love with each other so deeply that Bálint stands by Mary even when the "wealthy" Gruber informs him that he's bankrupt. At this point, the only thing left to arrange is for Bálint, who poses as a landowner, to actually present a noble castle to his future father-in-law.