The film takes place the Budapest Amusement Park in 1919, just before and during the proletarian dictatorship. After the outbreak of the proletarian dictatorship, both the former employee who returns from Russian captivity as a communist and the domestic philosopher spreading Marxists ideology regard the nationalisation of the Fun Fair vitally urgent. In this, the daughter of the owner of Orpheum Blau, Ilona, assisting most enthusiastically.