Honza (Michal Pavlata), a young car mechanic, wins second prize in a competition of amateur singers in the Prague Lucerna music hall. He accepts an offer by the director of the Liberec music theatre Alfa, and takes over at the very moment when his predecessor leaves after a quarrel with the director. Honza cannot read a musical score, which is immediately clear to the head of the theatre music group, Cankar (Angelo Michajlov)--but Cankar is relieved to find out that the new singer is well able to sing by ear. Honza thinks that he can do anything, that he has nothing more to learn, and that he can achieve everything that he sets his mind upon. Until he fails completely at a recording session in radio.