A musical comedy about two indistinguishably similar siblings who love music, but each of them is completely different. Pavel Fořt is a professor of classical music at a pedagogical institute, his brother is a jazz musician and plays music in America. When the twin brother suddenly appears in Prague, they switch roles.
A young widow with two children, a member of the spa orchestra, with the help of the devoted friends and the understanding of her children, she manages, quite well, with her demanding "double". The problems arise when he succeeds in a prestigious audition for the Prague Philharmonic Orchestra and then he will go on a long foreign tour.
A young veterinarian, Jiří Klimeš, returns to his native village after graduation.
