A young man calling himself "Baby" (Martin Dejdar) arrives at the home of Prokop (Josef Abrhám) and his family, ostensibly to care for their mutual elderly relative.
Baby wears eccentric clothes, plays guitar, and has a passion for rock 'n' roll, and quickly starts to disrupt the lives of those in the local community.
His son Kšanda (Jan Semotán) hangs around with a local gang, and his daughter Bejbina (Sylva Tománková) is courting Eda (Jakub Špalek), a waiter at the hotel.
Eda, meanwhile, becomes suspicious of how much time Bejbina is spending with Baby and begins to flirt with Milada (Jitka Asterová), a singer at the hotel.
The film descends into a series of more abstract musical numbers, during which Eda, having lost Bejbina but realising the error of his ways, ruins a communist party event at the hotel by bursting into song.