Frantisek, the main character is returning to his family. Until now he's been, "successfully" avoiding all relationships. He is an ingenuous and a pure person and thus, is regarded as an idiot. He becomes involved in various love and family conflicts. It is because he hasn't experienced much of the "real" life that he is able to perceive human relationships in their genuineness.

A period musical comedy set in a quiet Prague quarter at the end of the fifties. Using the western plot device of the "man from nowhere" a generation gap story unfolds of changing social climate. The action is driven by the character of a young man named Baby who causes a local rebellion by bringing rock'n'roll to a Communist neighborhood raised on swing.