A young engineer, Štěpán Pavlík, dreams of becoming a cosmonaut.

The story of a music academy student Zdenek, who meets a charming girl, and without realizing also gets a son with her. Dealing with such a situation is not easy, especially when one day the child's mother disappears. Twenty year old Zdenek faces a serious decision. Although he is aware that a child may endanger his studies and perhaps even future career, he refuses to entrust him to the care of the state institution.

The husband and wife Ludva and Hedus Homolkas with their twins Péta and Máta and Ludva's parents - the granny and grandpa - arrive in the snowy Spindleruv Mlýn for a holiday. They promise to each other that they will not spoil the quite expensive holiday by quarrels. If somebody hurts the other one he/she will kneel as a punishment.