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.

The Homolka family celebrates a great occasion: they were finally able to buy a car. They immediately begin to drive for small trips to Hradcany, to the airport, and plan further trips. Their euphoria is spoiled by a letter from their great-grandmother. Their great-grandfather is dying and the family is expected to come along to say goodbye. The annoyed Homolkas therefore set off to the South Bohemian village where the grandparents live.

Behold Homolka is a comedy set in Prague, Czechoslovakia. It follows the story of a family and their quarrels, with a focus on social satire. The plot revolves around a locked-in-a-room situation, showcasing the pettiness, stubbornness, and scolding within the family. The film takes place over the span of one day and explores various relationships, including mother-son, father-in-law-daughter-in-law, mother-in-law-daughter-in-law, and father-son.