Mr. and Mrs. Smíd, parents of the fair-haired Slávinka, are at the peak of their happiness: Slávinka is over her vows and will be marrying her criminal attorney, Anatol Brynda, judge. Anatol may be a beginner and an all-round deer - but what parents wouldn't do for the happiness of an only child. They arranged for the future spouses to have a modern apartment in every way. And the apartment's biggest attraction, of which Papa Smíd is particularly proud, are the modern double beds, one of which, at the flick of a switch, automatically slides out of the bedroom into the study or vice versa. What Papa Smíd doesn't know, however, is that because of this ingenious device, everything turns out completely, completely differently than he imagined.