Three young employees of Spofana Company, Zdeněk Soukup, his girlfriend Věra Novotná and their friend Věra Matoušková were rewarded for excellent work by a vacation in the mountain resort of Tatranská Lomnica. The Prague Transport Company controller Gustav Anděl also travels to the same destination as a reward. He does not know yet Věra, future wife of his son Mirek, and has decided to secretly check her behaviour in the absence of her fiancée. By mistake he considers Věra Novotná to be his son's girlfriend, and so his investigations cause him plenty of embarrassments. Nevertheless he enjoys his stay in the mountains, because he has met there Bohouš Vyhlídka, whom he has befriended during summer vacation two years ago. Meanwhile in Prague Mrs Andělová helps Věra's mother to exchange flats, so that their children would have a place of their own. During a trip to the Lomnický štít three holidaymakers are stuck in fog in a mountain cabin. So far Gustav Anděl was desperate because of the behaviour of his future daughter-in-law, who embraced Zdeněk all the time, and only there he finally notices he has mistaken her for Věra Matoušková. Now he is content, because this Věra is a perfect match for his son.
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TV Nova