The heroes are husband and wife Oldřich and Věra Laviček, who with their children Petřík and Zuzanka leave for Loukov to the cottage of their acquaintance, engineer Radim Zvon. They also want to buy a cottage and hope that Zvon will help them. In the end, they look at the picturesque cottage of grandfather Komárek, who agrees to sell it and rent one room to the Lavičkas for the time being. The Lavičeks decide to spend their vacation at the cottage.