Moscow of the 1950s, June. Urban residents, having loaded all their scrub from mattresses to pots into suburban trains, leave for dachas and villages. Among them is the family of the boy Denis Korablev. Denis's parents don't really want to continue the tradition of renting a house for three summer months in the village, but Denis's grandmother is convinced that fresh country air is extremely useful to all of them. Life in the village is in full swing. Denis's dad rides a bike, Denis's mom walks around the village in a white sundress, Denis's grandmother makes jam from strawberries, which have been born a lot this year. Denis has fun in the village — he joins a local gang of boys, befriends a girl Lena, goes to the boat station and plays a lot of mischief. One day the most terrible thing happens to Denis for every boy — he falls in love.