The young worker Helena Pokorná and her widowed father are employed in the same factory. The father is spending his holidays at home in Prague and is looking forward to work. Helena is to go to the seaside for a rewarding holiday. On a hot July day, the girl rides to work in a crowded tram. On the embankment, the crowd pushes her out and Helena fails to get into several other cars. Tempted by the river, the girl calls in sick to work. She takes a steamer to Modřany. There she meets a young man who wants to sleep by the river after his night shift. Helena is drawn into the strange pastimes by a group of notorious loafers and water girls.

Two kind but foolish sisters live together in their villa in a small town in South Bohemia. Fany (Natasa Gollová) has never married and Andelka (Eva Svobodová) is a widow. In the morning, the two sisters go into town. They need to buy fuel oil, put money in the bank and give plums to the teller. In the meantime an smallish orange Skoda MB car parks at their house, with Hermínka (Iva Janzurová), the old ladies' niece, and her fiancé Michal (Jirí Hrzán) in it. Michal has forgotten to bring flowers and has to go into town to fetch them. At the bank, Fany wants to deposit money but the minute the teller opens the safe, a thief arrives. He knocks the teller and Fany unconscious and runs away with the money. When Fany comes to her senses again, she sees Michal and accuses him of being the thief.