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.

The sad hero of the story, Petr, an ordinary lawyer in a construction company, is crowded into a small apartment in Žižkov with his wife and grandparents, desperately struggling with the lack of money. One day he offers an old man a seat on a crowded trolley bus and is generously rewarded for his good deed, for the unknown old man is a fabulous grandfather. He gives Peter a magic bell and the opportunity to make three wishes, but the first two slip through his fingers. For the third, the astonished man must take time to think...

The mother is trying to prevent the break-up of a marriage of many years. She knows about her husband's infidelity, but fears his leaving the family with the teenage children. But the crisis seems inevitable...