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.

1956 film by Jiří Sequens

1974 film directed by Vladimír Čech

1960 film by Miroslav Cikán

It's very human and nice story about lofty princess (her father is amiable but incapable - unforgettable performance of S. Neumann) and good, nice, kind and well-principled young king (prince) who tries to make tender her calm heart to get married with her. After being refused (she's very capricious), he conclude to make her better. He start to work as a gardener at her castle (in secret) and successively bring she to her senses...The story continues when already reformed princess and the young king (she learn about his real identity later) have to take refuge from troops, that princess father (old king) has sent (of course he took a bad and mean counsellors advice). They have to take shelter by several ordinary and poor families, which are always very friendly and give them a help... Of course the tale has happy end.