The opera lady singer Ema Destinnová is in all her splendor at the American stages. But in Europe there rages war and she decides to return home to Bohemia.
When Jonáš, a water sprite, and Karolínka, the miller's daughter, fall in love, they don't have it easy. Jonáš's father, the grumpy water sprite Hastrbuch, stands in the way of his love, while Karolínka has no idea that her beloved Jonáš is not human. Luckily, there is a young man named...