Stepan goes fishing with his family. In the haze of the morning fog, he sees a beautiful girl. He follows her and ends up in the world of Fairy. Stepan himself considers himself a victim of the seductive Sineoka, because a year later he receives a gift from her - a baby in a basket. And eight years later he discovers that in addition to his son, there is also a daughter growing up in the fairy world! The surprises don't end there. His wife Lilya turns out to be Sineoka's messenger. But the most important test awaits everyone ahead. One fine day, Stepan realizes that the world of fairies is in danger... On the site of Lisiy Bor, the refuge of the beregins (as they call themselves), the authorities are going to build a chemical plant...