In the fourth book of series Катерине will have to open gates in the curved Seashore straight on a lesson. She will run into rocky dragons, will find in the still human world of nestling of алконоста, and will meet with fairy-tale мышами-норушами. Together with her and Cyril will leave in fog Stepan - one of Катиных of class-mates, that very doubts, and whether it is necessary to remain him in the fairy-tale world. A tale-teller will save from death of the princely son converted by a stepmother in a dog, and his family. Will become acquainted with a bear that became such of own free will, and will know what the Baba-Yaga deceived by a sly czarevitch is capable on. One of the mightiest magicians will offer to her lordship over fairy-tale earth. Катерине will have to arrange the theft of tsar's fiancee that is not appreciated by her groom, and to rescue Brown Wolf being taken prisoner to the ancient enemy, I reign Кусману. And she will be led away from friends and will hardly deprive memory fairy-tale nursemaids. Adventures proceed!