The fairy tale takes place in a summer camp. The main characters, pioneers Petka Vorobyov and Tanya Zabotkina, are trying to unravel the mystery of their counselor, nicknamed Beard, who is behaving very suspiciously. In the mornings he is unusually kind, and in the evenings he becomes terribly angry for no reason. Friends manage to find out the reason for this oddity. As a little boy, he angered the Fairy of Politeness and Accuracy, and she cast a spell on him. To help their counselor, the guys decided to go to the fairy.