Finally, there is a new teacher in Mildred Hubble's class - instead of the terrifying Miss Hardbroom. And Mildred has problems again: her hair is hopelessly ruined, her beloved cat has a nervous breakdown, and all this is not without the participation of the omnipresent Ethel Hollow. But Mildred, of course, will cope with the situation. And she will again be lucky to be in the right place at the right time.