It's the first day of term and Mildred is feeling positive... until she has a hand in a wing of the school falling down! Enthusiastic new first years arrive and nervous Sybil Hallow is terrified. Mildred stumbles upon something very important.

Ethel gets more than she bargained for when her clone spell spirals out of control. Mildred goes in search of the Founding Stone. Miss Hardbroom grows increasingly suspicious of Miss Mould.