That night, when trying to recover Tabby, Mildred is locked in a cupboard by someone who seems to be Miss Cackle but is actually Miss Cackle's identical twin Agatha Cackle, who sneaked into the school disguised as Miss Granite. Agatha is trying to turn all the teachers and pupils into snails. Mildred manages to turn herself into an ant, sneaks out of the cupboard and goes to Maud's room, where she tries unsuccessfully to wake her. Fortunately, she is able to attract Maud and Enid's attention by using ink-blots to write two notes – "HELP NOT ANT" attracting their attention to her and "FORGOT SPEL" clarifying her dilemma – and Maud and Enid turn her back into a human. Mildred tells them what is going on and, just as Agatha is about to turn Miss Cackle into a snail, Mildred turns her into a snail herself. They also bump into Miss Hardbroom, who had been away.