On their first day, Mildred's phone is confiscated by Miss Hardbroom. The first years are assigned their houses and Maud is made head of the first year. The first years receive their cats and have their first flying lesson. Mildred's cat, Tabby, is scared of flying and Tabby causes her, Maud and Ethel to crash into trees. Miss Hardbroom decides to arrange a flying test for the class and Ethel tells Esmerelda she will help Mildred. When Mildred tries to train Tabby, Ethel offers to help and pours a bit of sardine juice on the broom tail. Ethel and Mildred pass their test, whilst Maud struggles with Midnight, however, Miss Hardbroom reveals Mildred and Maud's cats have been switched and Mildred is told she will be expelled. Mildred and Maud try to find evidence that Ethel was responsible and they find the sardine tin and try it and they switch bodies. Maud is sent to Mildred's room by Miss Hardbroom unbeknownst to her. The following day, Miss Cackle finds Tabby with a notebook belonging to Ethel. Ethel admits to switching the cats, but that it was to help Mildred, and Esmerelda backs her up. Ethel is forgiven and Mildred is kept on at the school, still on a trial basis.