 Sybil, Clarice and the other first years are left with Miss Bat and Miss Drill while the rest of the school is away on a trip. The two teachers see this as an opportunity to put all their favourite educational ideas into practice. As a result, there s a lot of P.E. and chanting for the girls. In the staff room, Miss Drill and Miss Bat are competing for Miss Cackle s vacant chair and the authority it confirms. The first years however, are FED UP with P.E. and chanting, so Miss Bat and Miss Drill persuade Mrs. Semolina to teach a cooking lesson. This ends in disaster when Sybil and Clarice use the opportunity to lace the salad dressing with a dancing potion. Soon, the staff is helplessly and wildly tangoing the staff room to destruction! Sybil and Clarice pretend to make amends for this catastrophe by inventing a magical everlasting light to replace the candles (which are always in short supply). They invent a magic lamp in an attempt to make all of Sybil s wishes come true. The side-effects are disastrous, and the castle is nearly destroyed...until Clarice has an inspiration.