 Mildred arrives for her second year at Cackle s in a positive mood. There s a new intake of young would-be witches one of whom, Sybil, seems particularly wimpy. Mildred, in an attempt to be kind to Sybil, only seems to make matters worse and is inevitably blamed for Sybil s tears. Meanwhile, an argument is going on in the staff room between Miss Bat and Miss Drill about who is to be the second year class mistress. The usual second year tutor has decided not to return. Miss Cackle suggests that they share responsibility while she makes up her mind. This leads to rivalry and mischief between the two factions of Class Two - those for Miss Bat and those for Miss Drill. Ethel and Drusilla enlist the help of Sybil and Clarice in their scheme to get Mildred and her gang in trouble. When Mildred makes a surprise discovery - that Sybil is Ethel s younger sister - the game is up. Neither Miss Bat nor Miss Drill make the grade as Year Two Class Tutor and - horror of horrors - Miss Hardbroom takes over once again.