When a new student comes to Broomsfield Academy, Mrs. Kettledrum informs the students she is an extra-talented witch-in-training. At first Heidi is intrigued and wants to be friends, but when Jodi tells Heidi she intends to be the best witch ever, a competition brews between them and bubbles over while on a field trip to a museum--which becomes more dangerous than either could have imagined!