Mildred returns to Ms. Cackle's academy with the hopes of a better year; but when her summer holiday project is stolen she has to prove she didn't make it up. Meanwhile, a group of first years discover a secret in a tree. Plus a discovery in the school's ruins spells hope and trouble for everyone.

　　Mildred begins the new school term bursting with confidence. Her skills are tested when she attempts to win a flying competition with a very special prize.

　　When a botched potions experiment leaves Mildred with a whole new look, can she complete three impossible challenges and reverse the spell before the sun goes down?

米尔德丽德满怀自信地开启了新学期。她参加了一场飞行比赛，并获得了一个非常特别的奖品，这考验了她的飞行技能。