一个小男孩和他的家人搬进了一个闹鬼的房子，在那里他遇到了三只可爱的幽灵小狗，并试图帮助它们变回真正的狗。

　　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.