Libros de Diana Wynne Jones (2 libros)

A ghost, uncertain of her identity, watches the four Melford sisters hatch a plan to get their parents' attention and slowly becomes aware of the danger from a supernatural power unleashed by the girls and their friends from the boys boarding school run by the Melfords.

Although an orphan, Earwig has always enjoyed living at San Morwald's, where she manages to make everyone do her bidding, but when she is taken in by a foster parents who are actually a witch and a demon, she has a hard time trying to turn the situation to her advantage.