She doesn't know who she is, and doesn't know why she's invisibly floating through the buildings and grounds of a half-remembered boarding school. Then, to her horror, she encounters the ancient evil that four peculiar sisters have unwittingly woken -- and learns she is their only hope against a deadly danger.
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.
In a career spanning four decades, award-winning author Diana Wynne Jones (1934‒2011) wrote more than forty books of fantasy for young readers. Characterized by magic, multiple universes, witches and wizards—and a charismatic nine-lived enchanter—her books are filled with unlimited imagination, dazzling plots, and an effervescent sense of humor that earned her legendary status in the world of fantasy.