The Unseen /
Zilpha Keatley Snyder.
- New York : Dell Yearling, [2005], c2004.
- 199 p. ; 20 cm.
Feeling angry and out-of-place in her large family, twelve-year-old Xandra finds a magical key to a world of ghostly, sometimes frightening, phantoms that help her see herself and her siblings more clearly.