Charmed Life (Chrestomanci, #1) by Diana Wynne Jones

A bewitching comic fantasy by a master of the supernatural

Cat doesn't mind living in the shadow of his sister, Gwendolen, the most promising young witch ever seen on Coven Street. But trouble starts brewing the moment the two orphans are summoned to live in Chrestomanci Castle. Frustrated that the witches of the castle refuse to acknowledge her talents, Gwendolen conjures up a scheme that could throw whole worlds out of whack.Cat doesn't mind living in the shadow of his sister, Gwendolen, the most promising witch ever seen on Coven Street. But trouble starts brewing the moment the two orphans are summoned to live in Chrestomanci Castle. Frustrated that the enchanter Chrestomanci refuses to acknowledge her talents, Gwendolen conjures up a scheme that could throw whole worlds out of whack.

"Altogether a delightful book." -- Times Literary Supplement.

"The concept is ingenious."-- The Horn Book.