Amazon.com Product Description (ISBN 006447268X, Paperback)

In this multiple parallel universes of the Twelve Related Worlds, only an enchanter with nine lives is powerful enough to control the rampant misuse of magic--and to hold the title Chrestomanci...

The Chants are a family strong in magic, but neither Christopher Chant nor Cat Chant can work even the simplest of spells. Who could have dreamed that both Christopher and Cat were born with nine lives--or that they could lose them so quickly?

Amazon.com Book Description (ISBN 0333214269, Hardcover)

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.