Amazon.com Product Description (ISBN 0446616974, Mass Market Paperback)

When a witch is born, a doppelganger is created. For the witchto master her powers, the twin must be killed. Until now...Created by the merging of witch and doppelganger, Mirei is a unique being.Her extraordinary magic makes her the most powerful witch alive--and anotorious social outcast. While Satomi, the leader of the witches' rulingPrimes, hails Mirei as a miracle, rival Primes proclaim that Mirei is anevil abomination...and that those who champion her must be destroyed. Nowthe different factions of witches engage in a bloody war with magic,treachery, and murder. But both sides may be fighting for nothing. For thepower that the rebel Primes fear, the magic that Mirei alone possesses, iskilling her.