Marie Brennan 
Doppelganger Omnibus 
includes Warrior, Witch & Dancing the Warrior

For centuries, the witches of Starfall have served the people of the fourteen domains while keeping their own secrets close. No one outside their ranks knows their power comes from a ritual that divides each newborn daughter in two: the witch, infused with magic, and the doppelganger, a soulless shell that is soon destroyed.Not all of the doppelgangers are dead, though, and their battle to survive will plunge Starfall into crisis. So long as her doppelganger lives, a witch cannot control her magic. But there are secrets even the witches do not know, and the doppelgangers hold power of their own . . .This omnibus includes the novels from the novel duology Warrior and Witch, as well as the prequel novella "Dancing the Warrior."