Inkdeath by Cornelia Funke

The story begins with Farid working for Orpheus, in hopes of him reading Dustfinger back to life, and Meggie and her parents living with the Black Prince and his gang of robbers. However, the key to bringing Dustfinger back is communicating with the White Women themselves, and so far Orpheus does not have any knowledge as to how to meet them. Knowing that Mo has the power to summon up the White Women, Orpheus offers him the return trip to the real world his wife and daughter, and demands a meeting with the White Women.