Laura Ruby is the author of books including the fairy-tale inflected award-winner Bone Gap, the York trilogy, a steampunk series for younger readers, and her latest Thirteen Doorways, Wolves Behind Them All, a ranging, layered historical tale told by a ghost who can't stop tangling with the living.  She watches over Frankie, a girl consigned to an orphanage in World War II era Chicago in a story of heartache and survival that mixes worlds both haunted and achingly real. We talked to Ruby about what shaped her as a writer and her new book — recently named as a finalist for the National Book Award for Young People's Literature.