Every Heart a Doorway by Seanan McGuire

Children have always disappeared under the right conditions; slipping through the shadows under a bed or at the back of a wardrobe, tumbling down rabbit holes and into old wells, and emerging somewhere… else. But magical lands have little need for used-up miracle children.

Nancy tumbled once, but now she’s back. The things she’s experienced… they change a person. The children under Miss West’s care understand all too well. But Nancy’s arrival marks a change at the Home… Read more.