Written for readers who have finished Book 1.
Number twelve, Bethnal Green, is the home Edie is sent away from — a mid-terrace house on a close-packed East-End street, with its Saturday market and its neighbours and its front-door key on a hook in the kitchen. It is the place the whole war is measured against: the home in Edie's head, kept whole in memory and letters while she is far away, and the thing her key is for.