It started with a letter. A letter that had been lost for a long time, waiting out half a century, stifling summer after cooling winter, in a forgotten postal bag in the dim attic of a nondescript house in Bermondsey. Edie Burchill and her mother have never been close, but when a long lost letter arrives one Sunday afternoon with the return address of Millderhurst Castle, Kent, printed on its envelope, Edie begins to suspect that her mother's emotional distance masks an old secret.