On the weekend of her wedding, Clare Hobbes meets an elderly woman named Edith Herron. During the course of a single conversation, Edith gives Clare the courage to do what she should have done months earlier: break off her engagement to her charming, yet overly possessive, fiancé. Three weeks later, Clare learns that Edith has died - and has given her another gift. Nestled in crepe myrtle and hydrangea and perched at the marshy edge of a bay in a small seaside town in Delaware, Blue Sky House now belongs to Clare. Though the former guest house has been empty for years, Clare feels a deep connection to Edith inside its walls, which are decorated with old photographs taken by Edith and her beloved husband, Joseph. Exploring the house, Clare finds two mysterious ledgers hidden beneath the kitchen sink. Edith, it seems, was no ordinary woman - and Blue Sky House no ordinary place.