Eden Fox, an artist on the brink of her big break, sets off for a run before her first exhibition. When she returns to the home she recently moved into - Spyglass, an enchanting old house in Hope Falls - nothing is as it should be. Her key doesn't fit. A woman, eerily similar to her, answers the door. And her husband insists that this stranger is his wife. One house. One husband. Two women. Someone is lying. Six months earlier, a reclusive Londoner named Birdy, reeling from a life-changing diagnosis, inherits Spyglass. This unexpected gift from a long-lost grandmother brings her to the pretty seaside village of Hope Falls. But then Birdy stumbles upon a shadowy London clinic that claims to be able to predict a person's date of death, including her own.