When architectural historian Imogen Ashworth inherits a crumbling cliff-top estate in Cornwall, she discovers a family secret buried for generations: seven iron rings embedded in a hidden chapel floor. Seven women drowned across seven centuries. And a cryptic note from her dead great-aunt: "Seven is not enough. The rings are waiting."As Imogen investigates, she uncovers the truth-her family has maintained a dark covenant since the Black Death, sacrificing one woman every 150 years to bind something ancient in the deep water below the house. Now the entity is calling to her nine-year-old daughter, Clara, whispering through dreams, teaching her to breathe underwater.Imogen has three weeks before the covenant comes due. She can become the eighth sacrifice and end the curse forever-or risk everything to break seven centuries of binding and face what her ancestor imprisoned in 1348.Some inheritances are curses. Some curses demand blood. And some doors should never be opened.