Rosalie Blackwood’s wedding should have sealed her future, but instead it exposes a nightmare: Lucien, her mermaid fiancé, is cheating, and he was assigned to watch her blood, not love her. That blood awakens the forbidden House of Tides, where she frees Kael, a chained Siren with the answers to her family’s disappearance. Behind the stolen estate stand Aunt Beatrice and Seraphina Ashford, who forged records, bribed the Court, and set the marriage as bait. Now Rosalie is caught in the Black Reef Rite, racing to expose the scheme before Lucien, the Court, and Ashford strip away her blood, her house, and her name.