The Dragon's Poison Queen

Seraphina Sterling is poisoned by her husband, Adrian Lockwood, and half-sister, Celeste Sterling. She makes a pact with Malakor for vengeance. Seraphina exposes Celeste's plagiarism, seizes Adrian's ledger, and allies with the Crown Prince to bring down the Third Prince. She reclaims family businesses and avenges her father. She helps Malakor break his seal, fulfilling their agreement.