Isadora, abused by the Sollow family, is secretly healer X and designer Sollow. Falsely accused of poisoning her foster brother, she is expelled. Summoned to treat dying Sebastian Nott, she discovers via her pendant that she is the lost Silverwood heiress, welcomed by three powerful brothers. She exposes Ophelia's theft and grows close to Sebastian. When the Sollows hire healer X, she reveals herself too late to save Lysander. Ophelia and Celestia fund Death Eaters to kill her, but Isadora defeats them with ancestral power. They are publicly ruined. At her homecoming, Sebastian proposes. She accepts, having family and love.
