Elara Finch, a quiet rare book restorer, is forced to undergo full facial and bodily plastic surgery by a mysterious Consultant after her grandmother is kidnapped as leverage. She is made an identical double of Caterina Colleone, the hidden heir of New York’s powerful Colleone mafia, and imprisoned in the family estate to act as a puppet mob boss. Constantly monitored and suspected by Luca Ross, the family’s cold underboss, Elara secretly gathers clues, finds Caterina’s private journal and uncovers the Consultant’s murderous scheme to kill the real Caterina and seize the family power. At a core gang meeting, she exposes the whole plot, frees the surviving true heir, rejects all mafia authority, and returns to her peaceful life restoring ancient books, keeping a firm emotional distance from Luca.