Isabel Fabro is twenty-two, drowning in her family's debts, and desperate enough to say yes when a stranger offers her everything—on one condition.Marry Arthur Lim. Survive two years. Disappear with her education funded and her future secured.Simple. Transactional. Safe.Until Isabel arrives at Villa Magdalena and discovers that Arthur's first wife never really left.Margarita Santos Lim built more than an empire before she died. She built a test: her clothes in the closets, her recipes in the kitchen, her voice on the intercom, her friends at the door. And her journal—hidden, waiting, addressed to whoever dared to take her place.The Second Wife's Handbook isn't a love story. Not at first. It's an education in power, performance, and the dangerous question of who you become when someone else writes the rules.Isabel didn't come to fall in love. She came to survive. But survival requires learning the house's secrets: why Arthur chose a village girl who looks like young Margarita, why their son hates Isabel on Some marriages are made in heaven. This one was engineered by a dead woman's last experiment—and the results will change everyone involved.