When Isabella Lancaster discovers her husband's eight-month affair with a pregnant mistress, her world crumbles. Enter Alexander Cross, a powerful billionaire CEO who's been betrayed by the same woman. Together, they devise a revenge plan - fake a relationship to torment their exes. But as their pretend romance heats up Manhattan's social scene, the line between revenge and real feelings starts to blur. When a shocking paternity secret threatens to destroy everything, Isabella must choose between protecting the man she's falling for or saving herself from a devastating truth that could ruin them both.