Lexi Murdoch, a resilient 18-year-old aging out of foster care, seizes a live-in nanny job with the wealthy Sterling family—Daniel, a charming pilot, Chelsea, a guarded corporate recruiter, and their infant son, Beau—hoping for stability and the chance to belong to a “real” family. But beneath the polished surface of their idyllic life, Lexi soon discovers unsettling cracks: Chelsea’s icy mistrust, Daniel’s growing fixation on her, and the couple’s volatile marriage pulling her into their toxic orbit. As secrets unravel and tensions escalate, Lexi realizes that the perfect life she thought she’d found may be far more dangerous than the one she left behind.