Charlie and Dustin's idyllic weekend getaway at their friend's serene countryside home takes a terrifying turn when a blood-spattered woman suddenly appears, stalking them with relentless determination. As this mysterious woman's sinister mind games escalate, Charlie is horrified to discover that the stalker is none other than her own sister, Lindy. Lindy's behavior becomes increasingly erratic and violent, and when Dustin attempts to confront her, the situation spirals into danger. The shocking truth behind Lindy's intentions slowly emerges, forcing Charlie into a desperate struggle for survival against someone she once loved. With every ounce of strength and resourcefulness, Charlie must navigate the chilling reality that sometimes the gravest threat can emerge from within one's own family.