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Six months into rebuilding her life, single mom Sarah is proposed to by Mark, a kind widower. Her heart, long dormant, finally warms as Mark proposes, surrounded by their hopeful children. But then, a terrifying premonition: a camping trip with Mark's daughter, Lily, turns deadly as Lily summons hordes of venomous spiders to kill Sarah and her son, Leo, coldly whispering, "No one gets to be Daddy's favorite but me and my real mom." Sarah gasps awake, back at the proposal, the chilling memory of venom and Lily' s malevolence still vivid. With a shudder, Sarah rejects Mark, baffling him and infuriating his family, who brand her cruel, while Lily's angelic facade cracks to reveal a glimpse of pure, icy fury. Lily, however, won't be deterred; she stalks Sarah, hacking Leo's smartwatch and staging a manipulative late-night scene that traps Sarah into letting her inside. The nightmare escalates when Lily kidnaps Leo from his after-school program, and Sarah discovers Mark's shocking history: all his previous girlfriends, and even his wife, died from mysterious "spider bites." Sarah' s confusion turns into a cold fury, realizing Mark isn't just oblivious but complicit, enabling his daughter's monstrous trail of victims. Lily' s voice, relayed by a tarantula-borne recorder, demands Sarah come alone to an abandoned quarry, threatening Leo with a spider attack. Knowing the police will only escalate the danger, Sarah races towards the quarry, ready to face the truth and fight for her son' s life.