In a quiet suburban neighborhood, a devoted wife and mother named Terri is home with her young children when a charming stranger named Colin shows up at her door during a stormy night. Claiming to have car trouble and asking for help, Colin seems polite but increasingly unsettling. Despite her initial hesitation, Terri allows him inside, unwittingly inviting danger into her home. Colin’s true motives are revealed when he exhibits violent behavior, throwing Terri and her children into a perilous situation.

As the night progresses, tension escalates as Terri endeavors to protect her family and outsmart Colin. The intruder's true identity and intentions slowly come to light, building a suspenseful narrative of cat-and-mouse. Terri must summon all her strength and resourcefulness to fight for survival and ensure the safety of her children against the looming threat within her own walls. The film intensifies with psychological and physical confrontations, leading to a dramatic and high-stakes climax.