Alice and Josh are a couple undergoing a tense separation. Alice decides to sell their home, hosting an open house to attract potential buyers. During the event, a sinister couple, David and Lila, secretly hide in the basement, unbeknownst to Alice. After the event concludes, David and Lila emerge, killing a potential buyer and taking Alice hostage. As Josh becomes worried about Alice's sudden disappearance, he returns to the house, only to fall into the sinister couple's trap. Meanwhile, Alice tries to find ways to escape her captors, who appear to have disturbing motives behind their actions.

David and Lila's relationship begins to fracture under the pressure of hiding their captives and maintaining their facade. Their dynamic becomes increasingly unstable, leading to violent confrontations. Alice, desperate for her freedom, discovers hidden depths of courage and resourcefulness as she attempts to outwit her captors. Tension builds as the true extent of David and Lila’s malevolence is revealed, creating a suspenseful atmosphere. The story follows a nail-biting course as Alice navigates the terror within her own home, seeking any opportunity to break free from the clutches of her captors and survive the ordeal.