Alice, a young college student, receives mysterious messages from an unknown person. The messages progressively reveal intimate details about Alice's life, causing her increasing distress and prompting her to confront the stranger. As the tension escalates, Alice seeks support from her friend Kate. However, the arrival of a chilling message urging her to open the door intensifies the unsettling atmosphere. The story explores themes of paranoia and split identity, as Alice's encounter with the unknown takes her on a disturbing journey into the depths of her psyche.