The opening titles set an eerie tone through ghostly white text and unsettling sounds that indicate this is a horror film. As the titles turn red, associated with danger, screaming and a chopping sound build suspense. The film then introduces the main character, a girl alone in her dimly lit home, through a close up that establishes her innocence before potential harm. Strange phone calls heighten the tension as the camera tracks her point of view and the environment emphasizes her isolation, with signs of being watched from outside and knives in the kitchen foreshadowing potential violence.