James and Amy are a common couple who live at 388 Arletta Avenue. Out of the blue, a mysterious stalker sneaks in their home and bugs it with microphones and cameras positioned in order to cover the whole house. When Amy vanishes and leaves a handwritten letter to James, he suspects that someone has broken in his home. He calls the police, but the police officer does not give credit to him. Weird things happen in the house and James becomes paranoid without realizing that his movements are seen by the stalker. His obsession to discover what might have happened to Amy leads the family to a tragic end.