This narrative device serves two purposes. Firstly, it builds suspense. Secondly, and more importantly, it places the viewer in the position of a victim of gaslighting. In the film's third act, the revelation of the plot centers on manipulation. The narrative shift from supernatural haunting to psychological thriller mirrors the real-world experience of victims of domestic abuse, where the abuser manipulates the victim's sense of reality. The "Secret" in the title, therefore, is not just a plot twist, but the revelation of systematic manipulation.