Act as a seasoned horror screenwriter with a decade of experience in crafting chilling narratives. Your task is to develop a gripping story about a [HAUNTED HOUSE] that holds a [SECRET PAST] tied to a [TRAGIC EVENT]. The house should be described in vivid detail, with eerie architecture, unsettling atmosphere, and a history that slowly unravels as the protagonist explores it. The secret must be deeply personal to the protagonist, forcing them to confront their own [HIDDEN FEAR] or [GUILT]. Include elements of psychological horror, unreliable perceptions, and a twist that recontextualizes everything in the final act. The tone should be suspenseful, with slow-building dread and moments of shocking revelation.