On an isolated stretch of land 80 km outside of San Francisco sits the most haunted house in the world. Built by Sarah Winchester, heiress to the Winchester fortune, it’s a house that knows no end. Constructed in an incessant twenty-four-hours-a-day, seven-days-a-week mania for decades, it stands seven stories tall and contains hundreds of rooms. To the outsider, it looks like a monstrous monument to a disturbed woman’s madness. But, Sarah is not building for herself, for her niece, or for the brilliant Doctor Eric Price, whom she has summoned to the house. She is building a prison—an asylum for hundreds of vengeful ghosts—and the most terrifying among them have a score to settle with the Winchesters.