The plot of the film, which is in early development, is being kept under wraps, though Riley Sager’s book is centered on a young woman, Maggie, whose family fled their Victorian home 25 years earlier in an event that inspired her father to pen a best-selling nonfiction book claiming they experienced a haunting. Maggie, now an adult, doesn’t remember those events and doesn’t believe her father’s book. But when she inherits the old family home after her father’s death, she starts to question if there’s more to the house than she believed.