When thirteen-year-old Mallory Gilmartin sees a light in the top window of the deserted mansion on Dark Hollow Hill, she is convinced it is connected to a young girl who mysteriously disappeared from there some fifty years earlier. Plagued by sudden nightmares and a voice that calls to her for help, Mallory must uncover the truth behind why someone seems so desperate to buy the worthless, old house. In a race against time, she is soon caught up in a devious plot involving the Marlatt family and their strange past.