Raised in a mansion deep in the woods and kept isolated by her true crime-obsessed parents, Dahlia Lighthouse is unable to move beyond the disappearance of her twin brother, Andy, when they were sixteen. Following her fathera�TMs death, the family makes a gruesome discovery: buried in their fathera�TMs plot is another body a�" Andya�TMs. Dahliaa�TMs brother, Charlie, pours his energy into creating a family memorial museum; her sister, Tate, forges ahead with dioramas portraying crime scenes; and their mother affects a cheerful facade. As Dahlia grapples with her own grief, she realizes her eccentric family, and the mansion itself, may hold the answers to what happened to her twin.