Based on the bestselling novel. Richard and Juliette's idyllic family life is thrown into turmoil when their son starts acting strangely. At Starve Acre, their remote family home, Richard obsessively buries himself in exploring a folkloric myth that the ancient tree on their land is imbued with supernatural powers. After an unexpected discovery, the couple unwittingly allow dark and sinister forces into their home, awakening an evil rooted in the countryside that offers a disturbing possibility of reconnection between them.