"It Lives in a Cave in the Woods" is a dark fantasy period drama that tells the story of a young woman, Mable, who discovers that the monsters from childhood fairytales pale in comparison to the ones inside of us. After her father leaves mysteriously, Mable ponders a folktale he used to tell her as a child about a beast that lives in a cave in the woods. As memories of her father haunt her and tensions rise between her and her mother, defiance and curiosity grows inside of Mable until she stumbles upon an answer she wishes she hadn't.