After the Woods family moved into Xaos House, their daughter Ellie went missing during a power cut. Ellie's mother Keira began to investigate and discovered that the walls of the house had strange symbols etched into them. After experiencing several terrifying supernatural events, she came to the conclusion that the house was possessed by an entity. She found a physicist and occultist named John Fetherston, who was obsessed with finding the 11th dimension, responsible for building the house and engraving sinister equations on the steps leading into the basement. Keira must confront the universe's most ancient evil or risk losing her family's souls forever.