About a week after the Wood family moved into Xaos House, their daughter Elli went missing during a power outage. Ellie's mother, Keirain, investigates and discovers strange symbols carved into the walls. After multiple paranormal experiences, she concludes that the house took Ellie. She discovers that a physicist and worshipper named John Fetherston, who is obsessed with finding an 11th dimension, built the house and carved Octane into the 10 steps leading up to the small room. In the end, Keirain must fight the oldest evil in the universe or risk losing her family's lives forever.