Frankelda, a mysterious ghostwriter, tells tales of terror with the assistance of her grumpy enchanted book Herneval, primarily focused on children encountering supernatural entities such as gnomes, witches, sirens and the Coco collectively known as "Spooks", that rely on human fear to survive. Trapped in the consciousness of a sentient haunted house for 150 years, telling stories allows the two an opportunity to gradually regain their strength and make an escape plan, though with the obstacle of the house itself waking up.