The Demon Under the Mountain tells the story of Shay Manheim, a young woman living on a remote imperial colony, a newly discovered island at the edge of the world.

Shortly after her mother’s departure for the mainland, the wildlife becomes infected with a strange madness, leading to the death of her father and little brother. With the aid of an infernal demon tied to her bloodline, Shay tries to uncover the mysteries of Ingwald’s Island – the scheming of foreign Knights, frothing Mudbeasts, and vomiting Wizards.