La estrella de la novela gráfica Kazu Kibuishi crea un tétrico mundo de fantasía en el que dos niños normales tendrán una misión de vida o muerte.
La familia de Emily se muda para rehacer su vida tras un accidente. Pero los secretos de la tétrica mansión salen a la luz durante la primera noche. Cuando una criatura con tentáculos secuestra a su madre, Emily y su  hermano Navin deben sortear misterios y enfrentarse a grandes peligros para evitar perder a quien más quieren.
ENGLISH DESCRIPTION
Graphic novel star Kazu Kibuishi creates a world of terrible, man-eating demons, a mechanical rabbit, a talking fox, a giant robot —and two ordinary children on a mission.
After the tragic death of their father, Emily and Navin move with their mother to the home of her deceased great-grandfather, but the strange house proves to be dangerous. Before long, a sinister creature lures the kids' mom through a door in the basement. Em and Navin, desperate not to lose her, follow her into an underground world inhabited by demons, robots, and talking animals.
Eventually, they enlist the help of a small mechanical rabbit named Miskit. Together with Miskit, they face the most terrifying monster of all, and Em finally has the chance to save someone she loves.