The first book in Kazu Kibuishi's #1 New York Times bestselling
series that features a beautiful but dangerous world of new friends,
giant robots, and shadowy enemies!
After the tragic death of their father, Emily and Navin move with their
mother to the home of her deceased great-grandfather. The strange house
proves to be dangerous. Before long, a tentacled creature lures the
kids' mom through a door in the basement. Em and Navin, desperate not to
lose her, follow her into a fantastical world inhabited by robots,
mysterious plants, and talking animals. It's up to Em and Navin to
figure out how to set things right and save their mother's life!