Fifteen-year-old Jonah is an orphan, failing at school and tormented by the school bully. A Goblin wakes him up in the middle of the night and steals his opal pendant then disappears through a magical portal. On his journey to find the goblin, he finds himself in Godenow, the steampunk world within the Earth, where he battles mechanical creatures and rides steamers. He must pick his friends wisely so he can survive.
