Fourteen-year-old Billy Dilley is a super quirky, science-loving 7th grader on the adventure of a lifetime. When his science fair project goes horribly wrong, Billy and his two lab partners, Zeke and Marsha, find themselves stranded in a mysterious world in the middle of Earth called Subterranea-Tania. Despite the wild dangers this new world throws his way, Billy will go anywhere and do anything to satisfy his never-ending curiosity.