Hank Hudson doesn't stand out in drab Great Depression America. The middle child has always gone unseen and ignored, even before the stock market crashed. When his parents have to move the family cross-country, it's no surprise that they accidentally leave him behind.

Seven decades before the invention of cell phones, Hank has to make a choice: stay put and starve or find his family. As he sets off with his best friend Dog on a long journey, he stumbles into a hidden world filled with mystical power, mysterious people, and buried...