Melanie "Mel" Roberts and Ray Halfmoon may be from different Indigenous Nations, but the friends have become like siblings since the Robertses moved in with the Halfmoons. And they soon welcome a distinguished guest: Great-grandfather Bat, whose wing is injured, has taken refuge in their old oak tree. A rematch of the legendary Great Ball Game is coming up, with Bat as the star player. Grampa Charlie Halfmoon offers to drive Bat from Chicago down to the traditional playing field outside Macon, Georgia, and Mel and Ray are determined to help out. Together, they all set off on a road trip, facing adventure, danger, and a hair-raising mystery, on the way to the historic game.