Griffith, Graham, and Ruby's father passed away in the war. And now they must join their mother and their father's wartime traveling baseball team, The Travelin' Nine, on a tour of America to raise money. No one will tell the kids why the team needs money so badly. Their only clue is a baseball with a hole the size of an acorn in it that their Uncle Owen gave to them the night of their father's funeral. They know very little about its significance...