In 1957, inspired by what she is learning about civil rights and armed with knowledge of female ball players, ten-year-old Katy Gordon fights to be allowed to play Little League baseball.
"Jack and Annie use the magic tree house to travel back in time to 1947 Brooklyn, New York, where they pretend to be batboys at Jackie Robinson's first game with the Brooklyn Dodgers against the Boston Braves"--
In 1959 Bernard is a young Red Sox fan, troubled by the lack of Black players in major league baseball, especially as there are none at all on his favorite team--but change is coming in the form of a rookie named Pumpsie Green.