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.
It is 1943, and 11-year-old Dewey Kerrigan is traveling west on a train to live with her scientist father--but no one will tell her exactly where he is. When she reaches Los Alamos, New Mexico, she learns why: he's working on a top secret government program.