Katie once left her parent's horse ranch behind her. Now, when her father is sick Katie has to return to the farm. She meets Cass, now a grown man whom she had a crush on as a kid.

As America's stock of athletic young men is depleted during World War II, a professional all-female baseball league springs up in the Midwest, funded by publicity-hungry candy maker Walter Harvey. Competitive sisters Dottie Hinson and Kit Keller spar with each other, scout Ernie Capadino and grumpy has-been coach Jimmy Dugan on their way to fame.