Katy McLaughlin desires to work on her family's mountainside horse ranch, although her father insists she finish boarding school. Katy finds a mustang in the hills near her ranch. The headstrong 16 year old then sets her mind to tame a mustang and prove to her father she can run the ranch. But when tragedy happens, it will take all the love and strength the family can muster to restore hope.

Katherine Watson is a recent UCLA graduate hired to teach art history at the prestigious all-female Wellesley College, in 1953. Determined to confront the outdated mores of society and the institution that embraces them, Katherine inspires her traditional students, including Betty and Joan, to challenge the lives they are expected to lead.