Orphaned at age six and taken in by a heartless couple, nine-year-old Katie Rose spends her days doing chores and dreaming of going West to find her Uncle Jack. Then Mr. Stevens brings home an unbroken mustang, and Katie's world changes. Katie is drawn to the horse's wildness, and he seems to sense her need for companionship. When Katie learns that the Stevenses plan to join the expansion West, without her or the mustang, she makes a desperate decision...

Katie is a very unhappy orphan working hard on the Stevenses' farm and then she becomes friends with a Mustang and they develop a bond.

Reaching Oregon, Katie's dream of reuniting with her uncle and returning her horse to his homeland and freedom is about to come true for one of them.

Katie is a very unhappy orphan working hard on the Stevenses' farm and then she becomes friends with a Mustang and they develop a bond.

While her father is away fighting the Normans and other Irish clans, nine-year-old Lara works hard to help harvest food and also cares for the pregnant gray mare that she loves.

After returning home with her horse from Connemara, Lara now feels that her old life has anything to offer, so she tries to find another place for herself and her horse which is safe from the warring clans.