Orphaned nine-year-old Katie Rose is sent to live with the Stevenses, and her backbreaking toil is eased by the relationship she develops with a mustang Mr. Stevens brings home.

Katie sets off for Oregon with Hiram, the farmhand, and the Mustang in the dead of night.

With the end of the journey in sight at last, Katie can't help but wonder what new experiences Oregon has in store for her and her beloved Mustang.

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.

Lara, the daughter of an Irish chieftain who, along with her horse, was captured by a rival clan and traded to the Norman invaders, finds purpose training nuns to breed horses.

In 1773, twelve-year-old Silence works to please her mother through household chores and weekly etiquette lessons in hopes of spending time with her beloved horse, Lily, while the men of Boston discuss a possible war.