Duey, Kathleen

In the Colorado Territory in 1875, orphan Margret and her older sister Libby stay with Mrs. Fredrickson and nurse an injured horse back to health.

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.

Heart sneaks back into her village when her beloved unicorn Moonsilver is injured by a hunter's arrow, seeking help from the healer Ruth Oakes, but she is forced to flee again when she learns the cruel Lord Dunraven knows about the unicorn's existence, with only the gift of Ruth's silver thread for help.

A lonely young girl named Heart finds companionship at last when she discovers a pregnant mare in the forest, but she has a fight on her hands when her mean-spirited guardian decides to have the mare and her disfigured foal slaughtered by the town soap maker.