Moonsilver / The Silver Thread (The Unicorn's Secret #1-2)

*Moonsilver* (Book 1)
Heart Trilby has no family. She lives a hard and lonely life in the dusty village of Ash Grove -- until she finds a scarred, skinny mare in the forest. Against the wishes of her guardian, mean-spirited Simon Pratt, Heart adopts the mare and names her Avamir. Heart is thrilled when she realizes Avamir is in foal. But when the colt is born weak and disfigured, Simon decides to sell Heart's beloved horses to be slaughtered by the town's soapmaker. Can Heart find a way to protect them -- and the only love she has ever known?

*The Silver Thread* (Book 2)
When her beloved Moonsilver, the unicorn, is nearly killed by a hunter's arrow, Heart sneaks back into her village to get help froth the healer, Ruth Oakes. But even greater danger awaits Heart and Moonsilver in Ash Grove. Rumors of Moonsilver's secret have reached the ears of the cruel Lord Dunraven. Once again Heart must flee, with Ruth's mysterious gift -- a silver thread -- to protect her and Moonsilver.