When foundling Heart Avamir rescues a scarred, malnourished mare she finds in the forest, her life is changed forever - especially after the mare gives birth to a foal that turns out to be a unicorn. To protect the mare and her magical foal, Heart must leave her village and embark on a quest that will not only reveal the unicorn's secret, but raise tantalizing mysteries about Heart's own history.

Originally published as separate volumes, Moonsilver and The silver thread, 2001; The silver bracelet and The mountains of the moon, 2002.