Book of a Thousand Days

Book of a Thousand Days
Shannon Hale
Fifteen-year-old Dashti, sworn to obey her sixteen-year-old mistress, the Lady Saren, shares Saren's years of punishment locked in a tower, then brings her safely to the lands of her true love, where both must hide who they are as they work as kitchen maids.
(Novelist) (Multnomah County Library)