Twelve houses, book 5: Fortune and Fate
Sharon Shinn2008

For the Rider Wen, peace in Gillengaria has only brought despair. Plagued by guilt for failing to protect her king, Wen has fled the royal city and given herself the penance of a life of wandering, helping strangers in need, making sure they remain just that: strangers.
Until the day she helps a terrified young woman abducted by an overeager suitor. The girl, she discovers, is the daughter of one of those who rose against the dead king, and is now heir to the great estate known as Fortune. Once she has delivered her safely home, Wen wants nothing further to do with the girl or her family.
But fate has other plans...For behind the walls of Fortune, Wen will find her future - and she will finally confront the ghosts of her past.