Dark moon defender
(Book)

"A novel of the Twelve Houses"--Cover.

In this story of hidden magic and forbidden love, the King's Rider Justin befriends Ellynor, a young novice at a convent-only to discover that she is a mystic being manipulated by the fanatical Daughters of the Pale Moon into hunting down and killing other mystics. -- from Amazon.

The King's Rider, Justin, has been dispatched to watch any suspicious activity at the convent that houses the fanatical Daughters of the Pale Mother. Worshipers of the moon goddess, they believe all magic-wielding mystics are evil. Yet, in their midst, a young novice named Ellynor possesses the gift of healing and the ability to move through the night unobserved. Assuming the guise of a stablehand, Justin befriends Ellynor--and love blossoms between them. And when he discovers her magical talents, Justin will risk everything--his own secret, the trust of his friends, even his very life--in order to save her ...