Mystic and Rider (The Twelve Houses, Book 1)

The Mystic woman Senneth, accompanied by a team of Shapeshifters and Riders, is sent by the king into the land of Gillengaria to investigate reports of retaliation against those who use magic and discovers a perilous region under the control of a fanatical cult out to purge Gillengaria of all magic users, in the first in a four-volume series.