The King's Demon — Louise Cooper

A young woman regains consciousness to find herself alone on a moorland road at dead of night, with no memory but for two facts. One: her name is Sefira. And two: she has committed murder. She is rescued by Grendon, a high official at the royal court, who recognizes the horror locked away in her damaged mind and offers her protection. But Grendon, too, has secrets, and an agenda of his own. He means to use Sefira as bait in a deadly game. For the supernatural power that lurks within her could topple a kingdom-if it can be controlled. And that is the greatest gamble of all...